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Tweak nodeBitmapAnd to stop evaluating sub-plan scans if it finds it's

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got an empty bitmap after any step; the remaining subplans can no longer
affect the result.  Per a suggestion from Ilia Kantor.
This commit is contained in:
Tom Lane
2005-08-28 22:47:20 +00:00
parent 75e90bbf69
commit 46a0eee300
4 changed files with 30 additions and 4 deletions
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7
src/backend/optimizer/path/indxpath.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/indxpath.c,v 1.187 2005/07/28 20:26:20 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/indxpath.c,v 1.188 2005/08/28 22:47:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -538,6 +538,11 @@ choose_bitmap_and(PlannerInfo *root, RelOptInfo *rel, List *paths)
* cases, the partial index will sort before competing non-partial
* indexes and so it makes the right choice, but perhaps we need to
* work harder.
*
* Note: outputting the selected sub-paths in selectivity order is a good
* thing even if we weren't using that as part of the selection method,
* because it makes the short-circuit case in MultiExecBitmapAnd() more
* likely to apply.
*/
/* Convert list to array so we can apply qsort */