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Repair bug reported by Laurent Perez: bad plan generated when UPDATE or

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DELETE of an inheritance tree references another inherited relation.
This bug has been latent since 7.1; I'm still not quite sure why 7.1 and
7.2 don't manifest it (at least, they don't crash on a simple test case).
This commit is contained in:
Tom Lane 2003-03-05 18:38:14 +00:00
parent 391eb5e5b6
commit 147fbf9c6e
1 changed files with 21 additions and 1 deletions
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22
src/backend/optimizer/plan/planner.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.148 2003/02/15 21:39:58 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.149 2003/03/05 18:38:14 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -443,6 +443,7 @@ inheritance_planner(Query *parse, List *inheritlist)
{
int parentRTindex = parse->resultRelation;
Oid parentOID = getrelid(parentRTindex, parse->rtable);
int mainrtlength = length(parse->rtable);
List *subplans = NIL;
List *tlist = NIL;
List *l;
@ -451,6 +452,7 @@ inheritance_planner(Query *parse, List *inheritlist)
{
int childRTindex = lfirsti(l);
Oid childOID = getrelid(childRTindex, parse->rtable);
int subrtlength;
Query *subquery;
Plan *subplan;
@ -461,6 +463,24 @@ inheritance_planner(Query *parse, List *inheritlist)
/* Generate plan */
subplan = grouping_planner(subquery, 0.0 /* retrieve all tuples */ );
subplans = lappend(subplans, subplan);
/*
* It's possible that additional RTEs got added to the rangetable
* due to expansion of inherited source tables (see allpaths.c).
* If so, we must copy 'em back to the main parse tree's rtable.
*
* XXX my goodness this is ugly. Really need to think about ways
* to rein in planner's habit of scribbling on its input.
*/
subrtlength = length(subquery->rtable);
if (subrtlength > mainrtlength)
{
List *subrt = subquery->rtable;
while (mainrtlength-- > 0) /* wish we had nthcdr() */
subrt = lnext(subrt);
parse->rtable = nconc(parse->rtable, subrt);
mainrtlength = subrtlength;
}
/* Save preprocessed tlist from first rel for use in Append */
if (tlist == NIL)
tlist = subplan->targetlist;