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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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7
src/backend/optimizer/plan/createplan.c
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@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.273 2010/02/26 02:00:45 momjian Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.274 2010/03/28 22:59:32 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -164,11 +164,6 @@ create_plan(PlannerInfo *root, Path *best_path)
case T_WorkTableScan:
plan = create_scan_plan(root, best_path);
break;
case T_Join:
/* this is only used for no-op joins */
Assert(IsA(best_path, NoOpPath));
plan = create_plan(root, ((NoOpPath *) best_path)->subpath);
break;
case T_HashJoin:
case T_MergeJoin:
case T_NestLoop: