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Bug (yet unfixed but not fatal) found: Re-moving index clauses from the 

nestloop's join clauses doesn't work in some cases:
         *    1. fix_indxqual_references may change varattno-s in
         *       inner_indxqual;
         *    2. clauses may be commuted
This commit is contained in:
Vadim B. Mikheev 1997-04-24 15:59:58 +00:00
parent a1ac1989cf
commit e349eb6e2c
1 changed files with 9 additions and 3 deletions
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12
src/backend/optimizer/plan/createplan.c
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@ -7,7 +7,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.10 1997/04/22 03:30:36 vadim Exp $ * $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.11 1997/04/24 15:59:58 vadim Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -432,7 +432,7 @@ create_nestloop_node(JoinPath *best_path,
foreach (inner_qual, inner_indxqual) foreach (inner_qual, inner_indxqual)
{ {
if ( !(qual_clause_p ((Node*)inner_qual)) ) if ( !qual_clause_p ((Node*)lfirst(inner_qual)) )
{ {
found = true; found = true;
break; break;
@ -443,12 +443,18 @@ create_nestloop_node(JoinPath *best_path,
* index clauses from the nestloop's join clauses and reset the * index clauses from the nestloop's join clauses and reset the
* inner(index) scan's qualification so that the var nodes refer to * inner(index) scan's qualification so that the var nodes refer to
* the proper outer join relation attributes. * the proper outer join relation attributes.
*
* XXX Re-moving index clauses doesn't work properly:
* 1. fix_indxqual_references may change varattno-s in
* inner_indxqual;
* 2. clauses may be commuted
* I havn't time to fix it at the moment. - vadim 04/24/97
*/ */
if ( found ) if ( found )
{ {
List *new_inner_qual = NIL; List *new_inner_qual = NIL;
clauses = set_difference(clauses,inner_indxqual); clauses = set_difference(clauses,inner_indxqual); /* XXX */
new_inner_qual = new_inner_qual =
index_outerjoin_references(inner_indxqual, index_outerjoin_references(inner_indxqual,
outer_node->targetlist, outer_node->targetlist,