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"/wiki/operator/op-3d-xid8-xid8/?v=13", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=13", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=13", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=13", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=13", "text": "xid8"}, "result_type": "int8"}], 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{"url": "/zh/docs/13/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "13", "build_id": 66, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "a0195016f729f1cf7c03c7c1344f2a62ff6b78f9a4eb1f299eab7720fd80182c", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "snapshot:sha256:a13a825c39f0268ef1cfe9137e283e38d0da73b2d7894f0733c7b26372a4f6a4", "translated_from_revision": null}, "body_sha256": "53ed3af7a6ce4add0334c855df1b1de08ab2eb867bcb857814dc4b81772ced36", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em class=\"firstterm\">\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code class=\"type\">int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code class=\"literal\">int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code class=\"type\">int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code class=\"literal\">COLLATE</code>\u3001<code class=\"literal\">ASC</code>/<code class=\"literal\">DESC</code> \u548c/\u6216 <code class=\"literal\">NULLS FIRST</code>/<code class=\"literal\">NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/13/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "summary": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "version": "13", "link_map": {"/zh/docs/13/indexes-opclass.html": "/docs/13/indexes-opclass.html"}, "body_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/13/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "body_sha256": "e9593eb0831a02f61214a3439e7c5f15f69213e0add3af8ba6e2868e0988d241", "content_hash": "ed5c1f3fa9ddf30d2538d293afb550ff7a40257e7150b1f6a4e4d9aefad9b282", "source_database": "center", "source_revision": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "description": "equal", "family_slug": "family-hash-xid8_ops", "result_type": "bool", "sort_family": "", "operator_slug": "op-3d-xid8-xid8", "sort_family_slug": ""}], "signature": "hash/xid8_ops", "tables_zh": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=13", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=13", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=13", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=13", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=13", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=13", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=13", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "source_oid": "5032", "description": ["xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002"], "sections_zh": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "localization": {"status": "complete", "sources": [{"url": "/docs/13/catalog-pg-amop.html", "method": "same-major semantic node", "sha256": "344df36a802a949f2a1e178d6708bf07012cd0daff6368987f59cab3023d2853", "language": "zh", "matched_nodes": ["#CATALOG-PG-AMOP/p[2]/em[1]"]}, {"url": "/docs/13/indexes-opclass.html", "method": "same-major semantic node", "sha256": "000af3648471325f388091b478e7d22683ce58bd59f5f9463c09b36504a22d3d", "language": "zh", "matched_nodes": ["#INDEXES-OPCLASS/p[3]", "#INDEXES-OPCLASS/p[5]", "#INDEXES-OPCLASS/p[6]"]}], "language": "zh", "original_text": {"/versions/13/description/0": "Hash operator family containing 1 classes, 1 operator strategies and 2 support functions in this source build.", "/versions/13/facts/0/label": "Object kind", "/versions/13/facts/0/value": "Operator family", "/versions/13/facts/1/label": "Index AM", "/versions/13/tables/0/title": "Family operator strategies", "/versions/13/tables/1/title": "Family support functions", "/versions/13/tables/2/title": "Classes in this family", "/versions/13/related/0/label": "Hash Index AM", "/versions/13/sections/0/title": "Operator classes and families", "/versions/13/tables/0/rows/0/scope": "Family member", "/versions/13/sections/0/paragraphs/0": "An index definition can specify an operator class for each column of an index.", "/versions/13/sections/0/paragraphs/1": "The operator class identifies the operators to be used by the index for that column. For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).", "/versions/13/sections/0/paragraphs/2": "There are also some built-in operator classes besides the default ones:", "/versions/13/tables/0/rows/0/purpose": "search", "/versions/13/tables/2/rows/0/default": "yes", "/versions/13/tables/0/columns/0/label": "Operator overload", "/versions/13/tables/0/columns/1/label": "Strategy", "/versions/13/tables/0/columns/2/label": "Purpose", "/versions/13/tables/0/columns/3/label": "Ordering family", "/versions/13/tables/0/columns/4/label": "Membership scope", "/versions/13/tables/0/columns/5/label": "Source description", "/versions/13/tables/1/columns/0/label": "Support number", "/versions/13/tables/1/columns/1/label": "Left type", "/versions/13/tables/1/columns/2/label": "Right type", "/versions/13/tables/1/columns/3/label": "Function signature", "/versions/13/tables/1/columns/4/label": "Result type", "/versions/13/tables/2/columns/0/label": "Class", "/versions/13/tables/2/columns/1/label": "Input type", "/versions/13/tables/2/columns/2/label": "Key type", "/versions/13/tables/2/columns/3/label": "Default", "/versions/13/tables/2/rows/0/key_type": "Same as input type", "/versions/13/tables/0/rows/0/description": "equal"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "7405758a464b7ec578f87cef7592b79440751f37da5d385801be01c0f8fef6be", "canonical_center_text_hash": "ed5c1f3fa9ddf30d2538d293afb550ff7a40257e7150b1f6a4e4d9aefad9b282"}, "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "comparison_data": {"kind": "family", "classes": [{"name": "xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8"}], "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "sort_family": ""}], "attributes": {"name": "xid8_ops", "method": "hash"}, "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashint8(int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashint8extended(int8,int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int8"}]}, "comparison_hash": "d524518172fdebc6f8ef1290d24f3e8da1d6d6228b962fbdb44c2d698a2e6851", "manual_language": "zh", "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashint8(int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashint8extended(int8,int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int8"}], "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/13/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "14": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "family": {"name": "xid8_ops", "method": "hash"}, "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=14", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=14", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "aliases": ["xid8_ops", "hash/xid8_ops"], "classes": [{"name": "xid8_ops", "slug": "class-hash-xid8_ops", "family": "xid8_ops", "method": "hash", 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"zh-Hans", "version": "14", "build_id": 99, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "503c4861e6fb3e17851c6c632abd4dbe3987258ed746ad484a08f199d2add809", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:87e6aa4fd6e1ec85c5f4a6de4f5647cfd9e5de734ca2c266d32b6d6192c662ef", "translated_from_revision": null}, "body_sha256": "17e34965806e24ea61984f674f59fb1408b2d4c3bbde7a73cd8eb9dd2426af1d", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, "facts_zh": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "center_zh": {"title": "hash/xid8_ops (family)", "locale": "zh-Hans", "source": {"key": "family-hash-xid8_ops", "locale": "zh-Hans", "version": "14", "text_hash": "2f00fa82b3e070e4bf24876dacc7e543acd85cc7552d384f817e4fdaeee70c2a", "collection": "opclass", "dataset_hash": "7c31b524dfe136022d39a6ae8dcfac6b3bbd5f8fdaf422536599981252aff0c9", "source_database": "center", "source_revision": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, "payload": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=14", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=14", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/14/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "14", "build_id": 99, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "503c4861e6fb3e17851c6c632abd4dbe3987258ed746ad484a08f199d2add809", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:87e6aa4fd6e1ec85c5f4a6de4f5647cfd9e5de734ca2c266d32b6d6192c662ef", "translated_from_revision": null}, "body_sha256": "17e34965806e24ea61984f674f59fb1408b2d4c3bbde7a73cd8eb9dd2426af1d", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em class=\"firstterm\">\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code class=\"type\">int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code class=\"literal\">int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code class=\"type\">int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code class=\"literal\">COLLATE</code>\u3001<code class=\"literal\">ASC</code>/<code class=\"literal\">DESC</code> \u548c/\u6216 <code class=\"literal\">NULLS FIRST</code>/<code class=\"literal\">NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/14/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "summary": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "version": "14", "link_map": {"/zh/docs/14/indexes-opclass.html": "/docs/14/indexes-opclass.html"}, "body_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/14/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "body_sha256": "595ef6db04b8704ca5504a72e76f1ed0593ebbba0dc09a13da2143822359489d", "content_hash": "2f00fa82b3e070e4bf24876dacc7e543acd85cc7552d384f817e4fdaeee70c2a", "source_database": "center", "source_revision": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "description": "equal", "family_slug": "family-hash-xid8_ops", "result_type": "bool", "sort_family": "", "operator_slug": "op-3d-xid8-xid8", "sort_family_slug": ""}], "signature": "hash/xid8_ops", "tables_zh": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=14", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=14", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=14", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "source_oid": "5032", "description": ["xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002"], "sections_zh": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "localization": {"status": "complete", "sources": [{"url": "/docs/14/catalog-pg-amop.html", "method": "same-major semantic