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Teach planner how to rearrange join order for some classes of OUTER JOIN.

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Per my recent proposal.  I ended up basing the implementation on the
existing mechanism for enforcing valid join orders of IN joins --- the
rules for valid outer-join orders are somewhat similar.
This commit is contained in:
Tom Lane
2005-12-20 02:30:36 +00:00
parent 1a6aaaa6c4
commit e3b9852728
23 changed files with 969 additions and 722 deletions
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4
src/backend/optimizer/util/relnode.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/relnode.c,v 1.73 2005/11/22 18:17:15 momjian Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/relnode.c,v 1.74 2005/12/20 02:30:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -133,7 +133,6 @@ make_reloptinfo(PlannerInfo *root, int relid, RelOptKind reloptkind)
rel->baserestrictinfo = NIL;
rel->baserestrictcost.startup = 0;
rel->baserestrictcost.per_tuple = 0;
rel->outerjoinset = NULL;
rel->joininfo = NIL;
rel->index_outer_relids = NULL;
rel->index_inner_paths = NIL;
@ -369,7 +368,6 @@ build_join_rel(PlannerInfo *root,
joinrel->baserestrictinfo = NIL;
joinrel->baserestrictcost.startup = 0;
joinrel->baserestrictcost.per_tuple = 0;
joinrel->outerjoinset = NULL;
joinrel->joininfo = NIL;
joinrel->index_outer_relids = NULL;
joinrel->index_inner_paths = NIL;