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Second thoughts dept: arrange to cache mergejoin scan selectivity

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in RestrictInfo nodes, instead of recomputing on every use.
This commit is contained in:
Tom Lane
2002-03-01 06:01:20 +00:00
parent f8c109528c
commit 8f0a9e85b3
6 changed files with 34 additions and 13 deletions
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6
src/include/nodes/relation.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: relation.h,v 1.61 2001/11/05 17:46:34 momjian Exp $
* $Id: relation.h,v 1.62 2002/03/01 06:01:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -521,6 +521,10 @@ typedef struct RestrictInfo
List *left_pathkey; /* canonical pathkey for left side */
List *right_pathkey; /* canonical pathkey for right side */
/* cache space for mergeclause processing; -1 if not yet set */
Selectivity left_mergescansel; /* fraction of left side to scan */
Selectivity right_mergescansel; /* fraction of right side to scan */
/* valid if clause is hashjoinable, else InvalidOid: */
Oid hashjoinoperator; /* copy of clause operator */