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Fix oversight in planning for multiple indexscans driven by

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ScalarArrayOpExpr index quals: we were estimating the right total
number of rows returned, but treating the index-access part of the
cost as if a single scan were fetching that many consecutive index
tuples.  Actually we should treat it as a multiple indexscan, and
if there are enough of 'em the Mackert-Lohman discount should kick in.
This commit is contained in:
Tom Lane
2006-07-01 22:07:23 +00:00
parent cffd89ca73
commit 08ccdf020e
3 changed files with 84 additions and 39 deletions
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3
src/include/utils/selfuncs.h
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/selfuncs.h,v 1.33 2006/05/02 11:28:55 teodor Exp $
* $PostgreSQL: pgsql/src/include/utils/selfuncs.h,v 1.34 2006/07/01 22:07:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -151,6 +151,7 @@ extern Selectivity scalararraysel(PlannerInfo *root,
ScalarArrayOpExpr *clause,
bool is_join_clause,
int varRelid, JoinType jointype);
extern int estimate_array_length(Node *arrayexpr);
extern Selectivity rowcomparesel(PlannerInfo *root,
RowCompareExpr *clause,
int varRelid, JoinType jointype);