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Tighten selection of equality and ordering operators for grouping

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operations: make sure we use operators that are compatible, as determined
by a mergejoin link in pg_operator.  Also, add code to planner to ensure
we don't try to use hashed grouping when the grouping operators aren't
marked hashable.
This commit is contained in:
Tom Lane
2002-11-29 21:39:12 +00:00
parent 851a4c48fd
commit f68f11928d
8 changed files with 167 additions and 81 deletions
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8
src/backend/executor/nodeGroup.c
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@ -15,7 +15,7 @@
* locate group boundaries.
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeGroup.c,v 1.49 2002/11/06 22:31:23 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeGroup.c,v 1.50 2002/11/29 21:39:11 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -353,11 +353,7 @@ execTuplesMatchPrepare(TupleDesc tupdesc,
Oid typid = tupdesc->attrs[att - 1]->atttypid;
Oid eq_function;
eq_function = compatible_oper_funcid(makeList1(makeString("=")),
typid, typid, true);
if (!OidIsValid(eq_function))
elog(ERROR, "Unable to identify an equality operator for type %s",
format_type_be(typid));
eq_function = equality_oper_funcid(typid);
fmgr_info(eq_function, &eqfunctions[i]);
}