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Allow the planner's estimate of the fraction of a cursor's rows that will be

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retrieved to be controlled through a GUC variable.

Robert Hell
This commit is contained in:
Tom Lane
2008-05-02 21:26:10 +00:00
parent cf9f6c8d8e
commit db147b3483
5 changed files with 58 additions and 8 deletions
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6
src/include/optimizer/planmain.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.107 2008/04/17 21:22:14 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.108 2008/05/02 21:26:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -17,6 +17,10 @@
#include "nodes/plannodes.h"
#include "nodes/relation.h"
/* GUC parameters */
#define DEFAULT_CURSOR_TUPLE_FRACTION 0.1
extern double cursor_tuple_fraction;
/*
* prototypes for plan/planmain.c
*/