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oid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u7c7b\u3002

\u540d\u79f0
oid8_ops
\u8fd0\u7b97\u7b26\u65cf
oid8_ops
\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5
hash
\u9ed8\u8ba4\u7c7b
\u662f
\u5b58\u50a8\u952e\u7c7b\u578b
\u65e0
\u8f93\u5165\u7c7b\u578b
oid8

\u7b56\u7565\u8fd0\u7b97\u7b26

\u7b56\u7565\u7f16\u53f7\u7528\u9014\u8fd0\u7b97\u7b26\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf
1\u641c\u7d22=(oid8,oid8)oid8oid8

\u652f\u6301\u51fd\u6570

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1hashoid8(oid8)oid8oid8int4
2hashoid8extended(oid8,int8)oid8oid8int8

\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009

\n \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u3002\n

\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 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\u3001ASC/DESC \u548c/\u6216 NULLS FIRST/NULLS LAST \u6765\u4fee\u6539\uff09\u3002\n

\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

\n \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n

\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587\u3002

"}, "summary": "oid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u7c7b\u3002", "version": "19", "link_map": {"/zh/docs/19/indexes-opclass.html": "/docs/19/indexes-opclass.html"}, "body_html": "

oid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u7c7b\u3002

\u540d\u79f0
oid8_ops
\u8fd0\u7b97\u7b26\u65cf
oid8_ops
\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5
hash
\u9ed8\u8ba4\u7c7b
\u662f
\u5b58\u50a8\u952e\u7c7b\u578b
\u65e0
\u8f93\u5165\u7c7b\u578b
oid8

\u7b56\u7565\u8fd0\u7b97\u7b26

\u7b56\u7565\u7f16\u53f7\u7528\u9014\u8fd0\u7b97\u7b26\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf
1\u641c\u7d22=(oid8,oid8)oid8oid8

\u652f\u6301\u51fd\u6570

\u652f\u6301\u51fd\u6570\u7f16\u53f7\u5b9e\u73b0\u51fd\u6570\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b\u7ed3\u679c\u7c7b\u578b
1hashoid8(oid8)oid8oid8int4
2hashoid8extended(oid8,int8)oid8oid8int8

\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009

\n \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u3002\n

\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 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\u3001ASC/DESC \u548c/\u6216 NULLS FIRST/NULLS LAST \u6765\u4fee\u6539\uff09\u3002\n

\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

\n \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n

\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587\u3002

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["\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 class for oid8; member of oid8_ops.", "/versions/19/facts/0/label": "Object kind", "/versions/19/facts/0/value": "Operator class", "/versions/19/facts/1/label": "Index AM", "/versions/19/facts/2/label": "Input type", "/versions/19/facts/3/label": "Stored key type", "/versions/19/facts/3/value": "Same as input type (catalog zero)", "/versions/19/facts/4/label": "Default class", "/versions/19/facts/4/value": "yes", "/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/related/1/label": "oid8_ops family", "/versions/19/related/2/label": "oid8 data type", "/versions/19/sections/0/title": "Operator classes and families", "/versions/19/tables/0/rows/0/scope": "Class input pair", "/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. 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oid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u7c7b\u3002

\u540d\u79f0
oid8_ops
\u8fd0\u7b97\u7b26\u65cf
oid8_ops
\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5
hash
\u9ed8\u8ba4\u7c7b
\u662f
\u5b58\u50a8\u952e\u7c7b\u578b
\u65e0
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oid8

\u7b56\u7565\u8fd0\u7b97\u7b26

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1\u641c\u7d22=(oid8,oid8)oid8oid8

\u652f\u6301\u51fd\u6570

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1hashoid8(oid8)oid8oid8int4
2hashoid8extended(oid8,int8)oid8oid8int8

