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<!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>51.5. 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 V1.79.1" /><link rel="prev" href="catalog-pg-amop.html" title="51.4. pg_amop" /><link rel="next" href="catalog-pg-attrdef.html" title="51.6. pg_attrdef" /></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">51.5. <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="51.4. pg_amop">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-attrdef.html" title="51.6. 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">51.5. <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 51.5. <code class="structname">pg_amproc</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_amproc Columns" border="1"><colgroup><col /></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">amprocfamily</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>
The operator family this entry is for
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">amproclefttype</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>
Left-hand input data type of associated operator
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">amprocrighttype</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>
Right-hand input data type of associated operator
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">amprocnum</code> <code class="type">int2</code>
</p>
<p>
Support function number
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">amproc</code> <code class="type">regproc</code>
(references <a class="link" href="catalog-pg-proc.html" title="51.38. pg_proc"><code class="structname">pg_proc</code></a>.<code class="structfield">oid</code>)
</p>
<p>
OID of the function
</p></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 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-amop.html" title="51.4. pg_amop">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-attrdef.html" title="51.6. pg_attrdef">Next</a></td></tr><tr><td width="40%" align="left" valign="top">51.4. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_amop</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"> 51.6. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_attrdef</code></td></tr></table></div></body></html>
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