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Add support for cross-type hashing in hash index searches and hash joins.

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Hashing for aggregation purposes still needs work, so it's not time to
mark any cross-type operators as hashable for general use, but these cases
work if the operators are so marked by hand in the system catalogs.
This commit is contained in:
Tom Lane
2007-01-30 01:33:36 +00:00
parent e8cd6f14a2
commit a635c08fa1
12 changed files with 240 additions and 82 deletions
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15
src/backend/executor/nodeSubplan.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeSubplan.c,v 1.82 2007/01/05 22:19:28 momjian Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeSubplan.c,v 1.83 2007/01/30 01:33:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -792,7 +792,8 @@ ExecInitSubPlan(SubPlanState *node, EState *estate, int eflags)
Expr *expr;
TargetEntry *tle;
GenericExprState *tlestate;
Oid hashfn;
Oid left_hashfn;
Oid right_hashfn;
Assert(IsA(fstate, FuncExprState));
Assert(IsA(opexpr, OpExpr));
@ -830,12 +831,14 @@ ExecInitSubPlan(SubPlanState *node, EState *estate, int eflags)
fmgr_info(opexpr->opfuncid, &node->eqfunctions[i - 1]);
node->eqfunctions[i - 1].fn_expr = (Node *) opexpr;
/* Lookup the associated hash function */
hashfn = get_op_hash_function(opexpr->opno);
if (!OidIsValid(hashfn))
/* Lookup the associated hash functions */
if (!get_op_hash_functions(opexpr->opno,
&left_hashfn, &right_hashfn))
elog(ERROR, "could not find hash function for hash operator %u",
opexpr->opno);
fmgr_info(hashfn, &node->hashfunctions[i - 1]);
/* For the moment, not supporting cross-type cases */
Assert(left_hashfn == right_hashfn);
fmgr_info(right_hashfn, &node->hashfunctions[i - 1]);
i++;
}