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Build HashState's hashkeys expression with the correct parent. 

Previously the expressions were built with the HashJoinState as a
parent. That's incorrect.

Currently this does not appear to be harmful, but for the upcoming
'slot abstraction' work this proves to be problematic, as the
underlying slot types can differ between Hash and HashJoin.  It's
possible that this already causes a problem, but I've not been able to
come up with a scenario.  Therefore don't backpatch at this point.

Author: Andres Freund
Discussion: https://postgr.es/m/20180220224318.gw4oe5jadhpmcdnm@alap3.anarazel.de
This commit is contained in:
Andres Freund 2018-11-07 09:25:54 -08:00
parent da906766cd
commit 5f32b29c18
1 changed files with 5 additions and 1 deletions
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6
src/backend/executor/nodeHashjoin.c
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@ -595,6 +595,7 @@ ExecInitHashJoin(HashJoin *node, EState *estate, int eflags)
Hash *hashNode;
List *lclauses;
List *rclauses;
List *rhclauses;
List *hoperators;
TupleDesc outerDesc,
innerDesc;
@ -726,6 +727,7 @@ ExecInitHashJoin(HashJoin *node, EState *estate, int eflags)
*/
lclauses = NIL;
rclauses = NIL;
rhclauses = NIL;
hoperators = NIL;
foreach(l, node->hashclauses)
{
@ -735,13 +737,15 @@ ExecInitHashJoin(HashJoin *node, EState *estate, int eflags)
(PlanState *) hjstate));
rclauses = lappend(rclauses, ExecInitExpr(lsecond(hclause->args),
(PlanState *) hjstate));
rhclauses = lappend(rhclauses, ExecInitExpr(lsecond(hclause->args),
innerPlanState(hjstate)));
hoperators = lappend_oid(hoperators, hclause->opno);
}
hjstate->hj_OuterHashKeys = lclauses;
hjstate->hj_InnerHashKeys = rclauses;
hjstate->hj_HashOperators = hoperators;
/* child Hash node needs to evaluate inner hash keys, too */
((HashState *) innerPlanState(hjstate))->hashkeys = rclauses;
((HashState *) innerPlanState(hjstate))->hashkeys = rhclauses;
hjstate->hj_JoinState = HJ_BUILD_HASHTABLE;
hjstate->hj_MatchedOuter = false;