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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 13:44:03 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 13:44:03 +0000 |
| commit | 293913568e6a7a86fd1479e1cff8e2ecb58d6568 (patch) | |
| tree | fc3b469a3ec5ab71b36ea97cc7aaddb838423a0c /doc/src/sgml/html/btree-gin.html | |
| parent | Initial commit. (diff) | |
| download | postgresql-16-293913568e6a7a86fd1479e1cff8e2ecb58d6568.tar.xz postgresql-16-293913568e6a7a86fd1479e1cff8e2ecb58d6568.zip | |
Adding upstream version 16.2.upstream/16.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/src/sgml/html/btree-gin.html')
| -rw-r--r-- | doc/src/sgml/html/btree-gin.html | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/doc/src/sgml/html/btree-gin.html b/doc/src/sgml/html/btree-gin.html new file mode 100644 index 0000000..764493c --- /dev/null +++ b/doc/src/sgml/html/btree-gin.html @@ -0,0 +1,38 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>F.8. btree_gin — GIN operator classes with B-tree behavior</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="bloom.html" title="F.7. bloom — bloom filter index access method" /><link rel="next" href="btree-gist.html" title="F.9. btree_gist — GiST operator classes with B-tree behavior" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">F.8. btree_gin — GIN operator classes with B-tree behavior</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="bloom.html" title="F.7. bloom — bloom filter index access method">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules and Extensions">Up</a></td><th width="60%" align="center">Appendix F. Additional Supplied Modules and Extensions</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="btree-gist.html" title="F.9. btree_gist — GiST operator classes with B-tree behavior">Next</a></td></tr></table><hr /></div><div class="sect1" id="BTREE-GIN"><div class="titlepage"><div><div><h2 class="title" style="clear: both">F.8. btree_gin — GIN operator classes with B-tree behavior <a href="#BTREE-GIN" class="id_link">#</a></h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="btree-gin.html#BTREE-GIN-EXAMPLE-USAGE">F.8.1. Example Usage</a></span></dt><dt><span class="sect2"><a href="btree-gin.html#BTREE-GIN-AUTHORS">F.8.2. Authors</a></span></dt></dl></div><a id="id-1.11.7.18.2" class="indexterm"></a><p> + <code class="filename">btree_gin</code> provides GIN operator classes that + implement B-tree equivalent behavior for the data types + <code class="type">int2</code>, <code class="type">int4</code>, <code class="type">int8</code>, <code class="type">float4</code>, + <code class="type">float8</code>, <code class="type">timestamp with time zone</code>, + <code class="type">timestamp without time zone</code>, <code class="type">time with time zone</code>, + <code class="type">time without time zone</code>, <code class="type">date</code>, <code class="type">interval</code>, + <code class="type">oid</code>, <code class="type">money</code>, <code class="type">"char"</code>, + <code class="type">varchar</code>, <code class="type">text</code>, <code class="type">bytea</code>, <code class="type">bit</code>, + <code class="type">varbit</code>, <code class="type">macaddr</code>, <code class="type">macaddr8</code>, <code class="type">inet</code>, + <code class="type">cidr</code>, <code class="type">uuid</code>, <code class="type">name</code>, <code class="type">bool</code>, + <code class="type">bpchar</code>, and all <code class="type">enum</code> types. + </p><p> + In general, these operator classes will not outperform the equivalent + standard B-tree index methods, and they lack one major feature of the + standard B-tree code: the ability to enforce uniqueness. However, + they are useful for GIN testing and as a base for developing other + GIN operator classes. Also, for queries that test both a GIN-indexable + column and a B-tree-indexable column, it might be more efficient to create + a multicolumn GIN index that uses one of these operator classes than to create + two separate indexes that would have to be combined via bitmap ANDing. + </p><p> + This module is considered <span class="quote">“<span class="quote">trusted</span>”</span>, that is, it can be + installed by non-superusers who have <code class="literal">CREATE</code> privilege + on the current database. + </p><div class="sect2" id="BTREE-GIN-EXAMPLE-USAGE"><div class="titlepage"><div><div><h3 class="title">F.8.1. Example Usage <a href="#BTREE-GIN-EXAMPLE-USAGE" class="id_link">#</a></h3></div></div></div><pre class="programlisting"> +CREATE TABLE test (a int4); +-- create index +CREATE INDEX testidx ON test USING GIN (a); +-- query +SELECT * FROM test WHERE a < 10; +</pre></div><div class="sect2" id="BTREE-GIN-AUTHORS"><div class="titlepage"><div><div><h3 class="title">F.8.2. Authors <a href="#BTREE-GIN-AUTHORS" class="id_link">#</a></h3></div></div></div><p> + Teodor Sigaev (<code class="email"><<a class="email" href="mailto:teodor@stack.net">teodor@stack.net</a>></code>) and + Oleg Bartunov (<code class="email"><<a class="email" href="mailto:oleg@sai.msu.su">oleg@sai.msu.su</a>></code>). See + <a class="ulink" href="http://www.sai.msu.su/~megera/oddmuse/index.cgi/Gin" target="_top">http://www.sai.msu.su/~megera/oddmuse/index.cgi/Gin</a> + for additional information. + </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="bloom.html" title="F.7. bloom — bloom filter index access method">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules and Extensions">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="btree-gist.html" title="F.9. btree_gist — GiST operator classes with B-tree behavior">Next</a></td></tr><tr><td width="40%" align="left" valign="top">F.7. bloom — bloom filter index access method </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="40%" align="right" valign="top"> F.9. btree_gist — GiST operator classes with B-tree behavior</td></tr></table></div></body></html>
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