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Fix oversight in construction of sort/unique plans for UniquePaths.

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If the original IN operator is cross-type, for example int8 = int4,
we need to use int4 < int4 to sort the inner data and int4 = int4
to unique-ify it.  We got the first part of that right, but tried to
use the original IN operator for the equality checks.  Per bug #5472
from Vlad Romascanu.

Backpatch to 8.4, where the bug was introduced by the patch that unified
SortClause and GroupClause.  I was able to take out a whole lot of on-the-fly
calls of get_equality_op_for_ordering_op(), but failed to realize that
I needed to put one back in right here :-(
This commit is contained in:
Tom Lane 2010-05-25 17:44:47 +00:00
parent 0870648c2f
commit bb6e270ae3
1 changed files with 16 additions and 2 deletions
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18
src/backend/optimizer/plan/createplan.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.260.2.1 2009/07/17 23:19:59 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.260.2.2 2010/05/25 17:44:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -784,6 +784,7 @@ create_unique_plan(PlannerInfo *root, UniquePath *best_path)
{
Oid in_oper = lfirst_oid(l);
Oid sortop;
Oid eqop;
TargetEntry *tle;
SortGroupClause *sortcl;
@ -791,13 +792,26 @@ create_unique_plan(PlannerInfo *root, UniquePath *best_path)
if (!OidIsValid(sortop)) /* shouldn't happen */
elog(ERROR, "could not find ordering operator for equality operator %u",
in_oper);
/*
* The Unique node will need equality operators. Normally these
* are the same as the IN clause operators, but if those are
* cross-type operators then the equality operators are the ones
* for the IN clause operators' RHS datatype.
*/
eqop = get_equality_op_for_ordering_op(sortop, NULL);
if (!OidIsValid(eqop)) /* shouldn't happen */
elog(ERROR, "could not find equality operator for ordering operator %u",
sortop);
tle = get_tle_by_resno(subplan->targetlist,
groupColIdx[groupColPos]);
Assert(tle != NULL);
sortcl = makeNode(SortGroupClause);
sortcl->tleSortGroupRef = assignSortGroupRef(tle,
subplan->targetlist);
sortcl->eqop = in_oper;
sortcl->eqop = eqop;
sortcl->sortop = sortop;
sortcl->nulls_first = false;
sortList = lappend(sortList, sortcl);