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Create the planner mechanism for optimizing simple MIN and MAX queries

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into indexscans on matching indexes.  For the moment, it only handles
int4 and text datatypes; next step is to add a column to pg_aggregate
so that all MIN/MAX aggregates can be handled.  Per my recent proposal.
This commit is contained in:
Tom Lane
2005-04-11 23:06:57 +00:00
parent c3294f1cbf
commit addc42c339
14 changed files with 983 additions and 204 deletions
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27
src/backend/utils/cache/lsyscache.c vendored
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/lsyscache.c,v 1.122 2005/03/31 22:46:14 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/lsyscache.c,v 1.123 2005/04/11 23:06:56 tgl Exp $
*
* NOTES
* Eventually, the index information should go through here, too.
@ -53,6 +53,31 @@ op_in_opclass(Oid opno, Oid opclass)
0, 0);
}
/*
* get_op_opclass_strategy
*
* Get the operator's strategy number within the specified opclass,
* or 0 if it's not a member of the opclass.
*/
int
get_op_opclass_strategy(Oid opno, Oid opclass)
{
HeapTuple tp;
Form_pg_amop amop_tup;
int result;
tp = SearchSysCache(AMOPOPID,
ObjectIdGetDatum(opno),
ObjectIdGetDatum(opclass),
0, 0);
if (!HeapTupleIsValid(tp))
return 0;
amop_tup = (Form_pg_amop) GETSTRUCT(tp);
result = amop_tup->amopstrategy;
ReleaseSysCache(tp);
return result;
}
/*
* get_op_opclass_properties
*