{"Entry":{"collection":"operator","key":"op-2323-lseg-lseg","name":"##(lseg,lseg)","aliases":["##","##(lseg,lseg)"],"metadata":{"aliases":["##","##(lseg,lseg)"],"category":"Geometric","content_hash":"488b59c6fffd86e3a539e3a247187ff52dff90293c5211661faed7ef26348db0","derived_content_hash":"c005dd547a4c29737bdc06233ac2554d399176a75431008eec18dbeee6e7764e","imported_at":"2026-09-30T00:40:40.390276+08:00","name":"##(lseg,lseg)","name_zh":"","slug":"op-2323-lseg-lseg","summary":"closest point to A on B"}},"Definition":{"Collection":"operator","Key":"op-2323-lseg-lseg","SourceDatabase":"center","Version":"18","SourceTable":"pg_operator_entry","SourceKey":"op-2323-lseg-lseg","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","Facts":{"aliases":["##","##(lseg,lseg)"],"comparison_data":{"memberships":[],"operator":{"commutator":"","function":"close_lseg(lseg,lseg)","hash_join":"f","kind":"b","left_type":"lseg","merge_join":"f","negator":"","result_type":"point","right_type":"lseg","symbol":"##"}},"comparison_hash":"7162d3e785cf7051826ebcc87606b70ff3fae34c21ca4da1052b9ee0ebc750e8","description":["closest point to A on B"],"description_zh":"B 上距离 A 最近的点。","description_zh_html":"\u003cp\u003eB 上距离 A 最近的点。\u003c/p\u003e\u003cdl\u003e\u003cdt\u003e种类\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003eb\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003e符号\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003e##\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003e实现函数\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003eclose_lseg(lseg,lseg)\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003e可用于哈希连接\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003e否\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003e左操作数类型\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003elseg\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003e可用于归并连接\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003e否\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003e右操作数类型\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003elseg\u003c/code\u003e\u003c/dd\u003e\u003cdt\u003e结果类型\u003c/dt\u003e\u003cdd\u003e\u003ccode\u003epoint\u003c/code\u003e\u003c/dd\u003e\u003c/dl\u003e\u003ch3\u003e同版本中文手册节选\u003c/h3\u003e\u003cp\u003e\n   目录 \u003ccode class=\"structname\"\u003epg_operator\u003c/code\u003e 存储关于操作符的信息。详见 \u003ca class=\"xref\" href=\"/zh/docs/18/sql-createoperator.html\"\u003e\u003cspan class=\"refentrytitle\"\u003eCREATE OPERATOR\u003c/span\u003e\u003c/a\u003e 和\u003ca class=\"xref\" href=\"/zh/docs/18/xoper.html\"\u003e第 36.14 节\u003c/a\u003e。\n  \u003c/p\u003e\u003cp\u003e\u003ca href=\"/zh/docs/18/catalog-pg-operator.html\"\u003e查看完整中文手册与上下文\u003c/a\u003e。\u003c/p\u003e\u003cp\u003e本页开头的中文说明为 PG.CENTER 对源码说明的翻译；手册节选保留对应版本中文文档原文。源码信息及手册示例不代表重新进行过运行测试。\u003c/p\u003e","facts":[{"label":"Left operand","value":"lseg"},{"label":"Right operand","value":"lseg"},{"label":"Result type","value":"point"},{"label":"Implementing function","value":"close_lseg(lseg,lseg)"},{"label":"Operator kind","value":"Binary"},{"label":"Hash join candidate","value":"no"},{"label":"Merge join candidate","value":"no"}],"facts_zh":[{"label":"左操作数","value":"lseg"},{"label":"右操作数","value":"lseg"},{"label":"返回类型","value":"point"},{"label":"实现函数","value":"close_lseg(lseg,lseg)"},{"label":"操作符种类","value":"Binary"},{"label":"可用于哈希连接","value":"否"},{"label":"可用于归并连接","value":"否"}],"manual_semantics":"Source catalog description; no additional matching manual operator definition claimed","memberships":[],"operator":{"commutator":"","function":"close_lseg(lseg,lseg)","hash_join":"f","kind":"b","left_type":"lseg","merge_join":"f","negator":"","result_type":"point","right_type":"lseg","symbol":"##"},"related":[{"label":"lseg data type","url":"/wiki/type/lseg/?v=18"},{"label":"point data type","url":"/wiki/type/point/?v=18"}],"release":{"catalog_fingerprint":"deec62e0f0c649d9d0d058ddd0b16bf41afffd569c3fd73949ff0971ce5cabd6","channel":"stable","label":"18.6","major":"18","manual_fingerprint":"fefce9e478eb2afe5e17e869492bbedc67dce23d317f0a5257240113d6496ebc","ref":"https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2","revision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","source_sha256":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"},"sections":[{"paragraphs":["The catalog pg_operator stores information about operators. 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