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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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13
src/backend/optimizer/plan/createplan.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.223 2007/01/22 01:35:20 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.224 2007/01/30 01:33:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -716,10 +716,10 @@ create_unique_plan(PlannerInfo *root, UniquePath *best_path)
numGroups = (long) Min(best_path->rows, (double) LONG_MAX);
/*
* Get the (presumed hashable) equality operators for the Agg node
* to use. 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.
* Get the hashable equality operators for the Agg node to use.
* 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.
*/
groupOperators = (Oid *) palloc(numGroupCols * sizeof(Oid));
groupColPos = 0;
@ -728,8 +728,7 @@ create_unique_plan(PlannerInfo *root, UniquePath *best_path)
Oid in_oper = lfirst_oid(l);
Oid eq_oper;
eq_oper = get_compatible_hash_operator(in_oper, false);
if (!OidIsValid(eq_oper)) /* shouldn't happen */
if (!get_compatible_hash_operators(in_oper, NULL, &eq_oper))
elog(ERROR, "could not find compatible hash operator for operator %u",
in_oper);
groupOperators[groupColPos++] = eq_oper;