node", "sha256": "2b8fdc15654f6701ab77bdf068a2c3b50cadd8da3bce8f385811b4193b4952b4", "language": "zh", "matched_nodes": ["#CATALOG-PG-AMOP/p[2]/em[1]"]}, {"url": "/docs/14/indexes-opclass.html", "method": "same-major semantic node", "sha256": "4cb8380e551ee45907962594be66e8173948c404caa5f227b1672e5d298bd128", "language": "zh", "matched_nodes": ["#INDEXES-OPCLASS/p[3]", "#INDEXES-OPCLASS/p[5]", "#INDEXES-OPCLASS/p[6]"]}], "language": "zh", "original_text": {"/versions/14/description/0": "Hash operator family containing 1 classes, 1 operator strategies and 2 support functions in this source build.", "/versions/14/facts/0/label": "Object kind", "/versions/14/facts/0/value": "Operator family", "/versions/14/facts/1/label": "Index AM", "/versions/14/tables/0/title": "Family operator strategies", "/versions/14/tables/1/title": "Family support functions", "/versions/14/tables/2/title": "Classes in this family", "/versions/14/related/0/label": "Hash Index AM", "/versions/14/sections/0/title": "Operator classes and families", "/versions/14/tables/0/rows/0/scope": "Family member", "/versions/14/sections/0/paragraphs/0": "An index definition can specify an operator class for each column of an index.", "/versions/14/sections/0/paragraphs/1": "The operator class identifies the operators to be used by the index for that column. For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).", "/versions/14/sections/0/paragraphs/2": "There are also some built-in operator classes besides the default ones:", "/versions/14/tables/0/rows/0/purpose": "search", "/versions/14/tables/2/rows/0/default": "yes", "/versions/14/tables/0/columns/0/label": "Operator overload", "/versions/14/tables/0/columns/1/label": "Strategy", "/versions/14/tables/0/columns/2/label": "Purpose", "/versions/14/tables/0/columns/3/label": "Ordering family", "/versions/14/tables/0/columns/4/label": "Membership scope", "/versions/14/tables/0/columns/5/label": "Source description", "/versions/14/tables/1/columns/0/label": "Support number", "/versions/14/tables/1/columns/1/label": "Left type", "/versions/14/tables/1/columns/2/label": "Right type", "/versions/14/tables/1/columns/3/label": "Function signature", "/versions/14/tables/1/columns/4/label": "Result type", "/versions/14/tables/2/columns/0/label": "Class", "/versions/14/tables/2/columns/1/label": "Input type", "/versions/14/tables/2/columns/2/label": "Key type", "/versions/14/tables/2/columns/3/label": "Default", "/versions/14/tables/2/rows/0/key_type": "Same as input type", "/versions/14/tables/0/rows/0/description": "equal"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "cb55a5726d4b256f971996d6ea46b42b28dd9a8a51e7b33ca40824b7815e6f55", "canonical_center_text_hash": "2f00fa82b3e070e4bf24876dacc7e543acd85cc7552d384f817e4fdaeee70c2a"}, "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "comparison_data": {"kind": "family", "classes": [{"name": "xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8"}], "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "sort_family": ""}], "attributes": {"name": "xid8_ops", "method": "hash"}, "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashint8(int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashint8extended(int8,int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int8"}]}, "comparison_hash": "d524518172fdebc6f8ef1290d24f3e8da1d6d6228b962fbdb44c2d698a2e6851", "manual_language": "zh", "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashint8(int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashint8extended(int8,int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int8"}], "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/14/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "15": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "family": {"name": "xid8_ops", "method": "hash"}, "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=15", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=15", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "aliases": ["xid8_ops", "hash/xid8_ops"], "classes": [{"name": "xid8_ops", "slug": "class-hash-xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8", "source_oid": "", "family_slug": "family-hash-xid8_ops"}], "related": [{"url": "/wiki/indexam/hash/?v=15", "label": "Hash \u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "label": "15.19", "major": "15", "channel": "stable", "revision": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89", "source_sha256": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89", "manual_fingerprint": "f39c61e9facb5b9404c7d6d1cf494d83af0cc46146554a7fc40724eb882d24a9", "catalog_fingerprint": "1c332a5ccec7bfdd8ca19b55a0279b5bd6cb1dd5dcc6c5587a98a491a9b566a5"}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "label": "Matching PostgreSQL source archive", "sha256": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, {"url": "/docs/15/indexes-opclass.html", "path": "indexes-opclass.html", "label": "PostgreSQL 15 English manual: indexes-opclass.html", "sha256": "57685c0a60cb570754be680551a6947556a03b6ff16a4a511483bdcac143c6da"}, {"url": "/docs/15/catalog-pg-opfamily.html", "path": "catalog-pg-opfamily.html", "label": "PostgreSQL 15 English manual: catalog-pg-opfamily.html", "sha256": "f64fe11b448841cb4016489062de017e275de583a429b06c1824f545835ef300"}, {"url": "/docs/15/catalog-pg-amop.html", "path": "catalog-pg-amop.html", "label": "PostgreSQL 15 English manual: catalog-pg-amop.html", "sha256": "53ced8770f19710869151ab02a9a6f0d97380981ca4bfe83752092bfb74a9e0c"}, {"url": "/docs/15/catalog-pg-amproc.html", "path": "catalog-pg-amproc.html", "label": "PostgreSQL 15 English manual: catalog-pg-amproc.html", "sha256": "cdcce97c140ef4b73e0abc870c6a7f0d8ebda9f31d4c02b3f5444f50828d7f37"}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/15/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "15", "build_id": 101, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "5b72836e9b884335c4bec570b7b91e0389688f21b43f97a096ce39dbc50fcd50", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:6bce1a2df9170cb1146a1411c5547190856638221a6539e618ee1016c9f493ad", "translated_from_revision": null}, "body_sha256": "32f1565fef780f43e7c34ef710284e4c8a0f1245dfa4ace56670ed8d1d1fe8d7", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, "facts_zh": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "center_zh": {"title": "hash/xid8_ops (family)", "locale": "zh-Hans", "source": {"key": "family-hash-xid8_ops", "locale": "zh-Hans", "version": "15", "text_hash": "c5c6a022b21b8f8a3b52f0a5edf7068267bacb2950687c91095bc21a9c2ea42f", "collection": "opclass", "dataset_hash": "7c31b524dfe136022d39a6ae8dcfac6b3bbd5f8fdaf422536599981252aff0c9", "source_database": "center", "source_revision": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, "payload": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=15", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=15", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/15/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "15", "build_id": 101, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "5b72836e9b884335c4bec570b7b91e0389688f21b43f97a096ce39dbc50fcd50", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:6bce1a2df9170cb1146a1411c5547190856638221a6539e618ee1016c9f493ad", "translated_from_revision": null}, "body_sha256": "32f1565fef780f43e7c34ef710284e4c8a0f1245dfa4ace56670ed8d1d1fe8d7", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em class=\"firstterm\">\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code class=\"type\">int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code class=\"literal\">int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code class=\"type\">int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code class=\"literal\">COLLATE</code>\u3001<code class=\"literal\">ASC</code>/<code class=\"literal\">DESC</code> \u548c/\u6216 <code class=\"literal\">NULLS FIRST</code>/<code class=\"literal\">NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/15/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "summary": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "version": "15", "link_map": {"/zh/docs/15/indexes-opclass.html": "/docs/15/indexes-opclass.html"}, "body_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/15/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "body_sha256": "4949c3f399d7de5a33acfad7e13d5540de8b98679cdddd9964b749bffd3e8a54", "content_hash": "c5c6a022b21b8f8a3b52f0a5edf7068267bacb2950687c91095bc21a9c2ea42f", "source_database": "center", "source_revision": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "description": "equal", "family_slug": "family-hash-xid8_ops", "result_type": "bool", "sort_family": "", "operator_slug": "op-3d-xid8-xid8", "sort_family_slug": ""}], "signature": "hash/xid8_ops", "tables_zh": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=15", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=15", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=15", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "source_oid": "5032", "description": ["xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002"], "sections_zh": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "localization": {"status": "complete", "sources": [{"url": "/docs/15/catalog-pg-amop.html", "method": "same-major semantic node", "sha256": "722b907f43f8178f67214192f7587c04c86bbab3759c44150d611dead287836f", "language": "zh", "matched_nodes": ["#CATALOG-PG-AMOP/p[2]/em[1]"]}, {"url": "/docs/15/indexes-opclass.html", "method": "same-major semantic node", "sha256": "99e792c28f2215316661a351044aa90cd191477d266005d4849696ce85bb89ed", "language": "zh", "matched_nodes": ["#INDEXES-OPCLASS/p[3]", "#INDEXES-OPCLASS/p[5]", "#INDEXES-OPCLASS/p[6]"]}], "language": "zh", "original_text": {"/versions/15/description/0": "Hash operator family containing 1 classes, 1 operator strategies and 2 support functions in this source build.", "/versions/15/facts/0/label": "Object kind", "/versions/15/facts/0/value": "Operator family", "/versions/15/facts/1/label": "Index AM", "/versions/15/tables/0/title": "Family operator strategies", "/versions/15/tables/1/title": "Family support functions", "/versions/15/tables/2/title": "Classes in this family", "/versions/15/related/0/label": "Hash Index AM", "/versions/15/sections/0/title": "Operator classes and families", "/versions/15/tables/0/rows/0/scope": "Family member", "/versions/15/sections/0/paragraphs/0": "An index definition can specify an operator class for each column of an index.", "/versions/15/sections/0/paragraphs/1": "The operator class identifies the operators to be used by the index for that column. For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).", "/versions/15/sections/0/paragraphs/2": "There are also some built-in operator classes besides the default ones:", "/versions/15/tables/0/rows/0/purpose": "search", "/versions/15/tables/2/rows/0/default": "yes", "/versions/15/tables/0/columns/0/label": "Operator