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Add comments about STORAGE option for GIN

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This commit is contained in:
Teodor Sigaev 2006-09-21 15:09:38 +00:00
parent 823ffd88e3
commit b0d64a090b
1 changed files with 4 additions and 3 deletions
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7
doc/src/sgml/xindex.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/xindex.sgml,v 1.50 2006/09/21 15:03:53 teodor Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/xindex.sgml,v 1.51 2006/09/21 15:09:38 teodor Exp $ -->
<sect1 id="xindex">
<title>Interfacing Extensions To Indexes</title>
@ -822,11 +822,12 @@ CREATE OPERATOR CLASS polygon_ops
STORAGE box;
</programlisting>
At present, only the GiST index method supports a
At present, only the GiST and GIN index method supports a
<literal>STORAGE</> type that's different from the column data type.
The GiST <literal>compress</> and <literal>decompress</> support
routines must deal with data-type conversion when <literal>STORAGE</>
is used.
is used. Functions named <literal>extractValue</> and <literal>extractQuery</>
do conversation into internally used types for GIN.
</para>
</sect2>