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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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3
src/include/utils/lsyscache.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/lsyscache.h,v 1.96 2005/03/31 22:46:27 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/lsyscache.h,v 1.97 2005/04/11 23:06:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -25,6 +25,7 @@ typedef enum IOFuncSelector
} IOFuncSelector;
extern bool op_in_opclass(Oid opno, Oid opclass);
extern int get_op_opclass_strategy(Oid opno, Oid opclass);
extern void get_op_opclass_properties(Oid opno, Oid opclass,
int *strategy, Oid *subtype,
bool *recheck);