overload", "/versions/15/tables/0/columns/1/label": "Strategy", "/versions/15/tables/0/columns/2/label": "Purpose", "/versions/15/tables/0/columns/3/label": "Ordering family", "/versions/15/tables/0/columns/4/label": "Membership scope", "/versions/15/tables/0/columns/5/label": "Source description", "/versions/15/tables/1/columns/0/label": "Support number", "/versions/15/tables/1/columns/1/label": "Left type", "/versions/15/tables/1/columns/2/label": "Right type", "/versions/15/tables/1/columns/3/label": "Function signature", "/versions/15/tables/1/columns/4/label": "Result type", "/versions/15/tables/2/columns/0/label": "Class", "/versions/15/tables/2/columns/1/label": "Input type", "/versions/15/tables/2/columns/2/label": "Key type", "/versions/15/tables/2/columns/3/label": "Default", "/versions/15/tables/2/rows/0/key_type": "Same as input type", "/versions/15/tables/0/rows/0/description": "equal"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "dbd1a85df92bf4ffc8fb781fe77cc580eecd4de335b332c19c3da37b3d5b09d6", "canonical_center_text_hash": "c5c6a022b21b8f8a3b52f0a5edf7068267bacb2950687c91095bc21a9c2ea42f"}, "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "comparison_data": {"kind": "family", "classes": [{"name": "xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8"}], "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "sort_family": ""}], "attributes": {"name": "xid8_ops", "method": "hash"}, "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashint8(int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashint8extended(int8,int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int8"}]}, "comparison_hash": "d524518172fdebc6f8ef1290d24f3e8da1d6d6228b962fbdb44c2d698a2e6851", "manual_language": "zh", "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashint8(int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashint8extended(int8,int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int8"}], "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/15/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "16": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "family": {"name": "xid8_ops", "method": "hash"}, "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=16", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=16", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "aliases": ["xid8_ops", "hash/xid8_ops"], "classes": [{"name": "xid8_ops", "slug": "class-hash-xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8", "source_oid": "", "family_slug": "family-hash-xid8_ops"}], "related": [{"url": "/wiki/indexam/hash/?v=16", "label": "Hash \u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "label": "16.15", "major": "16", "channel": "stable", "revision": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed", "source_sha256": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed", "manual_fingerprint": "846fb006e9d590387203c1c65f671240bc5c30604c4e3084cf572817aacc19d0", "catalog_fingerprint": "70797d889dd8aeed77ae81092f99ab380e1109b54b0b7ca6fbf400e0a2111a70"}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "label": "Matching PostgreSQL source archive", "sha256": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, {"url": "/docs/16/indexes-opclass.html", "path": "indexes-opclass.html", "label": "PostgreSQL 16 English manual: indexes-opclass.html", "sha256": "a524c924c56d14615e7ea68aaaddd7c62abf7d153a0e291c191e0f4e962ffbae"}, {"url": "/docs/16/catalog-pg-opfamily.html", "path": "catalog-pg-opfamily.html", "label": "PostgreSQL 16 English manual: catalog-pg-opfamily.html", "sha256": "71b9139e78f463b6d1146ecc748e9142aedb70d82e003d27b43e95d9b6108b9d"}, {"url": "/docs/16/catalog-pg-amop.html", "path": "catalog-pg-amop.html", "label": "PostgreSQL 16 English manual: catalog-pg-amop.html", "sha256": "f580ac4a34d5f9d567834684e0c41b7df32a952e20a2fc11a9ce0964c2df7e9a"}, {"url": "/docs/16/catalog-pg-amproc.html", "path": "catalog-pg-amproc.html", "label": "PostgreSQL 16 English manual: catalog-pg-amproc.html", "sha256": "ce78e17af3e627c9f4a1b517d77b8eb2e071ba2e963f8b196bf9535ca98c388a"}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/16/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "16", "build_id": 103, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "995f7336b416c1d12be62a7bba561733a2c46a1cf7150e83016556887dbb439d", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:80579a071736780f9c4022bb5148e1fb1256f1a33591306af67816e9e9bf3a9b", "translated_from_revision": null}, "body_sha256": "e4a4b871963acf87ce9c2e936cbe10ec6a00c1ae6ceeae83c433c6f1fb465caf", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, "facts_zh": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "center_zh": {"title": "hash/xid8_ops (family)", "locale": "zh-Hans", "source": {"key": "family-hash-xid8_ops", "locale": "zh-Hans", "version": "16", "text_hash": "7967740a1f5a834429ce18601e83d498c306e780e445388d480d4857487692a6", "collection": "opclass", "dataset_hash": "7c31b524dfe136022d39a6ae8dcfac6b3bbd5f8fdaf422536599981252aff0c9", "source_database": "center", "source_revision": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, "payload": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=16", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=16", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/16/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "16", "build_id": 103, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "995f7336b416c1d12be62a7bba561733a2c46a1cf7150e83016556887dbb439d", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:80579a071736780f9c4022bb5148e1fb1256f1a33591306af67816e9e9bf3a9b", "translated_from_revision": null}, "body_sha256": "e4a4b871963acf87ce9c2e936cbe10ec6a00c1ae6ceeae83c433c6f1fb465caf", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em class=\"firstterm\">\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code class=\"type\">int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code class=\"literal\">int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code class=\"type\">int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code class=\"literal\">COLLATE</code>\u3001<code class=\"literal\">ASC</code>/<code class=\"literal\">DESC</code> \u548c/\u6216 <code class=\"literal\">NULLS FIRST</code>/<code class=\"literal\">NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/16/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "summary": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "version": "16", "link_map": {"/zh/docs/16/indexes-opclass.html": "/docs/16/indexes-opclass.html"}, "body_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/16/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "body_sha256": "1e82fe46bafde4c493eb917ebb4b1e22f57b445eb54e45f4e634200ddf404ec2", "content_hash": "7967740a1f5a834429ce18601e83d498c306e780e445388d480d4857487692a6", "source_database": "center", "source_revision": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "description": "equal", "family_slug": "family-hash-xid8_ops", "result_type": "bool", "sort_family": "", "operator_slug": "op-3d-xid8-xid8", "sort_family_slug": ""}], "signature": "hash/xid8_ops", "tables_zh": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=16", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=16", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=16", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "source_oid": "5032", "description": ["xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002"], "sections_zh": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "localization": {"status": "complete", "sources": [{"url": "/docs/16/catalog-pg-amop.html", "method": "same-major semantic node", "sha256": "704b1a6817cd451566b69b08f4210b2fb192934810322e22cb9a2980f7d93af4", "language": "zh", "matched_nodes": ["#CATALOG-PG-AMOP/p[2]/em[1]"]}, {"url": "/docs/16/indexes-opclass.html", "method": "same-major semantic node", "sha256": "da59bf9cb7d8a9ec0aeab1f5d3593429eec79ce6a1715eb47434832287159c3c", "language": "zh", "matched_nodes": ["#INDEXES-OPCLASS/p[3]", "#INDEXES-OPCLASS/p[5]", "#INDEXES-OPCLASS/p[6]"]}], "language": "zh", "original_text": {"/versions/16/description/0": "Hash operator family containing 1 classes, 1 operator strategies and 2 support functions in this source build.", "/versions/16/facts/0/label": "Object kind", "/versions/16/facts/0/value": "Operator family", "/versions/16/facts/1/label": "Index AM", "/versions/16/tables/0/title": "Family operator strategies", "/versions/16/tables/1/title": "Family support functions", "/versions/16/tables/2/title": "Classes in this family", "/versions/16/related/0/label": "Hash Index AM", "/versions/16/sections/0/title": "Operator classes and families", "/versions/16/tables/0/rows/0/scope": "Family member", "/versions/16/sections/0/paragraphs/0": "An index definition can specify an operator class for each column of an index.", "/versions/16/sections/0/paragraphs/1": "The operator class identifies the operators to be used by the index for that column. For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).", "/versions/16/sections/0/paragraphs/2": "There are also some built-in operator classes besides the default ones:", "/versions/16/tables/0/rows/0/purpose": "search", "/versions/16/tables/2/rows/0/default": "yes", "/versions/16/tables/0/columns/0/label": "Operator overload", "/versions/16/tables/0/columns/1/label": "Strategy", "/versions/16/tables/0/columns/2/label": "Purpose", "/versions/16/tables/0/columns/3/label": "Ordering family", "/versions/16/tables/0/columns/4/label": "Membership scope", "/versions/16/tables/0/columns/5/label": "Source description", "/versions/16/tables/1/columns/0/label": "Support number", "/versions/16/tables/1/columns/1/label": "Left type", "/versions/16/tables/1/columns/2/label": "Right type", "/versions/16/tables/1/columns/3/label": "Function signature", "/versions/16/tables/1/columns/4/label": "Result type", "/versions/16/tables/2/columns/0/label": "Class", "/versions/16/tables/2/columns/1/label": "Input type", "/versions/16/tables/2/columns/2/label": "Key type", "/versions/16/tables/2/columns/3/label": "Default", "/versions/16/tables/2/rows/0/key_type": "Same as input