database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-27 00:12:01 +03:00
Code Activity

Create the planner mechanism for optimizing simple MIN and MAX queries

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

4
src/include/optimizer/subselect.h
View File

@@ -5,7 +5,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.23 2004/12/31 22:03:36 pgsql Exp $
* $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.24 2005/04/11 23:06:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -24,5 +24,7 @@ extern Node *convert_IN_to_join(Query *parse, SubLink *sublink);
extern Node *SS_replace_correlation_vars(Node *expr);
extern Node *SS_process_sublinks(Node *expr, bool isQual);
extern void SS_finalize_plan(Plan *plan, List *rtable);
extern Param *SS_make_initplan_from_plan(Query *root, Plan *plan,
Oid resulttype, int32 resulttypmod);
#endif /* SUBSELECT_H */