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Add an 'enable_material' GUC.

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The logic for determining whether to materialize has been significantly
overhauled for 9.0.  In case there should be any doubt about whether
materialization is a win in any particular case, this should provide a
convenient way of seeing what happens without it; but even with enable_material
turned off, we still materialize in cases where it is required for
correctness.

Thanks to Tom Lane for the review.
This commit is contained in:
Robert Haas
2010-04-19 00:55:26 +00:00
parent 9287567eff
commit 5b89ef384c
8 changed files with 57 additions and 15 deletions
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10
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.547 2010/04/12 09:52:29 heikki Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.548 2010/04/19 00:55:25 rhaas Exp $
*
*--------------------------------------------------------------------
*/
@ -643,6 +643,14 @@ static struct config_bool ConfigureNamesBool[] =
&enable_hashagg,
true, NULL, NULL
},
{
{"enable_material", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of materialization."),
NULL
},
&enable_material,
true, NULL, NULL
},
{
{"enable_nestloop", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of nested-loop join plans."),