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diff --git a/doc/src/sgml/html/catalog-pg-opclass.html b/doc/src/sgml/html/catalog-pg-opclass.html new file mode 100644 index 0000000..536977a --- /dev/null +++ b/doc/src/sgml/html/catalog-pg-opclass.html @@ -0,0 +1,75 @@ +<?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>51.33. pg_opclass</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 V1.79.1" /><link rel="prev" href="catalog-pg-namespace.html" title="51.32. pg_namespace" /><link rel="next" href="catalog-pg-operator.html" title="51.34. pg_operator" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">51.33. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_opclass</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-namespace.html" title="51.32. pg_namespace">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 51. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 51. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-operator.html" title="51.34. pg_operator">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="CATALOG-PG-OPCLASS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">51.33. <code class="structname">pg_opclass</code></h2></div></div></div><a id="id-1.10.4.35.2" class="indexterm"></a><p> + The catalog <code class="structname">pg_opclass</code> defines + index access method operator classes. Each operator class defines + semantics for index columns of a particular data type and a particular + index access method. An operator class essentially specifies that a + particular operator family is applicable to a particular indexable column + data type. The set of operators from the family that are actually usable + with the indexed column are whichever ones accept the column's data type + as their left-hand input. + </p><p> + Operator classes are described at length in <a class="xref" href="xindex.html" title="37.16. Interfacing Extensions to Indexes">Section 37.16</a>. + </p><div class="table" id="id-1.10.4.35.5"><p class="title"><strong>Table 51.33. <code class="structname">pg_opclass</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_opclass Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition"> + Column Type + </p> + <p> + Description + </p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">oid</code> <code class="type">oid</code> + </p> + <p> + Row identifier + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">opcmethod</code> <code class="type">oid</code> + (references <a class="link" href="catalog-pg-am.html" title="51.3. pg_am"><code class="structname">pg_am</code></a>.<code class="structfield">oid</code>) + </p> + <p> + Index access method operator class is for + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">opcname</code> <code class="type">name</code> + </p> + <p> + Name of this operator class + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">opcnamespace</code> <code class="type">oid</code> + (references <a class="link" href="catalog-pg-namespace.html" title="51.32. pg_namespace"><code class="structname">pg_namespace</code></a>.<code class="structfield">oid</code>) + </p> + <p> + Namespace of this operator class + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">opcowner</code> <code class="type">oid</code> + (references <a class="link" href="catalog-pg-authid.html" title="51.8. pg_authid"><code class="structname">pg_authid</code></a>.<code class="structfield">oid</code>) + </p> + <p> + Owner of the operator class + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">opcfamily</code> <code class="type">oid</code> + (references <a class="link" href="catalog-pg-opfamily.html" title="51.35. pg_opfamily"><code class="structname">pg_opfamily</code></a>.<code class="structfield">oid</code>) + </p> + <p> + Operator family containing the operator class + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">opcintype</code> <code class="type">oid</code> + (references <a class="link" href="catalog-pg-type.html" title="51.62. pg_type"><code class="structname">pg_type</code></a>.<code class="structfield">oid</code>) + </p> + <p> + Data type that the operator class indexes + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">opcdefault</code> <code class="type">bool</code> + </p> + <p> + True if this operator class is the default for <code class="structfield">opcintype</code> + </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition"> + <code class="structfield">opckeytype</code> <code class="type">oid</code> + (references <a class="link" href="catalog-pg-type.html" title="51.62. pg_type"><code class="structname">pg_type</code></a>.<code class="structfield">oid</code>) + </p> + <p> + Type of data stored in index, or zero if same as <code class="structfield">opcintype</code> + </p></td></tr></tbody></table></div></div><br class="table-break" /><p> + An operator class's <code class="structfield">opcmethod</code> must match the + <code class="structname">opfmethod</code> of its containing operator family. + Also, there must be no more than one <code class="structname">pg_opclass</code> + row having <code class="structname">opcdefault</code> true for any given combination of + <code class="structname">opcmethod</code> and <code class="structname">opcintype</code>. + </p></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="catalog-pg-namespace.html" title="51.32. pg_namespace">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html" title="Chapter 51. System Catalogs">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-operator.html" title="51.34. pg_operator">Next</a></td></tr><tr><td width="40%" align="left" valign="top">51.32. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_namespace</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 51.34. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_operator</code></td></tr></table></div></body></html>
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