Improve description of constraint_exclusion variable.

diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index eb087e67fe7b6e49180bf92ae8c069acf09dbe40..79e162efc023666c8c2cdd90887e5b533a5e0b12 100644 (file)
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -10,7 +10,7 @@
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.298 2005/11/04 22:18:26 petere Exp $
+ *       $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.299 2005/11/04 23:50:30 tgl Exp $
  *
  *--------------------------------------------------------------------
  */
@@ -464,9 +464,9 @@ static struct config_bool ConfigureNamesBool[] =
        },
        {
                {"constraint_exclusion", PGC_USERSET, QUERY_TUNING_OTHER,
-                       gettext_noop("Enables the planner to use constraints to limit table access."),
-                       gettext_noop("This prevents table access if the table constraints "
-                                                "guarantee that table access is not necessary.")
+                       gettext_noop("Enables the planner to use constraints to optimize queries."),
+                       gettext_noop("Child table scans will be skipped if their "
+                                                "constraints guarantee that no rows match the query.")
                },
                &constraint_exclusion,
                false, NULL, NULL