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Add aggsortop column to pg_aggregate, so that MIN/MAX optimization can

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be supported for all datatypes.  Add CREATE AGGREGATE and pg_dump support
too.  Add specialized min/max aggregates for bpchar, instead of depending
on text's min/max, because otherwise the possible use of bpchar indexes
cannot be recognized.
initdb forced because of catalog changes.
This commit is contained in:
Tom Lane
2005-04-12 04:26:34 +00:00
parent 3803f24379
commit 2e7a68896b
15 changed files with 356 additions and 123 deletions
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17
src/backend/optimizer/plan/planagg.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planagg.c,v 1.1 2005/04/11 23:06:55 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planagg.c,v 1.2 2005/04/12 04:26:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -542,7 +542,6 @@ replace_aggs_with_params_mutator(Node *node, List **context)
static Oid
fetch_agg_sort_op(Oid aggfnoid)
{
#ifdef NOT_YET
HeapTuple aggTuple;
Form_pg_aggregate aggform;
Oid aggsortop;
@@ -558,18 +557,4 @@ fetch_agg_sort_op(Oid aggfnoid)
ReleaseSysCache(aggTuple);
return aggsortop;
#else
/*
* XXX stub implementation for testing: hardwire a few cases.
*/
if (aggfnoid == 2132) /* min(int4) -> int4lt */
return 97;
if (aggfnoid == 2116) /* max(int4) -> int4gt */
return 521;
if (aggfnoid == 2145) /* min(text) -> text_lt */
return 664;
if (aggfnoid == 2129) /* max(text) -> text_gt */
return 666;
return InvalidOid;
#endif
}