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Commitb307d7a

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Fix planning of SubLinks to ensure that Vars generated from transformation of
a sublink's test expression have the correct vartypmod, rather than defaultingto -1. There's at least one place where this is important because we'reexpecting these Vars to be exactly equal() to those appearing in the subplanitself. This is a pretty klugy solution --- it would likely be cleaner tochange Param nodes to include a typmod field --- but we can't do that in thealready-released 8.2 branch.Per bug report from Hubert Fongarnand.
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‎src/backend/optimizer/plan/subselect.c

Lines changed: 31 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1994, Regents of the University of California
88
*
99
* IDENTIFICATION
10-
* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.112 2006/10/04 00:29:54 momjian Exp $
10+
* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.113 2006/12/06 19:40:01 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -75,6 +75,7 @@ typedef struct convert_testexpr_context
7575
{
7676
intrtindex;/* RT index for Vars, or 0 for Params */
7777
List*righthandIds;/* accumulated list of Vars or Param IDs */
78+
List*sub_tlist;/* subselect targetlist (if given) */
7879
}convert_testexpr_context;
7980

8081
typedefstructfinalize_primnode_context
@@ -86,7 +87,8 @@ typedef struct finalize_primnode_context
8687

8788
staticNode*convert_testexpr(Node*testexpr,
8889
intrtindex,
89-
List**righthandIds);
90+
List**righthandIds,
91+
List*sub_tlist);
9092
staticNode*convert_testexpr_mutator(Node*node,
9193
convert_testexpr_context*context);
9294
staticboolsubplan_is_hashable(SubLink*slink,SubPlan*node);
@@ -379,7 +381,8 @@ make_subplan(SubLink *slink, Node *testexpr, bool isTopQual)
379381
/* Adjust the Params */
380382
result=convert_testexpr(testexpr,
381383
0,
382-
&node->paramIds);
384+
&node->paramIds,
385+
NIL);
383386
node->setParam=list_copy(node->paramIds);
384387
PlannerInitPlan=lappend(PlannerInitPlan,node);
385388

@@ -396,7 +399,8 @@ make_subplan(SubLink *slink, Node *testexpr, bool isTopQual)
396399
/* Adjust the Params */
397400
node->testexpr=convert_testexpr(testexpr,
398401
0,
399-
&node->paramIds);
402+
&node->paramIds,
403+
NIL);
400404

401405
/*
402406
* We can't convert subplans of ALL_SUBLINK or ANY_SUBLINK types to
@@ -470,6 +474,10 @@ make_subplan(SubLink *slink, Node *testexpr, bool isTopQual)
470474
* of the Var nodes are returned in *righthandIds (this is a bit of a type
471475
* cheat, but we can get away with it).
472476
*
477+
* The subquery targetlist need be supplied only if rtindex is not 0.
478+
* We consult it to extract the correct typmods for the created Vars.
479+
* (XXX this is a kluge that could go away if Params carried typmod.)
480+
*
473481
* The given testexpr has already been recursively processed by
474482
* process_sublinks_mutator. Hence it can no longer contain any
475483
* PARAM_SUBLINK Params for lower SubLink nodes; we can safely assume that
@@ -478,13 +486,15 @@ make_subplan(SubLink *slink, Node *testexpr, bool isTopQual)
478486
staticNode*
479487
convert_testexpr(Node*testexpr,
480488
intrtindex,
481-
List**righthandIds)
489+
List**righthandIds,
490+
List*sub_tlist)
482491
{
483492
Node*result;
484493
convert_testexpr_contextcontext;
485494

486495
context.rtindex=rtindex;
487496
context.righthandIds=NIL;
497+
context.sub_tlist=sub_tlist;
488498
result=convert_testexpr_mutator(testexpr,&context);
489499
*righthandIds=context.righthandIds;
490500
returnresult;
@@ -516,10 +526,23 @@ convert_testexpr_mutator(Node *node,
516526
/* Make the Var node representing the subplan's result */
517527
Var*newvar;
518528

529+
/*
530+
* XXX kluge: since Params don't carry typmod, we have to
531+
* look into the subquery targetlist to find out the right
532+
* typmod to assign to the Var.
533+
*/
534+
TargetEntry*ste=get_tle_by_resno(context->sub_tlist,
535+
param->paramid);
536+
537+
if (ste==NULL||ste->resjunk)
538+
elog(ERROR,"subquery output %d not found",
539+
param->paramid);
540+
Assert(param->paramtype==exprType((Node*)ste->expr));
541+
519542
newvar=makeVar(context->rtindex,
520543
param->paramid,
521544
param->paramtype,
522-
-1,
545+
exprTypmod((Node*)ste->expr),
523546
0);
524547

525548
/*
@@ -752,7 +775,8 @@ convert_IN_to_join(PlannerInfo *root, SubLink *sublink)
752775
*/
753776
returnconvert_testexpr(sublink->testexpr,
754777
rtindex,
755-
&ininfo->sub_targetlist);
778+
&ininfo->sub_targetlist,
779+
subselect->targetList);
756780
}
757781

758782
/*

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