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When building a bitmap scan, must copy the bitmapqualorig expression tree

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to avoid sharing substructure with the lower-level indexquals.  This is
currently only an issue if there are SubPlans in the indexquals, which is
uncommon but not impossible --- see bug #2218 reported by Nicholas Vinen.
We use the same kluge for indexqual vs indexqualorig in the index scans
themselves ... would be nice to clean this up someday.
This commit is contained in:
Tom Lane 2006-01-29 18:55:48 +00:00
parent 3edec383e1
commit 3276e911d1
1 changed files with 7 additions and 1 deletions
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8
src/backend/optimizer/plan/createplan.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.206 2006/01/25 20:29:23 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.207 2006/01/29 18:55:48 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -963,6 +963,12 @@ create_bitmap_scan_plan(PlannerInfo *root,
*/
bitmapqualorig = list_difference_ptr(bitmapqualorig, qpqual);
/*
* Copy the finished bitmapqualorig to make sure we have an independent
* copy --- needed in case there are subplans in the index quals
*/
bitmapqualorig = copyObject(bitmapqualorig);
/* Finally ready to build the plan node */
scan_plan = make_bitmap_heapscan(tlist,
qpqual,