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"\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/oid8_ops (class)", "locale": "zh-Hans", "source": {"key": "class-hash-oid8_ops", "locale": "zh-Hans", "version": "20", "text_hash": "141a815b890e3a3ffe5da6f7e6924af358b7e6679b247a726c7c5b99f56955c7", "collection": "opclass", "dataset_hash": "7c31b524dfe136022d39a6ae8dcfac6b3bbd5f8fdaf422536599981252aff0c9", "source_database": "center", "source_revision": "49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac"}, "payload": {"facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u7c7b"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "Hash"}, {"label": "\u8f93\u5165\u7c7b\u578b", "value": "oid8"}, {"label": "\u5b58\u50a8\u952e\u7c7b\u578b", "value": "Same as input type (catalog zero)"}, {"label": "\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b", "value": "\u662f"}], "tables": [{"key": "operators", "rows": [{"scope": "\u64cd\u4f5c\u7b26\u7c7b\u8f93\u5165\u7c7b\u578b\u5bf9", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-3d-oid8-oid8/?v=20", "text": "=(oid8,oid8)"}, "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": "hashoid8(oid8)", "left_type": {"url": "/wiki/type/oid8/?v=20", "text": "oid8"}, "right_type": {"url": "/wiki/type/oid8/?v=20", "text": "oid8"}, "result_type": "int4"}, {"number": "2", "function": "hashoid8extended(oid8,int8)", "left_type": {"url": "/wiki/type/oid8/?v=20", "text": "oid8"}, "right_type": {"url": "/wiki/type/oid8/?v=20", "text": "oid8"}, "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-oid8_ops/?v=20", "text": "oid8_ops"}, "default": "\u662f", "key_type": "Same as input type", "input_type": {"url": "/wiki/type/oid8/?v=20", "text": "oid8"}}], "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": "ab5646bd547096dc88ce4b1255795db065199fe677ff9c946e7f60a332d28cd7", "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": "oid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u7c7b\u3002", "description_zh_html": "

oid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u7c7b\u3002

\u540d\u79f0
oid8_ops
\u8fd0\u7b97\u7b26\u65cf
oid8_ops
\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5
hash
\u9ed8\u8ba4\u7c7b
\u662f
\u5b58\u50a8\u952e\u7c7b\u578b
\u65e0
\u8f93\u5165\u7c7b\u578b
oid8

\u7b56\u7565\u8fd0\u7b97\u7b26

\u7b56\u7565\u7f16\u53f7\u7528\u9014\u8fd0\u7b97\u7b26\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf
1\u641c\u7d22=(oid8,oid8)oid8oid8

\u652f\u6301\u51fd\u6570

\u652f\u6301\u51fd\u6570\u7f16\u53f7\u5b9e\u73b0\u51fd\u6570\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b\u7ed3\u679c\u7c7b\u578b
1hashoid8(oid8)oid8oid8int4
2hashoid8extended(oid8,int8)oid8oid8int8

\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009

\n \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u3002\n

\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 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\u3001ASC/DESC \u548c/\u6216 NULLS FIRST/NULLS LAST \u6765\u4fee\u6539\uff09\u3002\n

\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

\n \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n

\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587\u3002

"}, "summary": "oid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u7c7b\u3002", "version": "20", "link_map": {"/zh/docs/devel/indexes-opclass.html": "/docs/devel/indexes-opclass.html"}, "body_html": "

oid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u7c7b\u3002

\u540d\u79f0
oid8_ops
\u8fd0\u7b97\u7b26\u65cf
oid8_ops
\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5
hash
\u9ed8\u8ba4\u7c7b
\u662f
\u5b58\u50a8\u952e\u7c7b\u578b
\u65e0
\u8f93\u5165\u7c7b\u578b
oid8

\u7b56\u7565\u8fd0\u7b97\u7b26

\u7b56\u7565\u7f16\u53f7\u7528\u9014\u8fd0\u7b97\u7b26\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf
1\u641c\u7d22=(oid8,oid8)oid8oid8

\u652f\u6301\u51fd\u6570

\u652f\u6301\u51fd\u6570\u7f16\u53f7\u5b9e\u73b0\u51fd\u6570\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b\u7ed3\u679c\u7c7b\u578b
1hashoid8(oid8)oid8oid8int4
2hashoid8extended(oid8,int8)oid8oid8int8

