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Remove geqo_random_seed parameter. Having geqo reset the global random()

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sequence every time it's called is bogus --- it interferes with user
control over the seed, and actually decreases randomness overall
(because a seed based on time(NULL) is pretty predictable).  If you really
want a reproducible result from geqo, do 'set seed = 0' before planning
a query.
This commit is contained in:
Tom Lane
2003-09-07 15:26:54 +00:00
parent 75c35e0f31
commit 48beecda7c
6 changed files with 6 additions and 30 deletions
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4
src/include/optimizer/geqo.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: geqo.h,v 1.31 2003/08/04 02:40:13 momjian Exp $
* $Id: geqo.h,v 1.32 2003/09/07 15:26:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -64,8 +64,6 @@ extern double Geqo_selection_bias;
#define MIN_GEQO_SELECTION_BIAS 1.5
#define MAX_GEQO_SELECTION_BIAS 2.0
extern int Geqo_random_seed; /* or negative to use current time */
/* routines in geqo_main.c */
extern RelOptInfo *geqo(Query *root, int number_of_rels, List *initial_rels);