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Fix cost_mergejoin's failure to adjust for rescanning of non-unique merge join

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keys when considering a semi or anti join.  This requires estimating the
selectivity of the merge qual as though it were a regular inner join condition.
To allow caching both that and the real outer-join-aware selectivity, split
RestrictInfo.this_selec into two fields.

This fixes one of the problems reported by Kevin Grittner.
This commit is contained in:
Tom Lane
2009-02-06 23:43:24 +00:00
parent c87c31f10b
commit c473d92351
9 changed files with 86 additions and 53 deletions
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5
src/backend/nodes/copyfuncs.c
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@@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.422 2009/02/02 19:31:39 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.423 2009/02/06 23:43:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1606,7 +1606,8 @@ _copyRestrictInfo(RestrictInfo *from)
/* EquivalenceClasses are never copied, so shallow-copy the pointers */
COPY_SCALAR_FIELD(parent_ec);
COPY_SCALAR_FIELD(eval_cost);
COPY_SCALAR_FIELD(this_selec);
COPY_SCALAR_FIELD(norm_selec);
COPY_SCALAR_FIELD(outer_selec);
COPY_NODE_FIELD(mergeopfamilies);
/* EquivalenceClasses are never copied, so shallow-copy the pointers */
COPY_SCALAR_FIELD(left_ec);