mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2024-11-27 07:21:09 +08:00
Code Issues Packages Projects Releases Wiki Activity

Avoid reversing user-given order of WHERE clauses while attaching clauses

Browse Source 
to specific base or join RelOptInfo nodes during planning.  This preserves
the more-intuitive behavior of 7.0.* --- if you write an expensive clause
(such as a sub-select) last, it should get evaluated last.  Someday we
ought to try to have some intelligence about the order of evaluation of
WHERE clauses, but for now we should not override what the user wrote.
This commit is contained in:
Tom Lane 2001-04-16 19:44:10 +00:00
parent 722f7efdd9
commit cdcaec5c53
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/backend/optimizer/plan/initsplan.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/initsplan.c,v 1.58 2001/03/22 03:59:36 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/initsplan.c,v 1.59 2001/04/16 19:44:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -444,8 +444,8 @@ distribute_qual_to_rels(Query *root, Node *clause,
*/
RelOptInfo *rel = get_base_rel(root, lfirsti(relids));
rel->baserestrictinfo = lcons(restrictinfo,
rel->baserestrictinfo);
rel->baserestrictinfo = lappend(rel->baserestrictinfo,
restrictinfo);
/*
* Check for a "mergejoinable" clause even though it's not a join
@ -549,8 +549,8 @@ add_join_info_to_rels(Query *root, RestrictInfo *restrictinfo,
*/
joininfo = find_joininfo_node(get_base_rel(root, cur_relid),
unjoined_relids);
joininfo->jinfo_restrictinfo = lcons(restrictinfo,
joininfo->jinfo_restrictinfo);
joininfo->jinfo_restrictinfo = lappend(joininfo->jinfo_restrictinfo,
restrictinfo);
}
}