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Rework join-removal logic as per recent discussion. In particular this

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fixes things so that it works for cases where nested removals are possible.
The overhead of the optimization should be significantly less, as well.
This commit is contained in:
Tom Lane
2010-03-28 22:59:34 +00:00
parent a760893dbd
commit b78f6264eb
17 changed files with 585 additions and 317 deletions
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22
src/backend/optimizer/util/pathnode.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/pathnode.c,v 1.157 2010/02/26 02:00:47 momjian Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/pathnode.c,v 1.158 2010/03/28 22:59:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1214,26 +1214,6 @@ distinct_col_search(int colno, List *colnos, List *opids)
return InvalidOid;
}
/*
* create_noop_path
* Creates a path equivalent to the input subpath, but having a different
* parent rel. This is used when a join is found to be removable.
*/
NoOpPath *
create_noop_path(PlannerInfo *root, RelOptInfo *rel, Path *subpath)
{
NoOpPath *pathnode = makeNode(NoOpPath);
pathnode->path.pathtype = T_Join; /* by convention */
pathnode->path.parent = rel;
pathnode->path.startup_cost = subpath->startup_cost;
pathnode->path.total_cost = subpath->total_cost;
pathnode->path.pathkeys = subpath->pathkeys;
pathnode->subpath = subpath;
return pathnode;
}
/*
* create_subqueryscan_path
* Creates a path corresponding to a sequential scan of a subquery,