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Make 'col IS NULL' clauses be indexable conditions.

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Teodor Sigaev, with some kibitzing from Tom Lane.
This commit is contained in:
Tom Lane
2007-04-06 22:33:43 +00:00
parent 146c83c045
commit f02a82b6ad
19 changed files with 432 additions and 110 deletions
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8
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 1.61 2007/04/03 22:38:35 momjian Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/create_index.sgml,v 1.62 2007/04/06 22:33:41 tgl Exp $
PostgreSQL documentation
-->
@@ -434,12 +434,6 @@ Indexes:
to remove an index.
</para>
<para>
Indexes are not used for <literal>IS NULL</> clauses by default.
The best way to use indexes in such cases is to create a partial index
using an <literal>IS NULL</> predicate.
</para>
<para>
Prior releases of <productname>PostgreSQL</productname> also had an
R-tree index method. This method has been removed because