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 .
  *
  * 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