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"~>~(text,text)", "strategy": "5", "left_type": "text", "right_type": "text", "sort_family": ""}], "attributes": {"name": "text_pattern_ops", "family": "text_pattern_ops", "method": "btree", "default": "f", "key_type": "none", "input_type": "text"}, "support_functions": [{"family": "text_pattern_ops", "method": "btree", "number": "1", "function": "bttext_pattern_cmp(text,text)", "left_type": "text", "right_type": "text", "result_type": "int4"}, {"family": "text_pattern_ops", "method": "btree", "number": "2", "function": "bttext_pattern_sortsupport(internal)", "left_type": "text", "right_type": "text", "result_type": "void"}]}, "comparison_hash": "ebea4a58bb28d14d59659b41072543b19d739fb55db3366f8a1a972030c214bc", "support_functions": [{"family": "text_pattern_ops", "method": "btree", "number": "1", "function": "bttext_pattern_cmp(text,text)", "left_type": "text", "right_type": "text", "family_slug": "family-btree-text_pattern_ops", "result_type": "int4"}, {"family": "text_pattern_ops", "method": "btree", "number": "2", "function": "bttext_pattern_sortsupport(internal)", "left_type": "text", "right_type": "text", "family_slug": "family-btree-text_pattern_ops", "result_type": "void"}]}, "11": {"class": {"name": "text_pattern_ops", "family": "text_pattern_ops", "method": "btree", "default": "f", "key_type": "none", "input_type": "text"}, "facts": [{"label": "\u5bf9\u8c61\u79cd\u7c7b", "value": "\u64cd\u4f5c\u7b26\u7c7b"}, {"label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5", "value": "B-tree"}, {"label": "\u8f93\u5165\u7c7b\u578b", "value": "text"}, {"label": "\u5b58\u50a8\u952e\u7c7b\u578b", "value": "\u4e0e\u8f93\u5165\u7c7b\u578b\u76f8\u540c\uff08\u76ee\u5f55\u503c\u4e3a\u96f6\uff09"}, {"label": "\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b", "value": "\u5426"}], "tables": [{"key": "operators", "rows": [{"scope": "\u64cd\u4f5c\u7b26\u7c7b\u8f93\u5165\u7c7b\u578b\u5bf9", "purpose": "\u641c\u7d22", "operator": {"url": "/wiki/operator/op-7e3c7e-text-text/?v=11", "text": 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"result_type": "void"}], "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-btree-text_pattern_ops/?v=11", "text": "text_pattern_ops"}, "default": "\u5426", "key_type": "\u4e0e\u8f93\u5165\u7c7b\u578b\u76f8\u540c", "input_type": {"url": "/wiki/type/text/?v=11", "text": "text"}}, {"class": {"url": "/wiki/opclass/class-btree-varchar_pattern_ops/?v=11", "text": "varchar_pattern_ops"}, "default": "\u5426", "key_type": "\u4e0e\u8f93\u5165\u7c7b\u578b\u76f8\u540c", "input_type": {"url": "/wiki/type/text/?v=11", "text": "text"}}], "title": "\u672c\u5bb6\u65cf\u7684\u64cd\u4f5c\u7b26\u7c7b", "columns": [{"key": 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"original_url": "/docs/11/catalog-pg-amproc.html"}, {"url": "https://pg.center/docs/11/indexes-opclass.html", "path": "indexes-opclass.html", "label": "PostgreSQL 11 English manual: indexes-opclass.html", "sha256": "234c67ab5a33096697e1851c197c79ba0e872686c7909c2696716a102253c7bd", "language": "en", "original_url": "/docs/11/indexes-opclass.html"}], "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"]}, {"title": "\u4e13\u9898\u624b\u518c\u8bf4\u660e", "paragraphs": ["\u64cd\u4f5c\u7b26\u7c7b text_pattern_ops \u3001 varchar_pattern_ops \u548c bpchar_pattern_ops \u5206\u522b\u652f\u6301\u7c7b\u578b text \u3001 varchar \u548c char \u4e0a\u7684 B-\u6811\u7d22\u5f15\u3002\u5b83\u4eec\u4e0e\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u7684\u533a\u522b\u5728\u4e8e\uff0c\u503c\u662f\u4e25\u683c\u6309\u5b57\u7b26\u9010\u4e2a\u6bd4\u8f83\uff0c\u800c\u4e0d\u662f\u6309\u7167\u533a\u57df\u8bbe\u7f6e\u76f8\u5173\u7684\u6392\u5e8f\u89c4\u5219\u6bd4\u8f83\u3002\u56e0\u6b64\uff0c\u5f53\u6570\u636e\u5e93\u672a\u4f7f\u7528\u6807\u51c6 \u201c C \u201d \u533a\u57df\u8bbe\u7f6e\u65f6\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u7b26\u7c7b\u9002\u7528\u4e8e\u6d89\u53ca\u6a21\u5f0f\u5339\u914d\u8868\u8fbe\u5f0f\uff08 LIKE \u6216 POSIX \u6b63\u5219\u8868\u8fbe\u5f0f\uff09\u7684\u67e5\u8be2\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u50cf\u8fd9\u6837\u4e3a\u4e00\u4e2a varchar \u5217\u5efa\u7acb\u7d22\u5f15\uff1a"]}], "operators": [{"family": "text_pattern_ops", "method": "btree", "purpose": "search", "operator": "~<~(text,text)", "strategy": "1", "left_type": "text", "right_type": "text", "description": "less than", "family_slug": "family-btree-text_pattern_ops", "result_type": "bool", "sort_family": "", "operator_slug": "op-7e3c7e-text-text", "sort_family_slug": ""}, {"family": "text_pattern_ops", "method": "btree", "purpose": "search", "operator": "~<=~(text,text)", "strategy": "2", "left_type": "text", "right_type": "text", "description": "less than or equal", "family_slug": "family-btree-text_pattern_ops", "result_type": "bool", "sort_family": "", 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text_pattern_ops.", "/versions/12/facts/0/label": "Object kind", "/versions/12/facts/0/value": "Operator class", "/versions/12/facts/1/label": "Index AM", "/versions/12/facts/2/label": "Input type", "/versions/12/facts/3/label": "Stored key type", "/versions/12/facts/3/value": "Same as input type (catalog zero)", "/versions/12/facts/4/label": "Default class", "/versions/12/facts/4/value": "no", "/versions/12/tables/0/title": "Family operator strategies", "/versions/12/tables/1/title": "Family support functions", "/versions/12/tables/2/title": "Classes in this family", "/versions/12/related/0/label": "B-tree Index AM", "/versions/12/related/1/label": "text_pattern_ops family", "/versions/12/related/2/label": "text data type", "/versions/12/sections/0/title": "Operator classes and families", "/versions/12/sections/1/title": "Specific manual guidance", "/versions/12/tables/0/rows/0/scope": "Class input pair", "/versions/12/tables/0/rows/1/scope": "Class input pair", "/versions/12/tables/0/rows/2/scope": "Class input pair", "/versions/12/tables/0/rows/3/scope": "Class input pair", "/versions/12/tables/0/rows/4/scope": "Class input pair", "/versions/12/sections/0/paragraphs/0": "An index definition can specify an operator class for each column of an index.", "/versions/12/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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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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"/versions/16/related/2/label": "text data type", "/versions/16/sections/0/title": "Operator classes and families", "/versions/16/sections/1/title": "Specific manual guidance", "/versions/16/tables/0/rows/0/scope": "Class input pair", "/versions/16/tables/0/rows/1/scope": "Class input pair", "/versions/16/tables/0/rows/2/scope": "Class input pair", "/versions/16/tables/0/rows/3/scope": "Class input pair", "/versions/16/tables/0/rows/4/scope": "Class input pair", "/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/sections/1/paragraphs/0": "The operator classes text_pattern_ops , varchar_pattern_ops , and bpchar_pattern_ops support B-tree indexes on the types text , varchar , and char respectively. The difference from the default operator classes is that the values are compared strictly character by character rather than according to the locale-specific collation rules. This makes these operator classes suitable for use by queries involving pattern matching expressions ( LIKE or POSIX regular expressions) when the database does not use the standard \u201c C \u201d locale. 