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

Extend set-operation planning to keep track of the sort ordering induced

Browse Source 
by the set operation, so that redundant sorts at higher levels can be
avoided.  This was foreseen a good while back, but not done.  Per request
from Karel Zak.
This commit is contained in:
Tom Lane
2004-04-07 18:17:25 +00:00
parent 5d1af6aee3
commit 989067bd22
3 changed files with 63 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.43 2003/12/28 21:57:37 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.44 2004/04/07 18:17:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -48,7 +48,7 @@ extern List *preprocess_targetlist(List *tlist, int command_type,
/*
* prototypes for prepunion.c
*/
extern Plan *plan_set_operations(Query *parse);
extern Plan *plan_set_operations(Query *parse, List **sortClauses);
extern List *find_all_inheritors(Oid parentrel);