type", "/versions/16/tables/0/rows/0/description": "equal"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "a87e39cd6b8f174e88e15b7e82544f51e8f5739221b23fb6dba9b3b302a47056", "canonical_center_text_hash": "7967740a1f5a834429ce18601e83d498c306e780e445388d480d4857487692a6"}, "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "comparison_data": {"kind": "family", "classes": [{"name": "xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8"}], "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "sort_family": ""}], "attributes": {"name": "xid8_ops", "method": "hash"}, "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashint8(int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashint8extended(int8,int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int8"}]}, "comparison_hash": "d524518172fdebc6f8ef1290d24f3e8da1d6d6228b962fbdb44c2d698a2e6851", "manual_language": "zh", "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashint8(int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashint8extended(int8,int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int8"}], "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/16/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "17": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "family": {"name": "xid8_ops", "method": "hash"}, "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=17", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=17", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "aliases": ["xid8_ops", "hash/xid8_ops"], "classes": [{"name": "xid8_ops", "slug": "class-hash-xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8", "source_oid": "", "family_slug": "family-hash-xid8_ops"}], "related": [{"url": "/wiki/indexam/hash/?v=17", "label": "Hash \u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "label": "17.11", "major": "17", "channel": "stable", "revision": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979", "source_sha256": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979", "manual_fingerprint": "b55870f8e80e1114a92ac7bfc97f4a6fa0dee8e75935895252bb6e5b866cf187", "catalog_fingerprint": "e888e3474202df1c60a8e7b6bf9f2d83b3866a52d119521659b7a82787d3829d"}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "label": "Matching PostgreSQL source archive", "sha256": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, {"url": "/docs/17/indexes-opclass.html", "path": "indexes-opclass.html", "label": "PostgreSQL 17 English manual: indexes-opclass.html", "sha256": "dcdeb2d461b79e5c679d29f2a6d3ad038c788ba5a6d094e63d17353352db3ef2"}, {"url": "/docs/17/catalog-pg-opfamily.html", "path": "catalog-pg-opfamily.html", "label": "PostgreSQL 17 English manual: catalog-pg-opfamily.html", "sha256": "f7825b4e69f5073f44322085111577a0747a214b367c599e87491f75bc2a05ef"}, {"url": "/docs/17/catalog-pg-amop.html", "path": "catalog-pg-amop.html", "label": "PostgreSQL 17 English manual: catalog-pg-amop.html", "sha256": "19b2fb110b348860f7fbcb6e0e0544e341f5645113c23f50920a54434d432359"}, {"url": "/docs/17/catalog-pg-amproc.html", "path": "catalog-pg-amproc.html", "label": "PostgreSQL 17 English manual: catalog-pg-amproc.html", "sha256": "c1e9a6c78cb61e434eba6e22547c50a677d0c414049fd515263bec770b16ff55"}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/17/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "17", "build_id": 105, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "75e451363348ab54434776b1f03440b4f11a01c89d6014709e3211b8ad70ba7f", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:7340767258d21c21b36f373f1fff6bab2be18e0daca13a865129db6105c09efd", "translated_from_revision": null}, "body_sha256": "eefcfe34c1e02b4bb6544a6496187d3c7bf575b3e58cfbdfd2289345af936e9d", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, "facts_zh": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "center_zh": {"title": "hash/xid8_ops (family)", "locale": "zh-Hans", "source": {"key": "family-hash-xid8_ops", "locale": "zh-Hans", "version": "17", "text_hash": "00dbf9e83aea4853158e3119406e78ccfaf0c979a89cdda3bad7748d87591f05", "collection": "opclass", "dataset_hash": "7c31b524dfe136022d39a6ae8dcfac6b3bbd5f8fdaf422536599981252aff0c9", "source_database": "center", "source_revision": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, "payload": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=17", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=17", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/17/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "17", "build_id": 105, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "75e451363348ab54434776b1f03440b4f11a01c89d6014709e3211b8ad70ba7f", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:7340767258d21c21b36f373f1fff6bab2be18e0daca13a865129db6105c09efd", "translated_from_revision": null}, "body_sha256": "eefcfe34c1e02b4bb6544a6496187d3c7bf575b3e58cfbdfd2289345af936e9d", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em class=\"firstterm\">\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code class=\"type\">int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code class=\"literal\">int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code class=\"type\">int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code class=\"literal\">COLLATE</code>\u3001<code class=\"literal\">ASC</code>/<code class=\"literal\">DESC</code> \u548c/\u6216 <code class=\"literal\">NULLS FIRST</code>/<code class=\"literal\">NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/17/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "summary": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "version": "17", "link_map": {"/zh/docs/17/indexes-opclass.html": "/docs/17/indexes-opclass.html"}, "body_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/17/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "body_sha256": "169b63738ce4608927ec8d28bdcbaf129cb69d61f338c4dc7b4f55a05689703f", "content_hash": "00dbf9e83aea4853158e3119406e78ccfaf0c979a89cdda3bad7748d87591f05", "source_database": "center", "source_revision": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "description": "equal", "family_slug": "family-hash-xid8_ops", "result_type": "bool", "sort_family": "", "operator_slug": "op-3d-xid8-xid8", "sort_family_slug": ""}], "signature": "hash/xid8_ops", "tables_zh": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=17", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashint8(int8)", "left_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashint8extended(int8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=17", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=17", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "source_oid": "5032", "description": ["xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002"], "sections_zh": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "localization": {"status": "complete", "sources": [{"url": "/docs/17/catalog-pg-amop.html", "method": "same-major semantic node", "sha256": "79658772dd07ff10c4a4a472853e5a9bcba832796f5f9d2c0c77a87da769e5f6", "language": "zh", "matched_nodes": ["#CATALOG-PG-AMOP/p[2]/em[1]"]}, {"url": "/docs/17/indexes-opclass.html", "method": "same-major semantic node", "sha256": "66b33ea1fd240b6fae08ded914d718d50dfeba9d5be16dac835d0472b9cc9e4a", "language": "zh", "matched_nodes": ["#INDEXES-OPCLASS/p[3]", "#INDEXES-OPCLASS/p[5]", "#INDEXES-OPCLASS/p[6]"]}], "language": "zh", "original_text": {"/versions/17/description/0": "Hash operator family containing 1 classes, 1 operator strategies and 2 support functions in this source build.", "/versions/17/facts/0/label": "Object kind", "/versions/17/facts/0/value": "Operator family", "/versions/17/facts/1/label": "Index AM", "/versions/17/tables/0/title": "Family operator strategies", "/versions/17/tables/1/title": "Family support functions", "/versions/17/tables/2/title": "Classes in this family", "/versions/17/related/0/label": "Hash Index AM", "/versions/17/sections/0/title": "Operator classes and families", "/versions/17/tables/0/rows/0/scope": "Family member", "/versions/17/sections/0/paragraphs/0": "An index definition can specify an operator class for each column of an index.", "/versions/17/sections/0/paragraphs/1": "The operator class identifies the operators to be used by the index for that column. For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).", "/versions/17/sections/0/paragraphs/2": "There are also some built-in operator classes besides the default ones:", "/versions/17/tables/0/rows/0/purpose": "search", "/versions/17/tables/2/rows/0/default": "yes", "/versions/17/tables/0/columns/0/label": "Operator overload", "/versions/17/tables/0/columns/1/label": "Strategy", "/versions/17/tables/0/columns/2/label": "Purpose", "/versions/17/tables/0/columns/3/label": "Ordering family", "/versions/17/tables/0/columns/4/label": "Membership scope", "/versions/17/tables/0/columns/5/label": "Source description", "/versions/17/tables/1/columns/0/label": "Support number", "/versions/17/tables/1/columns/1/label": "Left type", "/versions/17/tables/1/columns/2/label": "Right type", "/versions/17/tables/1/columns/3/label": "Function signature", "/versions/17/tables/1/columns/4/label": "Result type", "/versions/17/tables/2/columns/0/label": "Class", "/versions/17/tables/2/columns/1/label": "Input type", "/versions/17/tables/2/columns/2/label": "Key type", "/versions/17/tables/2/columns/3/label": "Default", "/versions/17/tables/2/rows/0/key_type": "Same as input type", "/versions/17/tables/0/rows/0/description": "equal"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "e5907291d514e9ebc875dacdcb36822e1771f2341e591b6109efd43d1e346a47", "canonical_center_text_hash": "00dbf9e83aea4853158e3119406e78ccfaf0c979a89cdda3bad7748d87591f05"}, "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "comparison_data": {"kind": "family", "classes": [{"name": "xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8"}], "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "sort_family": ""}], "attributes": {"name": "xid8_ops", "method": "hash"}, "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashint8(int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashint8extended(int8,int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int8"}]}, "comparison_hash": "d524518172fdebc6f8ef1290d24f3e8da1d6d6228b962fbdb44c2d698a2e6851", "manual_language": "zh", "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashint8(int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashint8extended(int8,int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int8"}], "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashint8(int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashint8extended(int8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/17/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "18": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "family": {"name": "xid8_ops", "method": "hash"}, "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=18", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", 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"18", "build_id": 107, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "cce6c9b1d4fbb418823aa7be2585facae45f45a5f75c43bd26170c1383c2a4b5", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:08e987a66af27b98444a8057c256314eafa13611a3fb9e888214fc436824244b", "translated_from_revision": null}, "body_sha256": "660d8ee65a02daf5d80d4417a4bc152fbba91e3ec65cb8442e45e86f557ca5fb", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "facts_zh": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "center_zh": {"title": "hash/xid8_ops (family)", "locale": "zh-Hans", "source": {"key": "family-hash-xid8_ops", "locale": "zh-Hans", "version": "18", "text_hash": "91f1e10cca4b79c01c2b5d6841f155821a151e1a606c9789f12c2b957e9bbf7f", "collection": "opclass", "dataset_hash": "7c31b524dfe136022d39a6ae8dcfac6b3bbd5f8fdaf422536599981252aff0c9", "source_database": "center", "source_revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "payload": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=18", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=18", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/18/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "18", "build_id": 107, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "cce6c9b1d4fbb418823aa7be2585facae45f45a5f75c43bd26170c1383c2a4b5", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:08e987a66af27b98444a8057c256314eafa13611a3fb9e888214fc436824244b", "translated_from_revision": null}, "body_sha256": "660d8ee65a02daf5d80d4417a4bc152fbba91e3ec65cb8442e45e86f557ca5fb", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em class=\"firstterm\">\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code class=\"type\">int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code class=\"literal\">int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code class=\"type\">int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code class=\"literal\">COLLATE</code>\u3001<code class=\"literal\">ASC</code>/<code class=\"literal\">DESC</code> \u548c/\u6216 <code class=\"literal\">NULLS FIRST</code>/<code class=\"literal\">NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/18/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "summary": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "version": "18", "link_map": {"/zh/docs/18/indexes-opclass.html": "/docs/18/indexes-opclass.html"}, "body_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/18/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "body_sha256": "d55b5ec90414fe4bbc9d5d1f7c2f18f59fb90f25006957625c3c6decf2ca880d", "content_hash": "91f1e10cca4b79c01c2b5d6841f155821a151e1a606c9789f12c2b957e9bbf7f", "source_database": "center", "source_revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "description": "equal", "family_slug": "family-hash-xid8_ops", "result_type": "bool", "sort_family": "", "operator_slug": "op-3d-xid8-xid8", "sort_family_slug": ""}], "signature": "hash/xid8_ops", "tables_zh": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=18", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=18", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "source_oid": "5032", "description": ["xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002"], "sections_zh": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "localization": {"status": "complete", "sources": [{"url": "/docs/18/catalog-pg-amop.html", "method": "same-major semantic node", "sha256": "c46185aa5f574dacd289a0b3876023793406b4cf58dee7eeebb86436d0577bdc", "language": "zh", "matched_nodes": ["#CATALOG-PG-AMOP/p[2]/em[1]"]}, {"url": "/docs/18/indexes-opclass.html", "method": "same-major semantic node", "sha256": "d2d3789266054f227a79e8de0e96355c10b20598c2958745751fea464d457f8d", "language": "zh", "matched_nodes": ["#INDEXES-OPCLASS/p[3]", "#INDEXES-OPCLASS/p[5]", "#INDEXES-OPCLASS/p[6]"]}], "language": "zh", "original_text": {"/versions/18/description/0": "Hash operator family containing 1 classes, 1 operator strategies and 2 support functions in this source build.", "/versions/18/facts/0/label": "Object kind", "/versions/18/facts/0/value": "Operator family", "/versions/18/facts/1/label": "Index AM", "/versions/18/tables/0/title": "Family operator strategies", "/versions/18/tables/1/title": "Family support functions", "/versions/18/tables/2/title": "Classes in this family", "/versions/18/related/0/label": "Hash Index AM", "/versions/18/sections/0/title": "Operator classes and families", "/versions/18/tables/0/rows/0/scope": "Family member", "/versions/18/sections/0/paragraphs/0": "An index definition can specify an operator class for each column of an index.", "/versions/18/sections/0/paragraphs/1": "The operator class identifies the operators to be used by the index for that column. For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).", "/versions/18/sections/0/paragraphs/2": "There are also some built-in operator classes besides the default ones:", "/versions/18/tables/0/rows/0/purpose": "search", "/versions/18/tables/2/rows/0/default": "yes", "/versions/18/tables/0/columns/0/label": "Operator overload", "/versions/18/tables/0/columns/1/label": "Strategy", "/versions/18/tables/0/columns/2/label": "Purpose", "/versions/18/tables/0/columns/3/label": "Ordering family", "/versions/18/tables/0/columns/4/label": "Membership scope", "/versions/18/tables/0/columns/5/label": "Source description", "/versions/18/tables/1/columns/0/label": "Support number", "/versions/18/tables/1/columns/1/label": "Left type", "/versions/18/tables/1/columns/2/label": "Right type", "/versions/18/tables/1/columns/3/label": "Function signature", "/versions/18/tables/1/columns/4/label": "Result type", "/versions/18/tables/2/columns/0/label": "Class", "/versions/18/tables/2/columns/1/label": "Input type", "/versions/18/tables/2/columns/2/label": "Key type", "/versions/18/tables/2/columns/3/label": "Default", "/versions/18/tables/2/rows/0/key_type": "Same as input type", "/versions/18/tables/0/rows/0/description": "equal"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "14e2aeb27d2a997287ffbc93a2d7b44d5d179c4494804597d7363da08254c302", "canonical_center_text_hash": "91f1e10cca4b79c01c2b5d6841f155821a151e1a606c9789f12c2b957e9bbf7f"}, "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "comparison_data": {"kind": "family", "classes": [{"name": "xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8"}], "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "sort_family": ""}], "attributes": {"name": "xid8_ops", "method": "hash"}, "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashxid8(xid8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int8"}]}, "comparison_hash": "8029a807df0d56fd1f73ee124d2a27f05de6d2764192c1f09dab22170c4dd05e", "manual_language": "zh", "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashxid8(xid8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int8"}], "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/18/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "center_zh_rendered": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/docs/18/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "19": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "family": {"name": "xid8_ops", "method": "hash"}, "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=19", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=19", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "aliases": ["xid8_ops", "hash/xid8_ops"], "classes": [{"name": "xid8_ops", "slug": "class-hash-xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8", "source_oid": "", "family_slug": "family-hash-xid8_ops"}], "related": [{"url": "/wiki/indexam/hash/?v=19", "label": "Hash \u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v19rc1/postgresql-19rc1.tar.bz2", "label": "19rc1", "major": "19", "channel": "preview", "revision": "af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701", "source_sha256": "af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701", "manual_fingerprint": "63afc6091780ed5e52920ff9ef5adb6aa7dfcc82f8f413ed36ad46095788488d", "catalog_fingerprint": "da7a8a4e03b72cd120b91ffdff4265e065ccad9eab9964fc3eb1279a58464eb8"}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v19rc1/postgresql-19rc1.tar.bz2", "label": "Matching PostgreSQL source archive", "sha256": "af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701"}, {"url": "/docs/19/indexes-opclass.html", "path": "indexes-opclass.html", "label": "PostgreSQL 19 English manual: indexes-opclass.html", "sha256": "067b0ab52538156edc926c386cbdbd14038c2cf0b7da2333198643f531ca8fcf"}, {"url": "/docs/19/catalog-pg-opfamily.html", "path": "catalog-pg-opfamily.html", "label": "PostgreSQL 19 English manual: catalog-pg-opfamily.html", "sha256": "ad3b5d691bac66f3ea2068f7b58076634b4a61737a34c2484879f46554c880f7"}, {"url": "/docs/19/catalog-pg-amop.html", "path": "catalog-pg-amop.html", "label": "PostgreSQL 19 English manual: catalog-pg-amop.html", "sha256": "ff953e362a227387990b27226aff52dfd10f5f25b408d1bac8fa3e50bb45d00f"}, {"url": "/docs/19/catalog-pg-amproc.html", "path": "catalog-pg-amproc.html", "label": "PostgreSQL 19 English manual: catalog-pg-amproc.html", "sha256": "7a4705b9c5a0552c9232931179257747b96da8d195008bfc68304c53fc8be766"}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/19/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "19", "build_id": 109, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "9efd572f75ebc4499f3c73a8a6442fe2177a8511456f4a8a4a85ae2ae05951de", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "sha256:af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:65fda1f1b62a89992b84014c9157e61b67dbe8190e93945826efec668fad038c", "translated_from_revision": "sha256:af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701"}, "body_sha256": "bba0c6b1e413d6693322d6fa8a2af54cf6195117a6e04ee45ecc48d74485e952", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701"}, "facts_zh": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "center_zh": {"title": "hash/xid8_ops (family)", "locale": "zh-Hans", "source": {"key": "family-hash-xid8_ops", "locale": "zh-Hans", "version": "19", "text_hash": "77ead2342e93698b9be2b2a6fc731b85a8ae9efba3e9b31e12362a4c3e9dd199", "collection": "opclass", "dataset_hash": "7c31b524dfe136022d39a6ae8dcfac6b3bbd5f8fdaf422536599981252aff0c9", "source_database": "center", "source_revision": "af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701"}, "payload": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=19", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=19", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/19/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "19", "build_id": 109, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "9efd572f75ebc4499f3c73a8a6442fe2177a8511456f4a8a4a85ae2ae05951de", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "sha256:af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:65fda1f1b62a89992b84014c9157e61b67dbe8190e93945826efec668fad038c", "translated_from_revision": "sha256:af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701"}, "body_sha256": "bba0c6b1e413d6693322d6fa8a2af54cf6195117a6e04ee45ecc48d74485e952", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701"}, "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em class=\"firstterm\">\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code class=\"type\">int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code class=\"literal\">int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code class=\"type\">int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code class=\"literal\">COLLATE</code>\u3001<code class=\"literal\">ASC</code>/<code class=\"literal\">DESC</code> \u548c/\u6216 <code class=\"literal\">NULLS FIRST</code>/<code class=\"literal\">NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/19/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "summary": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "version": "19", "link_map": {"/zh/docs/19/indexes-opclass.html": "/docs/19/indexes-opclass.html"}, "body_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/19/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "body_sha256": "977339cb72782dbc5936052094429370ebd04c3d9c5b777454a58340d21145d0", "content_hash": "77ead2342e93698b9be2b2a6fc731b85a8ae9efba3e9b31e12362a4c3e9dd199", "source_database": "center", "source_revision": "af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701"}, "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "description": "equal", "family_slug": "family-hash-xid8_ops", "result_type": "bool", "sort_family": "", "operator_slug": "op-3d-xid8-xid8", "sort_family_slug": ""}], "signature": "hash/xid8_ops", "tables_zh": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=19", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=19", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=19", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "source_oid": "5032", "description": ["xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002"], "sections_zh": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "localization": {"status": "complete", "sources": [{"url": "/docs/19/catalog-pg-amop.html", "method": "same-major semantic node", "sha256": "8685135a1f22b71dfcd182e77ed97d14ceb21f011d1b58b2b168130423c68d5c", "language": "zh", "matched_nodes": ["#CATALOG-PG-AMOP/p[2]/em[1]"]}, {"url": "/docs/19/indexes-opclass.html", "method": "same-major semantic node", "sha256": "4b7641f1380b0a251d73741ec707584129005d66bc7a9e701ec660c45294044f", "language": "zh", "matched_nodes": ["#INDEXES-OPCLASS/p[3]", "#INDEXES-OPCLASS/p[5]", "#INDEXES-OPCLASS/p[6]"]}], "language": "zh", "original_text": {"/versions/19/description/0": "Hash operator family containing 1 classes, 1 operator strategies and 2 support functions in this source build.", "/versions/19/facts/0/label": "Object kind", "/versions/19/facts/0/value": "Operator family", "/versions/19/facts/1/label": "Index AM", "/versions/19/tables/0/title": "Family operator strategies", "/versions/19/tables/1/title": "Family support functions", "/versions/19/tables/2/title": "Classes in this family", "/versions/19/related/0/label": "Hash Index AM", "/versions/19/sections/0/title": "Operator classes and families", "/versions/19/tables/0/rows/0/scope": "Family member", "/versions/19/sections/0/paragraphs/0": "An index definition can specify an operator class for each column of an index.", "/versions/19/sections/0/paragraphs/1": "The operator class identifies the operators to be used by the index for that column. For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).", "/versions/19/sections/0/paragraphs/2": "There are also some built-in operator classes besides the default ones:", "/versions/19/tables/0/rows/0/purpose": "search", "/versions/19/tables/2/rows/0/default": "yes", "/versions/19/tables/0/columns/0/label": "Operator overload", "/versions/19/tables/0/columns/1/label": "Strategy", "/versions/19/tables/0/columns/2/label": "Purpose", "/versions/19/tables/0/columns/3/label": "Ordering family", "/versions/19/tables/0/columns/4/label": "Membership scope", "/versions/19/tables/0/columns/5/label": "Source description", "/versions/19/tables/1/columns/0/label": "Support number", "/versions/19/tables/1/columns/1/label": "Left type", "/versions/19/tables/1/columns/2/label": "Right type", "/versions/19/tables/1/columns/3/label": "Function signature", "/versions/19/tables/1/columns/4/label": "Result type", "/versions/19/tables/2/columns/0/label": "Class", "/versions/19/tables/2/columns/1/label": "Input type", "/versions/19/tables/2/columns/2/label": "Key type", "/versions/19/tables/2/columns/3/label": "Default", "/versions/19/tables/2/rows/0/key_type": "Same as input type", "/versions/19/tables/0/rows/0/description": "equal"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "0385a2526efc0528c9839154dd01b4a77347b3af5016006b2e63eb46efedbf59", "canonical_center_text_hash": "77ead2342e93698b9be2b2a6fc731b85a8ae9efba3e9b31e12362a4c3e9dd199"}, "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "comparison_data": {"kind": "family", "classes": [{"name": "xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8"}], "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "sort_family": ""}], "attributes": {"name": "xid8_ops", "method": "hash"}, "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashxid8(xid8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int8"}]}, "comparison_hash": "8029a807df0d56fd1f73ee124d2a27f05de6d2764192c1f09dab22170c4dd05e", "manual_language": "zh", "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashxid8(xid8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int8"}], "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/19/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "source_revalidation": {"kind": "static-same-version-source-and-manual-replay", "audit": "wiki-audit-20261023", "runtime_rerun": false, "compared_fields": "entity membership and source-derived facts; presentation markup normalized", "source_revision": "af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701", "previous_source_revision": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}}, "20": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "family": {"name": "xid8_ops", "method": "hash"}, "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=20", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=20", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "aliases": ["xid8_ops", "hash/xid8_ops"], "classes": [{"name": "xid8_ops", "slug": "class-hash-xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8", "source_oid": "", "family_slug": "family-hash-xid8_ops"}], "related": [{"url": "/wiki/indexam/hash/?v=20", "label": "Hash \u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5"}], "release": {"ref": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "label": "20devel", "major": "20", "channel": "devel", "revision": "49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac", "source_sha256": "49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac", "manual_fingerprint": "4afd3a8e29953000e176877e161458a2febaeaac5a5e16986595d3acc2418c7d", "catalog_fingerprint": "e519e6916a731ce8fb9bca3edb12410227f73e01ccd43fb6f5fb98276f08985f"}, "sources": [{"url": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "label": "Matching PostgreSQL source archive", "sha256": "49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac"}, {"url": "/docs/devel/indexes-opclass.html", "path": "indexes-opclass.html", "label": "PostgreSQL 20 English manual: indexes-opclass.html", "sha256": "d1b53bbc0ea0321a3274870fa9b3337bc1c60a840d8f83acfe0521e049fffbe4"}, {"url": "/docs/devel/catalog-pg-opfamily.html", "path": "catalog-pg-opfamily.html", "label": "PostgreSQL 20 English manual: catalog-pg-opfamily.html", "sha256": "3aed86f773d2ee43ce6978b520058ef65ecb80f60aca614a1e1b6ef3246f4f98"}, {"url": "/docs/devel/catalog-pg-amop.html", "path": "catalog-pg-amop.html", "label": "PostgreSQL 20 English manual: catalog-pg-amop.html", "sha256": "21308426099a60febe495b5e6edd040a5b0f7cb87269121a33549a930433d19f"}, {"url": "/docs/devel/catalog-pg-amproc.html", "path": "catalog-pg-amproc.html", "label": "PostgreSQL 20 English manual: catalog-pg-amproc.html", "sha256": "4e33c91349b72e274384010c3e265fdb6a18554f81257b4b24dffc114136c3ee"}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/devel/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "20", "build_id": 111, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "81b38d06f59275055ef9cbe975ce20d1d1bec73ae47a5d4b395b209aede5ea80", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "sha256:49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:98c980963b401d40bd50df72b909e7523e3148b8fdb48edd897de2efb67e5235", "translated_from_revision": "sha256:49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac"}, "body_sha256": "d91f30fe519c8afb89fed514978124c9baa310b16f2b42ceb1daf351bae424c8", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac"}, "facts_zh": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "center_zh": {"title": "hash/xid8_ops (family)", "locale": "zh-Hans", "source": {"key": "family-hash-xid8_ops", "locale": "zh-Hans", "version": "20", "text_hash": "98cdd7bd02f19a079bad7c6b55a5c7ef9d20adbcb099924a6dcb21cf4870c927", "collection": "opclass", "dataset_hash": "7c31b524dfe136022d39a6ae8dcfac6b3bbd5f8fdaf422536599981252aff0c9", "source_database": "center", "source_revision": "49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac"}, "payload": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=20", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=20", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/devel/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "20", "build_id": 111, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "81b38d06f59275055ef9cbe975ce20d1d1bec73ae47a5d4b395b209aede5ea80", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "sha256:49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:98c980963b401d40bd50df72b909e7523e3148b8fdb48edd897de2efb67e5235", "translated_from_revision": "sha256:49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac"}, "body_sha256": "d91f30fe519c8afb89fed514978124c9baa310b16f2b42ceb1daf351bae424c8", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac"}, "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em class=\"firstterm\">\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code class=\"type\">int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code class=\"literal\">int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code class=\"type\">int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code class=\"literal\">COLLATE</code>\u3001<code class=\"literal\">ASC</code>/<code class=\"literal\">DESC</code> \u548c/\u6216 <code class=\"literal\">NULLS FIRST</code>/<code