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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/sections/1/paragraphs/0": "The operator classes text_pattern_ops , varchar_pattern_ops , and bpchar_pattern_ops support B-tree indexes on the types text , varchar , and char respectively. The difference from the default operator classes is that the values are compared strictly character by character rather than according to the locale-specific collation rules. This makes these operator classes suitable for use by queries involving pattern matching expressions ( LIKE or POSIX regular expressions) when the database does not use the standard \u201c C \u201d locale. 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"/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/2/rows/1/key_type": "Same as input type", "/versions/18/tables/0/rows/0/description": "less than", "/versions/18/tables/0/rows/1/description": "less than or equal", "/versions/18/tables/0/rows/2/description": "equal", "/versions/18/tables/0/rows/3/description": "greater than or equal", "/versions/18/tables/0/rows/4/description": "greater than", "/versions/18/tables/1/rows/0/left_type/text": "text", "/versions/18/tables/1/rows/1/left_type/text": "text", "/versions/18/tables/1/rows/2/left_type/text": "text", "/versions/18/tables/1/rows/0/right_type/text": "text", "/versions/18/tables/1/rows/1/right_type/text": "text", 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"label": "PostgreSQL 19 English manual: catalog-pg-amproc.html", "sha256": "156082a05f95005ad8fabba56d5880f15f3b194d5f378ffee29a77066c77de12", "language": "en", "original_url": "/docs/19/catalog-pg-amproc.html"}, {"url": "https://pg.center/docs/19/indexes-opclass.html", "path": "indexes-opclass.html", "label": "PostgreSQL 19 English manual: indexes-opclass.html", "sha256": "eba382a4227a2865a52fb015c7aec0dbde33d3c24373e3f9ba11e1daeae8b89c", "language": "en", "original_url": "/docs/19/indexes-opclass.html"}], "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 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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"]}, {"title": "\u4e13\u9898\u624b\u518c\u8bf4\u660e", "paragraphs": ["\u64cd\u4f5c\u7b26\u7c7b text_pattern_ops \u3001 varchar_pattern_ops \u548c bpchar_pattern_ops \u5206\u522b\u652f\u6301\u7c7b\u578b text \u3001 varchar \u548c char \u4e0a\u7684 B-\u6811\u7d22\u5f15\u3002\u5b83\u4eec\u4e0e\u9ed8\u8ba4\u64cd\u4f5c\u7b26\u7c7b\u7684\u533a\u522b\u5728\u4e8e\uff0c\u503c\u662f\u4e25\u683c\u6309\u5b57\u7b26\u9010\u4e2a\u6bd4\u8f83\uff0c\u800c\u4e0d\u662f\u6309\u7167\u533a\u57df\u8bbe\u7f6e\u76f8\u5173\u7684\u6392\u5e8f\u89c4\u5219\u6bd4\u8f83\u3002\u56e0\u6b64\uff0c\u5f53\u6570\u636e\u5e93\u672a\u4f7f\u7528\u6807\u51c6 \u201c C \u201d 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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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"family-btree-text_pattern_ops", "result_type": "bool"}]}, "comparison": {"left": "12", "right": "13", "status": "changed", "diff": "--- PostgreSQL 12\n+++ PostgreSQL 13\n@@ -96,6 +96,15 @@\n       \"number\": \"2\",\n       \"result_type\": \"void\",\n       \"right_type\": \"text\"\n+    },\n+    {\n+      \"family\": \"text_pattern_ops\",\n+      \"function\": \"btequalimage(oid)\",\n+      \"left_type\": \"text\",\n+      \"method\": \"btree\",\n+      \"number\": \"4\",\n+      \"result_type\": \"bool\",\n+      \"right_type\": \"text\"\n     }\n   ]\n }"}}