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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2005-08-28 22:47:20 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2005-08-28 22:47:20 +0000 |
| commit | 46a0eee3006b11a15b73426c8146ed5ab32e1d62 (patch) | |
| tree | 84e646e836446437c7fd310fd0aaf167b561e4dc /src/include/nodes/tidbitmap.h | |
| parent | 75e90bbf69efb3cee8d3af9c07d345dd9540a7cc (diff) | |
| download | postgresql-46a0eee3006b11a15b73426c8146ed5ab32e1d62.tar.gz | |
Tweak nodeBitmapAnd to stop evaluating sub-plan scans if it finds it's
got an empty bitmap after any step; the remaining subplans can no longer
affect the result. Per a suggestion from Ilia Kantor.
Diffstat (limited to 'src/include/nodes/tidbitmap.h')
| -rw-r--r-- | src/include/nodes/tidbitmap.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/include/nodes/tidbitmap.h b/src/include/nodes/tidbitmap.h index 2c90c01d81..ea5673e6f2 100644 --- a/src/include/nodes/tidbitmap.h +++ b/src/include/nodes/tidbitmap.h @@ -15,7 +15,7 @@ * * Copyright (c) 2003-2005, PostgreSQL Global Development Group * - * $PostgreSQL: pgsql/src/include/nodes/tidbitmap.h,v 1.1 2005/04/17 22:24:02 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/tidbitmap.h,v 1.2 2005/08/28 22:47:20 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -49,6 +49,8 @@ extern void tbm_add_tuples(TIDBitmap *tbm, const ItemPointer tids, int ntids); extern void tbm_union(TIDBitmap *a, const TIDBitmap *b); extern void tbm_intersect(TIDBitmap *a, const TIDBitmap *b); +extern bool tbm_is_empty(const TIDBitmap *tbm); + extern void tbm_begin_iterate(TIDBitmap *tbm); extern TBMIterateResult *tbm_iterate(TIDBitmap *tbm); |