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Diffstat (limited to 'doc/src/sgml/xindex.sgml')
| -rw-r--r-- | doc/src/sgml/xindex.sgml | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/doc/src/sgml/xindex.sgml b/doc/src/sgml/xindex.sgml index fa9fecf5ba3..1da74b9fa3d 100644 --- a/doc/src/sgml/xindex.sgml +++ b/doc/src/sgml/xindex.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/xindex.sgml,v 1.65 2010/02/24 03:33:49 momjian Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/xindex.sgml,v 1.66 2010/02/24 15:54:31 momjian Exp $ --> <sect1 id="xindex"> <title>Interfacing Extensions To Indexes</title> @@ -895,6 +895,16 @@ ALTER OPERATOR FAMILY integer_ops USING btree ADD try to use these SQL features with the data type. </para> + <note> + <para> + In <productname>PostgreSQL</productname> versions before 7.4, + sorting and grouping operations would implicitly use operators named + <literal>=</>, <literal><</>, and <literal>></>. The new + behavior of relying on default operator classes avoids having to make + any assumption about the behavior of operators with particular names. + </para> + </note> + <para> Another important point is that an operator that appears in a hash operator family is a candidate for hash joins, |