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Add unique index on pg_cast.oid, and document pg_cast table.

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This commit is contained in:
Peter Eisentraut
2002-07-22 20:23:19 +00:00
parent a7ffd69d4c
commit e9c013f4bd
4 changed files with 86 additions and 15 deletions
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66
doc/src/sgml/catalogs.sgml
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@ -1,6 +1,6 @@
<!--
Documentation of the system catalogs, directed toward PostgreSQL developers
$Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.45 2002/07/12 18:43:12 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.46 2002/07/22 20:23:19 petere Exp $
-->
<chapter id="catalogs">
@ -66,6 +66,11 @@
<entry>table columns (<quote>attributes</quote>, <quote>fields</quote>)</entry>
</row>
<row>
<entry>pg_cast</entry>
<entry>casts (data type conversions)</entry>
</row>
<row>
<entry>pg_class</entry>
<entry>tables, indexes, sequences (<quote>relations</quote>)</entry>
@ -519,6 +524,65 @@
</sect1>
<sect1 id="catalog-pg-cast">
<title>pg_cast</title>
<para>
<structname>pg_cast</structname> stores data type conversion paths
defined with <command>CREATE CAST</command> plus the built-in
conversions.
</para>
<table>
<title>pg_cast Columns</title>
<tgroup cols=4>
<thead>
<row>
<entry>Name</entry>
<entry>Type</entry>
<entry>References</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry>castsource</entry>
<entry><type>oid</type></entry>
<entry>pg_type.oid</entry>
<entry>OID of the source data type</entry>
</row>
<row>
<entry>casttarget</entry>
<entry><type>oid</type></entry>
<entry>pg_type.oid</entry>
<entry>OID of the target data type</entry>
</row>
<row>
<entry>castfunc</entry>
<entry><type>oid</type></entry>
<entry>pg_proc.oid</entry>
<entry>
The OID of the function to use to perform this cast. A 0 is
stored if the data types are binary compatible (that is, no
function is needed to perform the cast).
</entry>
</row>
<row>
<entry>castimplicit</entry>
<entry><type>bool</type></entry>
<entry></entry>
<entry>Indication whether this cast can be invoked implicitly</entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="catalog-pg-class">
<title>pg_class</title>