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Simple constraint exclusion. For now, only child tables of inheritance

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scans are candidates for exclusion; this should be fixed eventually.
Simon Riggs, with some help from Tom Lane.
This commit is contained in:
Tom Lane
2005-07-23 21:05:48 +00:00
parent 9af9d674c6
commit d007a95055
14 changed files with 621 additions and 105 deletions
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12
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 1.276 2005/07/21 18:06:12 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.277 2005/07/23 21:05:47 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -435,6 +435,16 @@ static struct config_bool ConfigureNamesBool[] =
&enable_hashjoin,
true, NULL, NULL
},
{
{"enable_constraint_exclusion", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Enables the planner's use of constraints in queries."),
gettext_noop("Constraints will be examined to exclude tables "
"that can be proven not to be required to produce "
"a correct result for the query.")
},
&enable_constraint_exclusion,
false, NULL, NULL
},
{
{"geqo", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("Enables genetic query optimization."),