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Commitcde9f85

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Now that switch_outer processing no longer relies on being run after
join_references(), it's practical to consolidate all join_references()processing into the set_plan_references traversal in setrefs.c. Thisseems considerably cleaner than the old way where we did it for joinquals in createplan.c and for targetlists in setrefs.c.
1 parent606d4f7 commitcde9f85

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3 files changed

+136
-154
lines changed

3 files changed

+136
-154
lines changed

‎src/backend/optimizer/plan/createplan.c‎

Lines changed: 15 additions & 130 deletions
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
1010
*
1111
*
1212
* IDENTIFICATION
13-
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.130 2003/01/1519:35:40 tgl Exp $
13+
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.131 2003/01/1523:10:32 tgl Exp $
1414
*
1515
*-------------------------------------------------------------------------
1616
*/
@@ -651,20 +651,6 @@ create_functionscan_plan(Path *best_path, List *tlist, List *scan_clauses)
651651
*
652652
*JOIN METHODS
653653
*
654-
* A general note about join_references() processing in these routines:
655-
* once we have changed a Var node to refer to a subplan output rather than
656-
* the original relation, it is no longer equal() to an unmodified Var node
657-
* for the same var. So, we cannot easily compare reference-adjusted qual
658-
* clauses to clauses that have not been adjusted.Fortunately, that
659-
* doesn't seem to be necessary; all the decisions are made before we do
660-
* the reference adjustments.
661-
*
662-
* A cleaner solution would be to not call join_references() here at all,
663-
* but leave it for setrefs.c to do at the end of plan tree construction.
664-
* But some care would be needed to get setrefs.c to do the right thing with
665-
* nestloop inner indexscan quals. So, we do subplan reference adjustment
666-
* here for quals of join nodes (and *only* for quals of join nodes).
667-
*
668654
*****************************************************************************/
669655

670656
staticNestLoop*
@@ -676,95 +662,34 @@ create_nestloop_plan(Query *root,
676662
Plan*outer_plan,
677663
Plan*inner_plan)
678664
{
679-
List*outer_tlist=outer_plan->targetlist;
680-
List*inner_tlist=inner_plan->targetlist;
681665
NestLoop*join_plan;
682666

683667
if (IsA(inner_plan,IndexScan))
684668
{
685669
/*
686670
* An index is being used to reduce the number of tuples scanned
687671
* in the inner relation. If there are join clauses being used
688-
* with the index, we must update their outer-rel var nodes to
689-
* refer to the outer side of the join.
690-
*
691-
* We can also remove those join clauses from the list of clauses
692-
* that have to be checked as qpquals at the join node, but only
693-
* if there's just one indexscan in the inner path (otherwise,
694-
* several different sets of clauses are being ORed together).
672+
* with the index, we may remove those join clauses from the list of
673+
* clauses that have to be checked as qpquals at the join node ---
674+
* but only if there's just one indexscan in the inner path
675+
* (otherwise, several different sets of clauses are being ORed
676+
* together).
695677
*
696-
* Note: if the index is lossy, the same clauses may also be getting
697-
* checked as qpquals in the indexscan. We can still remove them
698-
* from the nestloop's qpquals, but we gotta update the outer-rel
699-
* vars in the indexscan's qpquals too.
700-
*
701-
* Note: we can safely do set_difference() against my clauses and
702-
* join_references() because the innerscan is a primitive plan,
703-
* and therefore has not itself done join_references renumbering
704-
* of the vars in its quals.
678+
* Note we must compare against indxqualorig not the "fixed" indxqual
679+
* (which has index attnos instead of relation attnos, and may have
680+
* been commuted as well).
705681
*/
706682
IndexScan*innerscan= (IndexScan*)inner_plan;
707683
List*indxqualorig=innerscan->indxqualorig;
708684

