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Multi-column GIN indexes. Teodor Sigaev

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This commit is contained in:
Tom Lane
2008-07-11 21:06:29 +00:00
parent 2d6599f471
commit 27cb66fdfe
15 changed files with 465 additions and 182 deletions
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6
doc/src/sgml/ref/create_index.sgml
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@@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/create_index.sgml,v 1.67 2008/03/16 23:57:51 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/create_index.sgml,v 1.68 2008/07/11 21:06:29 tgl Exp $
PostgreSQL documentation
-->
@@ -394,7 +394,7 @@ Indexes:
</para>
<para>
Currently, only the B-tree and GiST index methods support
Currently, only the B-tree, GiST and GIN index methods support
multicolumn indexes. Up to 32 fields can be specified by default.
(This limit can be altered when building
<productname>PostgreSQL</productname>.) Only B-tree currently
@@ -423,7 +423,7 @@ Indexes:
the optional clauses <literal>ASC</>, <literal>DESC</>, <literal>NULLS
FIRST</>, and/or <literal>NULLS LAST</> can be specified to reverse
the normal sort direction of the index. Since an ordered index can be
scanned either forward or backward, it is not normally useful to create a
scanned either forward or backward, it is not normally useful to create a
single-column <literal>DESC</> index &mdash; that sort ordering is already
available with a regular index. The value of these options is that
multicolumn indexes can be created that match the sort ordering requested