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> > Prevent sorting if result is already sorted

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> >
> > was implemented by Jan Wieck.
> > His work is for ascending order cases.
> >
> > Here is a patch to prevent sorting also in descending
> > order cases.
> > Because I had already changed _bt_first() to position
> > backward correctly before v6.5,this patch would work.
> >
Hiroshi Inoue
Inoue@tpf.co.jp
This commit is contained in:
Bruce Momjian
1999-08-09 06:20:27 +00:00
parent 5efe31214a
commit 158fd5f1c4
9 changed files with 78 additions and 28 deletions
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5
src/backend/nodes/equalfuncs.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.45 1999/07/29 02:45:36 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.46 1999/08/09 06:20:24 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -437,6 +437,9 @@ _equalIndexScan(IndexScan *a, IndexScan *b)
if (a->scan.scanrelid != b->scan.scanrelid)
return false;
if (a->indxorderdir != b->indxorderdir)
return false;
if (!equali(a->indxid, b->indxid))
return false;
return true;