709-
/* No work needed if indxqual refers only to its own relation... */
710-
if (NumRelids((Node*)indxqualorig)>1)
685+
if (length(indxqualorig)==1)/* single indexscan? */
711686
{
712-
Indexinnerrel=innerscan->scan.scanrelid;
713-
714-
/*
715-
* Remove redundant tests from my clauses, if possible. Note
716-
* we must compare against indxqualorig not the "fixed"
717-
* indxqual (which has index attnos instead of relation
718-
* attnos, and may have been commuted as well).
719-
*/
720-
if (length(indxqualorig)==1)/* single indexscan? */
687+
/* No work needed if indxqual refers only to its own relation... */
688+
if (NumRelids((Node*)indxqualorig)>1)
721689
joinclauses=set_difference(joinclauses,
722690
lfirst(indxqualorig));
723-
724-
/* only refs to outer vars get changed in the inner indexqual */
725-
innerscan->indxqualorig=join_references(indxqualorig,
726-
root->rtable,
727-
outer_tlist,
728-
NIL,
729-
innerrel);
730-
innerscan->indxqual=join_references(innerscan->indxqual,
731-
root->rtable,
732-
outer_tlist,
733-
NIL,
734-
innerrel);
735-
/* fix the inner qpqual too, if it has join clauses */
736-
if (NumRelids((Node*)inner_plan->qual)>1)
737-
inner_plan->qual=join_references(inner_plan->qual,
738-
root->rtable,
739-
outer_tlist,
740-
NIL,
741-
innerrel);
742691
}
743692
}
744-
elseif (IsA(inner_plan,TidScan))
745-
{
746-
TidScan*innerscan= (TidScan*)inner_plan;
747-
748-
innerscan->tideval=join_references(innerscan->tideval,
749-
root->rtable,
750-
outer_tlist,
751-
inner_tlist,
752-
innerscan->scan.scanrelid);
753-
}
754-
755-
/*
756-
* Set quals to contain INNER/OUTER var references.
757-
*/
758-
joinclauses=join_references(joinclauses,
759-
root->rtable,
760-
outer_tlist,
761-
inner_tlist,
762-
(Index)0);
763-
otherclauses=join_references(otherclauses,
764-
root->rtable,
765-
outer_tlist,
766-
inner_tlist,
767-
(Index)0);
768693

769694
join_plan=make_nestloop(tlist,
770695
joinclauses,
@@ -787,8 +712,6 @@ create_mergejoin_plan(Query *root,
787712
Plan*outer_plan,
788713
Plan*inner_plan)
789714
{
790-
List*outer_tlist=outer_plan->targetlist;
791-
List*inner_tlist=inner_plan->targetlist;
792715
List*mergeclauses;
793716
MergeJoin*join_plan;
794717

@@ -806,25 +729,6 @@ create_mergejoin_plan(Query *root,
806729
mergeclauses=get_switched_clauses(best_path->path_mergeclauses,
807730
best_path->jpath.outerjoinpath->parent->relids);
808731

809-
/*
810-
* Fix all the join clauses to contain INNER/OUTER var references.
811-
*/
812-
joinclauses=join_references(joinclauses,
813-
root->rtable,
814-
outer_tlist,
815-
inner_tlist,
816-
(Index)0);
817-
otherclauses=join_references(otherclauses,
818-
root->rtable,
819-
outer_tlist,
820-
inner_tlist,
821-
(Index)0);
822-
mergeclauses=join_references(mergeclauses,
823-
root->rtable,
824-
outer_tlist,
825-
inner_tlist,
826-
(Index)0);
827-
828732
/*
829733
* Create explicit sort nodes for the outer and inner join paths if
830734
* necessary. The sort cost was already accounted for in the path.
@@ -868,8 +772,6 @@ create_hashjoin_plan(Query *root,
868772
Plan*outer_plan,
869773
Plan*inner_plan)
870774
{
871-
List*outer_tlist=outer_plan->targetlist;
872-
List*inner_tlist=inner_plan->targetlist;
873775
List*hashclauses;
874776
HashJoin*join_plan;
875777
Hash*hash_plan;
@@ -890,25 +792,6 @@ create_hashjoin_plan(Query *root,
890792
hashclauses=get_switched_clauses(best_path->path_hashclauses,
891793
best_path->jpath.outerjoinpath->parent->relids);
892794

893-
/*
894-
* Fix all the join clauses to contain INNER/OUTER var references.
895-
*/
896-
joinclauses=join_references(joinclauses,
897-
root->rtable,
898-
outer_tlist,
899-
inner_tlist,
900-
(Index)0);
901-
otherclauses=join_references(otherclauses,
902-
root->rtable,
903-
outer_tlist,
904-
inner_tlist,
905-
(Index)0);
906-
hashclauses=join_references(hashclauses,
907-
root->rtable,
908-
outer_tlist,
909-
inner_tlist,
910-
(Index)0);
911-
912795
/*
913796
* Extract the inner hash keys (right-hand operands of the hashclauses)
914797
* to put in the Hash node.
@@ -922,7 +805,9 @@ create_hashjoin_plan(Query *root,
922805
/*
923806
* Build the hash node and hash join node.
924807
*/
925-
hash_plan=make_hash(inner_tlist,innerhashkeys,inner_plan);
808+
hash_plan=make_hash(inner_plan->targetlist,
809+
innerhashkeys,
810+
inner_plan);
926811
join_plan=make_hashjoin(tlist,
927812
joinclauses,
928813
otherclauses,

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