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Add the ability to extract OR indexscan conditions from OR-of-AND

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join conditions in which each OR subclause includes a constraint on
the same relation.  This implements the other useful side-effect of
conversion to CNF format, without its unpleasant side-effects.  As
per pghackers discussion of a few weeks ago.
This commit is contained in:
Tom Lane
2004-01-05 05:07:36 +00:00
parent bf488a6842
commit 9091e8d1b2
16 changed files with 438 additions and 295 deletions
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3
src/backend/optimizer/plan/createplan.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.161 2003/11/29 19:51:50 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.162 2004/01/05 05:07:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -643,6 +643,7 @@ create_unique_plan(Query *root, UniquePath *best_path)
plan = (Plan *) make_unique(my_tlist, plan, sortList);
}
/* Adjust output size estimate (other fields should be OK already) */
plan->plan_rows = best_path->rows;
return plan;