\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009

\n \u4e00\u4e2a\u7d22\u5f15\u5b9a\u4e49\u53ef\u4ee5\u4e3a\u7d22\u5f15\u7684\u6bcf\u4e00\u5217\u6307\u5b9a\u4e00\u4e2a\u64cd\u4f5c\u7b26\u7c7b\u3002\n

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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. 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oid8_ops \u662f hash \u7684\u8fd0\u7b97\u7b26\u7c7b\u3002

\u540d\u79f0
oid8_ops
\u8fd0\u7b97\u7b26\u65cf
oid8_ops
\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5
hash
\u9ed8\u8ba4\u7c7b
\u662f
\u5b58\u50a8\u952e\u7c7b\u578b
\u65e0
\u8f93\u5165\u7c7b\u578b
oid8

\u7b56\u7565\u8fd0\u7b97\u7b26

\u7b56\u7565\u7f16\u53f7\u7528\u9014\u8fd0\u7b97\u7b26\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b\u6392\u5e8f\u8fd0\u7b97\u7b26\u65cf
1\u641c\u7d22=(oid8,oid8)oid8oid8

\u652f\u6301\u51fd\u6570

\u652f\u6301\u51fd\u6570\u7f16\u53f7\u5b9e\u73b0\u51fd\u6570\u5de6\u64cd\u4f5c\u6570\u7c7b\u578b\u53f3\u64cd\u4f5c\u6570\u7c7b\u578b\u7ed3\u679c\u7c7b\u578b
1hashoid8(oid8)oid8oid8int4
2hashoid8extended(oid8,int8)oid8oid8int8

\u540c\u7248\u672c\u4e2d\u6587\u624b\u518c\u8282\u9009

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\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

\n \u4e0b\u9762\u7684\u67e5\u8be2\u4f1a\u663e\u793a\u6240\u6709\u5df2\u5b9a\u4e49\u7684\u64cd\u4f5c\u7b26\u7c7b\uff1a\n\n

\u67e5\u770b\u5b8c\u6574\u4e2d\u6587\u624b\u518c\u4e0e\u4e0a\u4e0b\u6587\u3002

", "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": null, "comparison": {"left": "18", "right": "19", "status": "added", "diff": "--- PostgreSQL 18\n+++ PostgreSQL 19\n@@ -1 +1,53 @@\n-\u8be5\u7248\u672a\u6536\u5f55\n+{\n+ \"attributes\": {\n+ \"default\": \"t\",\n+ \"family\": \"oid8_ops\",\n+ \"input_type\": \"oid8\",\n+ \"key_type\": \"none\",\n+ \"method\": \"hash\",\n+ \"name\": \"oid8_ops\"\n+ },\n+ \"classes\": [\n+ {\n+ \"default\": \"t\",\n+ \"family\": \"oid8_ops\",\n+ \"input_type\": \"oid8\",\n+ \"key_type\": \"none\",\n+ \"method\": \"hash\",\n+ \"name\": \"oid8_ops\"\n+ }\n+ ],\n+ \"kind\": \"class\",\n+ \"operators\": [\n+ {\n+ \"family\": \"oid8_ops\",\n+ \"left_type\": \"oid8\",\n+ \"method\": \"hash\",\n+ \"operator\": \"=(oid8,oid8)\",\n+ \"purpose\": \"search\",\n+ \"right_type\": \"oid8\",\n+ \"sort_family\": \"\",\n+ \"strategy\": \"1\"\n+ }\n+ ],\n+ \"support_functions\": [\n+ {\n+ \"family\": \"oid8_ops\",\n+ \"function\": \"hashoid8(oid8)\",\n+ \"left_type\": \"oid8\",\n+ \"method\": \"hash\",\n+ \"number\": \"1\",\n+ \"result_type\": \"int4\",\n+ \"right_type\": \"oid8\"\n+ },\n+ {\n+ \"family\": \"oid8_ops\",\n+ \"function\": \"hashoid8extended(oid8,int8)\",\n+ \"left_type\": \"oid8\",\n+ \"method\": \"hash\",\n+ \"number\": \"2\",\n+ \"result_type\": \"int8\",\n+ \"right_type\": \"oid8\"\n+ }\n+ ]\n+}"}}