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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/outfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.351 2009/02/02 19:31:39 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.352 2009/02/06 23:43:23 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@ -1609,7 +1609,8 @@ _outRestrictInfo(StringInfo str, RestrictInfo *node)
WRITE_BITMAPSET_FIELD(right_relids);
WRITE_NODE_FIELD(orclause);
/* don't write parent_ec, leads to infinite recursion in plan tree dump */
WRITE_FLOAT_FIELD(this_selec, "%.4f");
WRITE_FLOAT_FIELD(norm_selec, "%.4f");
WRITE_FLOAT_FIELD(outer_selec, "%.4f");
WRITE_NODE_FIELD(mergeopfamilies);
/* don't write left_ec, leads to infinite recursion in plan tree dump */
/* don't write right_ec, leads to infinite recursion in plan tree dump */