class=\"literal\">NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/devel/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "summary": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "version": "20", "link_map": {"/zh/docs/devel/indexes-opclass.html": "/docs/devel/indexes-opclass.html"}, "body_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/devel/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "body_sha256": "380ff796b6dec5f96eb60bf9d234521b02e5494aed85b9b8b8bfa5887e1259dc", "content_hash": "98cdd7bd02f19a079bad7c6b55a5c7ef9d20adbcb099924a6dcb21cf4870c927", "source_database": "center", "source_revision": "49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac"}, "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "description": "equal", "family_slug": "family-hash-xid8_ops", "result_type": "bool", "sort_family": "", "operator_slug": "op-3d-xid8-xid8", "sort_family_slug": ""}], "signature": "hash/xid8_ops", "tables_zh": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=20", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=20", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=20", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "source_oid": "5032", "description": ["xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002"], "sections_zh": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "localization": {"status": "complete", "sources": [{"url": "/docs/devel/catalog-pg-amop.html", "method": "same-major semantic node", "sha256": "e899b3d8b206f52e8dc0ac4b6019e55022abcf901a9d6cf93edf588bc4354664", "language": "zh", "matched_nodes": ["#CATALOG-PG-AMOP/p[2]/em[1]"]}, {"url": "/docs/devel/indexes-opclass.html", "method": "same-major semantic node", "sha256": "166b0550fdb1c3e8c1fbd979c5e41c060ed4cfcdc2d6ba4733ec27d22f45a62d", "language": "zh", "matched_nodes": ["#INDEXES-OPCLASS/p[3]", "#INDEXES-OPCLASS/p[5]", "#INDEXES-OPCLASS/p[6]"]}], "language": "zh", "original_text": {"/summary": "Hash operator family containing 1 classes, 1 operator strategies and 2 support functions in this source build.", "/category": "Hash families", "/versions/20/description/0": "Hash operator family containing 1 classes, 1 operator strategies and 2 support functions in this source build.", "/versions/20/facts/0/label": "Object kind", "/versions/20/facts/0/value": "Operator family", "/versions/20/facts/1/label": "Index AM", "/versions/20/tables/0/title": "Family operator strategies", "/versions/20/tables/1/title": "Family support functions", "/versions/20/tables/2/title": "Classes in this family", "/versions/20/related/0/label": "Hash Index AM", "/versions/20/sections/0/title": "Operator classes and families", "/versions/20/tables/0/rows/0/scope": "Family member", "/versions/20/sections/0/paragraphs/0": "An index definition can specify an operator class for each column of an index.", "/versions/20/sections/0/paragraphs/1": "The operator class identifies the operators to be used by the index for that column. For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).", "/versions/20/sections/0/paragraphs/2": "There are also some built-in operator classes besides the default ones:", "/versions/20/tables/0/rows/0/purpose": "search", "/versions/20/tables/2/rows/0/default": "yes", "/versions/20/tables/0/columns/0/label": "Operator overload", "/versions/20/tables/0/columns/1/label": "Strategy", "/versions/20/tables/0/columns/2/label": "Purpose", "/versions/20/tables/0/columns/3/label": "Ordering family", "/versions/20/tables/0/columns/4/label": "Membership scope", "/versions/20/tables/0/columns/5/label": "Source description", "/versions/20/tables/1/columns/0/label": "Support number", "/versions/20/tables/1/columns/1/label": "Left type", "/versions/20/tables/1/columns/2/label": "Right type", "/versions/20/tables/1/columns/3/label": "Function signature", "/versions/20/tables/1/columns/4/label": "Result type", "/versions/20/tables/2/columns/0/label": "Class", "/versions/20/tables/2/columns/1/label": "Input type", "/versions/20/tables/2/columns/2/label": "Key type", "/versions/20/tables/2/columns/3/label": "Default", "/versions/20/tables/2/rows/0/key_type": "Same as input type", "/versions/20/tables/0/rows/0/description": "equal"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "f5c111c3d56033dab4761ef1406d212c760497f410e3536fd39b2d1cd2037308", "canonical_center_text_hash": "98cdd7bd02f19a079bad7c6b55a5c7ef9d20adbcb099924a6dcb21cf4870c927"}, "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "comparison_data": {"kind": "family", "classes": [{"name": "xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8"}], "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "sort_family": ""}], "attributes": {"name": "xid8_ops", "method": "hash"}, "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashxid8(xid8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int8"}]}, "comparison_hash": "8029a807df0d56fd1f73ee124d2a27f05de6d2764192c1f09dab22170c4dd05e", "manual_language": "zh", "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashxid8(xid8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int8"}], "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/devel/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "source_revalidation": {"kind": "static-same-version-source-and-manual-replay", "audit": "wiki-audit-20261023", "runtime_rerun": false, "compared_fields": "entity membership and source-derived facts; presentation markup normalized", "source_revision": "49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac", "previous_source_revision": "4d3346909b201ac1648232cf290462a7070c119326f56196f1f0253ed80fae41"}}}}, "snapshot": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "family": {"name": "xid8_ops", "method": "hash"}, "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=18", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=18", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "aliases": ["xid8_ops", "hash/xid8_ops"], "classes": [{"name": "xid8_ops", "slug": "class-hash-xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8", "source_oid": "", "family_slug": "family-hash-xid8_ops"}], "related": [{"url": "/wiki/indexam/hash/?v=18", "label": "Hash \u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "label": "18.6", "major": "18", "channel": "stable", "revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f", "source_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f", "manual_fingerprint": "fefce9e478eb2afe5e17e869492bbedc67dce23d317f0a5257240113d6496ebc", "catalog_fingerprint": "deec62e0f0c649d9d0d058ddd0b16bf41afffd569c3fd73949ff0971ce5cabd6"}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "label": "Matching PostgreSQL source archive", "sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "/docs/18/indexes-opclass.html", "path": "indexes-opclass.html", "label": "PostgreSQL 18 English manual: indexes-opclass.html", "sha256": "07de06abf3a2aff2a891a2789def434d9b76705e54d45ca5338dc13451ae2962"}, {"url": "/docs/18/catalog-pg-opfamily.html", "path": "catalog-pg-opfamily.html", "label": "PostgreSQL 18 English manual: catalog-pg-opfamily.html", "sha256": "d4a2b7c2bcb5350b0c1f0111b61e4566f46fd97f48802d3ced2421a7aea60b80"}, {"url": "/docs/18/catalog-pg-amop.html", "path": "catalog-pg-amop.html", "label": "PostgreSQL 18 English manual: catalog-pg-amop.html", "sha256": "e65b90ee78eaf4b4da97ce5b08b972cee2e2660b882ec107be22eca47201f7d1"}, {"url": "/docs/18/catalog-pg-amproc.html", "path": "catalog-pg-amproc.html", "label": "PostgreSQL 18 English manual: catalog-pg-amproc.html", "sha256": "0a09afbde0ba8da9899bf770b86d8301bee116057b16ebe7db0e4a7fca2e91c6"}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/18/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "18", "build_id": 107, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "cce6c9b1d4fbb418823aa7be2585facae45f45a5f75c43bd26170c1383c2a4b5", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:08e987a66af27b98444a8057c256314eafa13611a3fb9e888214fc436824244b", "translated_from_revision": null}, "body_sha256": "660d8ee65a02daf5d80d4417a4bc152fbba91e3ec65cb8442e45e86f557ca5fb", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "facts_zh": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "center_zh": {"title": "hash/xid8_ops (family)", "locale": "zh-Hans", "source": {"key": "family-hash-xid8_ops", "locale": "zh-Hans", "version": "18", "text_hash": "91f1e10cca4b79c01c2b5d6841f155821a151e1a606c9789f12c2b957e9bbf7f", "collection": "opclass", "dataset_hash": "7c31b524dfe136022d39a6ae8dcfac6b3bbd5f8fdaf422536599981252aff0c9", "source_database": "center", "source_revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "payload": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u5bb6\u65cf"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}], "tables": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=18", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=18", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "zh_from": {"kind": "same-version-chinese-manual-with-source-derived-structured-summary", "manual": {"url": "/zh/docs/18/indexes-opclass.html", "anchor": "", "locale": "zh-Hans", "version": "18", "build_id": 107, "page_key": "indexes-opclass.html", "extraction": "concept-introduction", "source_hash": "cce6c9b1d4fbb418823aa7be2585facae45f45a5f75c43bd26170c1383c2a4b5", "fragment_sha256": "dad5545190ebde655fce48dfc13cd02d2863166fac7cf0c2b28b059c9e419ae4", "source_revision": "unknown:rendered-translation-baseline", "translation_revision": "git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:08e987a66af27b98444a8057c256314eafa13611a3fb9e888214fc436824244b", "translated_from_revision": null}, "body_sha256": "660d8ee65a02daf5d80d4417a4bc152fbba91e3ec65cb8442e45e86f557ca5fb", "runtime_rerun": false, "authored_translation": "source-derived-structured-summary", "source_facts_revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "sections": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em class=\"firstterm\">\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code class=\"type\">int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code class=\"literal\">int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code class=\"type\">int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code class=\"literal\">COLLATE</code>\u3001<code class=\"literal\">ASC</code>/<code class=\"literal\">DESC</code> \u548c/\u6216 <code class=\"literal\">NULLS FIRST</code>/<code