<?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>52.5. pg_amproc</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="catalog-pg-amop.html" title="52.4. pg_amop" /><link rel="next" href="catalog-pg-attrdef.html" title="52.6. pg_attrdef" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">52.5. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_amproc</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-amop.html" title="52.4. pg_amop">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 52. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 52. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-attrdef.html" title="52.6. pg_attrdef">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="CATALOG-PG-AMPROC"><div class="titlepage"><div><div><h2 class="title" style="clear: both">52.5. <code class="structname">pg_amproc</code></h2></div></div></div><a id="id-1.10.4.7.2" class="indexterm"></a><p> The catalog <code class="structname">pg_amproc</code> stores information about support functions associated with access method operator families. There is one row for each support function belonging to an operator family. </p><div class="table" id="id-1.10.4.7.4"><p class="title"><strong>Table 52.5. <code class="structname">pg_amproc</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_amproc Columns" border="1"><colgroup><col /><col /><col /><col /></colgroup><thead><tr><th>Name</th><th>Type</th><th>References</th><th>Description</th></tr></thead><tbody><tr><td><code class="structfield">oid</code></td><td><code class="type">oid</code></td><td> </td><td>Row identifier (hidden attribute; must be explicitly selected)</td></tr><tr><td><code class="structfield">amprocfamily</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-opfamily.html" title="52.35. pg_opfamily"><code class="structname">pg_opfamily</code></a>.oid</code></td><td>The operator family this entry is for</td></tr><tr><td><code class="structfield">amproclefttype</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-type.html" title="52.62. pg_type"><code class="structname">pg_type</code></a>.oid</code></td><td>Left-hand input data type of associated operator</td></tr><tr><td><code class="structfield">amprocrighttype</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-type.html" title="52.62. pg_type"><code class="structname">pg_type</code></a>.oid</code></td><td>Right-hand input data type of associated operator</td></tr><tr><td><code class="structfield">amprocnum</code></td><td><code class="type">int2</code></td><td> </td><td>Support function number</td></tr><tr><td><code class="structfield">amproc</code></td><td><code class="type">regproc</code></td><td><code class="literal"><a class="link" href="catalog-pg-proc.html" title="52.39. pg_proc"><code class="structname">pg_proc</code></a>.oid</code></td><td>OID of the function</td></tr></tbody></table></div></div><br class="table-break" /><p> The usual interpretation of the <code class="structfield">amproclefttype</code> and <code class="structfield">amprocrighttype</code> fields is that they identify the left and right input types of the operator(s) that a particular support function supports. For some access methods these match the input data type(s) of the support function itself, for others not. There is a notion of <span class="quote">“<span class="quote">default</span>”</span> support functions for an index, which are those with <code class="structfield">amproclefttype</code> and <code class="structfield">amprocrighttype</code> both equal to the index operator class's <code class="structfield">opcintype</code>. </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="catalog-pg-amop.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-attrdef.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">52.4. <code class="structname">pg_amop</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 52.6. <code class="structname">pg_attrdef</code></td></tr></table></div></body></html>