class=\"literal\">NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/18/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "summary": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "version": "18", "link_map": {"/zh/docs/18/indexes-opclass.html": "/docs/18/indexes-opclass.html"}, "body_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/18/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "body_sha256": "d55b5ec90414fe4bbc9d5d1f7c2f18f59fb90f25006957625c3c6decf2ca880d", "content_hash": "91f1e10cca4b79c01c2b5d6841f155821a151e1a606c9789f12c2b957e9bbf7f", "source_database": "center", "source_revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "description": "equal", "family_slug": "family-hash-xid8_ops", "result_type": "bool", "sort_family": "", "operator_slug": "op-3d-xid8-xid8", "sort_family_slug": ""}], "signature": "hash/xid8_ops", "tables_zh": [{"key": "operators", "rows": [{"scope": "\u5bb6\u65cf\u6210\u5458", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-xid8-xid8/?v=18", "text": "=(xid8,xid8)"}, "strategy": "1", "description": "\u7b49\u4e8e", "sort_family": ""}], "title": "\u5bb6\u65cf\u4e2d\u7684\u64cd\u4f5c\u7b26\u7b56\u7565", "columns": [{"key": "operator", "label": "\u64cd\u4f5c\u7b26\u91cd\u8f7d"}, {"key": "strategy", "label": "\u7b56\u7565"}, {"key": "purpose", "label": "\u7528\u9014"}, {"key": "sort_family", "label": "\u6392\u5e8f\u5bb6\u65cf"}, {"key": "scope", "label": "\u6210\u5458\u8303\u56f4"}, {"key": "description", "label": "\u6e90\u7801\u8bf4\u660e"}]}, {"key": "support-functions", "rows": [{"number": "1", "function": "hashxid8(xid8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int4"}, {"number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "right_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}, "result_type": "int8"}], "title": "\u5bb6\u65cf\u652f\u6301\u51fd\u6570", "columns": [{"key": "number", "label": "\u652f\u6301\u51fd\u6570\u7f16\u53f7"}, {"key": "left_type", "label": "\u5de6\u4fa7\u7c7b\u578b"}, {"key": "right_type", "label": "\u53f3\u4fa7\u7c7b\u578b"}, {"key": "function", "label": "\u51fd\u6570\u7b7e\u540d"}, {"key": "result_type", "label": "\u8fd4\u56de\u7c7b\u578b"}]}, {"key": "classes", "rows": [{"class": {"url": "/wiki/opclass/class-hash-xid8_ops/?v=18", "text": "xid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/xid8/?v=18", "text": "xid8"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": "class", "label": "\u64cd\u4f5c\u7b26\u7c7b"}, {"key": "input_type", "label": "\u8f93\u5165\u7c7b\u578b"}, {"key": "key_type", "label": "\u952e\u7c7b\u578b"}, {"key": "default", "label": "\u9ed8\u8ba4\u503c"}]}], "source_oid": "5032", "description": ["xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002"], "sections_zh": [{"title": "\u64cd\u4f5c\u7b26\u7c7b\u4e0e\u5bb6\u65cf", "paragraphs": ["\u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a \u64cd\u4f5c\u7b26\u7c7b \u3002", "\u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b int4 \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 int4_ops \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 int4 \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 COLLATE \u3001 ASC / DESC \u548c/\u6216 NULLS FIRST / NULLS LAST \u6765\u4fee\u6539\uff09\u3002", "\u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a"]}], "localization": {"status": "complete", "sources": [{"url": "/docs/18/catalog-pg-amop.html", "method": "same-major semantic node", "sha256": "c46185aa5f574dacd289a0b3876023793406b4cf58dee7eeebb86436d0577bdc", "language": "zh", "matched_nodes": ["#CATALOG-PG-AMOP/p[2]/em[1]"]}, {"url": "/docs/18/indexes-opclass.html", "method": "same-major semantic node", "sha256": "d2d3789266054f227a79e8de0e96355c10b20598c2958745751fea464d457f8d", "language": "zh", "matched_nodes": ["#INDEXES-OPCLASS/p[3]", "#INDEXES-OPCLASS/p[5]", "#INDEXES-OPCLASS/p[6]"]}], "language": "zh", "original_text": {"/versions/18/description/0": "Hash operator family containing 1 classes, 1 operator strategies and 2 support functions in this source build.", "/versions/18/facts/0/label": "Object kind", "/versions/18/facts/0/value": "Operator family", "/versions/18/facts/1/label": "Index AM", "/versions/18/tables/0/title": "Family operator strategies", "/versions/18/tables/1/title": "Family support functions", "/versions/18/tables/2/title": "Classes in this family", "/versions/18/related/0/label": "Hash Index AM", "/versions/18/sections/0/title": "Operator classes and families", "/versions/18/tables/0/rows/0/scope": "Family member", "/versions/18/sections/0/paragraphs/0": "An index definition can specify an operator class for each column of an index.", "/versions/18/sections/0/paragraphs/1": "The operator class identifies the operators to be used by the index for that column. For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).", "/versions/18/sections/0/paragraphs/2": "There are also some built-in operator classes besides the default ones:", "/versions/18/tables/0/rows/0/purpose": "search", "/versions/18/tables/2/rows/0/default": "yes", "/versions/18/tables/0/columns/0/label": "Operator overload", "/versions/18/tables/0/columns/1/label": "Strategy", "/versions/18/tables/0/columns/2/label": "Purpose", "/versions/18/tables/0/columns/3/label": "Ordering family", "/versions/18/tables/0/columns/4/label": "Membership scope", "/versions/18/tables/0/columns/5/label": "Source description", "/versions/18/tables/1/columns/0/label": "Support number", "/versions/18/tables/1/columns/1/label": "Left type", "/versions/18/tables/1/columns/2/label": "Right type", "/versions/18/tables/1/columns/3/label": "Function signature", "/versions/18/tables/1/columns/4/label": "Result type", "/versions/18/tables/2/columns/0/label": "Class", "/versions/18/tables/2/columns/1/label": "Input type", "/versions/18/tables/2/columns/2/label": "Key type", "/versions/18/tables/2/columns/3/label": "Default", "/versions/18/tables/2/rows/0/key_type": "Same as input type", "/versions/18/tables/0/rows/0/description": "equal"}, "fallback_fields": [], "source_language": "en", "original_snapshot_sha256": "14e2aeb27d2a997287ffbc93a2d7b44d5d179c4494804597d7363da08254c302", "canonical_center_text_hash": "91f1e10cca4b79c01c2b5d6841f155821a151e1a606c9789f12c2b957e9bbf7f"}, "description_zh": "xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002", "comparison_data": {"kind": "family", "classes": [{"name": "xid8_ops", "family": "xid8_ops", "method": "hash", "default": "t", "key_type": "none", "input_type": "xid8"}], "operators": [{"family": "xid8_ops", "method": "hash", "purpose": "search", "operator": "=(xid8,xid8)", "strategy": "1", "left_type": "xid8", "right_type": "xid8", "sort_family": ""}], "attributes": {"name": "xid8_ops", "method": "hash"}, "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashxid8(xid8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": "xid8", "right_type": "xid8", "result_type": "int8"}]}, "comparison_hash": "8029a807df0d56fd1f73ee124d2a27f05de6d2764192c1f09dab22170c4dd05e", "manual_language": "zh", "support_functions": [{"family": "xid8_ops", "method": "hash", "number": "1", "function": "hashxid8(xid8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int4"}, {"family": "xid8_ops", "method": "hash", "number": "2", "function": "hashxid8extended(xid8,int8)", "left_type": "xid8", "right_type": "xid8", "family_slug": "family-hash-xid8_ops", "result_type": "int8"}], "description_zh_html": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/zh/docs/18/indexes-opclass.html\" rel=\"nofollow\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>", "center_zh_rendered": "<p>xid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u65cf\u3002</p><dl><dt>\u540d\u79f0</dt><dd><code>xid8_ops</code></dd><dt>\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5</dt><dd><code>hash</code></dd></dl><h3>\u7b56\u7565\u8fd0\u7b97\u7b26</h3><table><thead><tr><th>\u7b56\u7565\u7f16\u53f7</th><th>\u7528\u9014</th><th>\u8fd0\u7b97\u7b26</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>\u641c\u7d22</code></td><td><code>=(xid8,xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code></code></td></tr></tbody></table><h3>\u652f\u6301\u51fd\u6570</h3><table><thead><tr><th>\u652f\u6301\u51fd\u6570\u7f16\u53f7</th><th>\u5b9e\u73b0\u51fd\u6570</th><th>\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b</th><th>\u7ed3\u679c\u7c7b\u578b</th></tr></thead><tbody><tr><td><code>1</code></td><td><code>hashxid8(xid8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int4</code></td></tr><tr><td><code>2</code></td><td><code>hashxid8extended(xid8,int8)</code></td><td><code>xid8</code></td><td><code>xid8</code></td><td><code>int8</code></td></tr></tbody></table><h3>\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009</h3><p>\n   \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a<em>\u64cd\u4f5c\u7b26\u7c7b</em>\u3002\n</p><p>\n   \u64cd\u4f5c\u7b26\u7c7b\u6807\u8bc6\u8be5\u7d22\u5f15\u5728\u8be5\u5217\u4e0a\u8981\u4f7f\u7528\u54ea\u4e9b\u64cd\u4f5c\u7b26\u3002\u4f8b\u5982\uff0c\u7c7b\u578b <code>int4</code> \u4e0a\u7684\u4e00\u4e2a B-\u6811\u7d22\u5f15\u4f1a\u4f7f\u7528 <code>int4_ops</code> \u7c7b\uff1b\u8fd9\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u5305\u542b\u5bf9 <code>int4</code> \u503c\u8fdb\u884c\u6bd4\u8f83\u6240\u9700\u7684\u51fd\u6570\u3002\u5b9e\u8df5\u4e2d\uff0c\u5217\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\u3002\u4e4b\u6240\u4ee5\u5b58\u5728\u64cd\u4f5c\u7b26\u7c7b\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u5bf9\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u6765\u8bf4\uff0c\u53ef\u80fd\u5b58\u5728\u591a\u79cd\u6709\u610f\u4e49\u7684\u7d22\u5f15\u884c\u4e3a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6309\u7edd\u5bf9\u503c\u6392\u5e8f\u4e00\u79cd\u590d\u6570\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u6309\u5b9e\u90e8\u6392\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e3a\u8be5\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u4e24\u4e2a\u64cd\u4f5c\u7b26\u7c7b\uff0c\u5e76\u5728\u521b\u5efa\u7d22\u5f15\u65f6\u9009\u62e9\u5408\u9002\u7684\u90a3\u4e2a\u6765\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u64cd\u4f5c\u7b26\u7c7b\u51b3\u5b9a\u4e86\u57fa\u7840\u6392\u5e8f\u987a\u5e8f\uff08\u4e4b\u540e\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u6392\u5e8f\u9009\u9879 <code>COLLATE</code>\u3001<code>ASC</code>/<code>DESC</code> \u548c/\u6216 <code>NULLS FIRST</code>/<code>NULLS LAST</code> \u6765\u4fee\u6539\uff09\u3002\n  </p><p>\n   \u9664\u4e86\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5185\u7f6e\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n   </p><p>\n    \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n</p><p><a href=\"/docs/18/indexes-opclass.html\">\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587</a>\u3002</p>"}, "comparison": {"left": "17", "right": "18", "status": "changed", "diff": "--- PostgreSQL 17\n+++ PostgreSQL 18\n@@ -29,7 +29,7 @@\n   \"support_functions\": [\n     {\n       \"family\": \"xid8_ops\",\n-      \"function\": \"hashint8(int8)\",\n+      \"function\": \"hashxid8(xid8)\",\n       \"left_type\": \"xid8\",\n       \"method\": \"hash\",\n       \"number\": \"1\",\n@@ -38,7 +38,7 @@\n     },\n     {\n       \"family\": \"xid8_ops\",\n-      \"function\": \"hashint8extended(int8,int8)\",\n+      \"function\": \"hashxid8extended(xid8,int8)\",\n       \"left_type\": \"xid8\",\n       \"method\": \"hash\",\n       \"number\": \"2\","}}