enable_constraint_exclusion => constraint_exclusion

Also improve wording.

src/backend/optimizer/path/allpaths.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.135 2005/07/23 21:05:46 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.136 2005/08/22 17:34:58 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -36,7 +36,7 @@
 
 
 /* These parameters are set by GUC */
-bool		enable_constraint_exclusion = false;
+bool		constraint_exclusion = false;
 bool		enable_geqo = false;	/* just in case GUC doesn't set it */
 int			geqo_threshold;
 
@@ -318,7 +318,7 @@ set_inherited_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
 		 * exclusion, just ignore it.  (We have to have converted the
 		 * baserestrictinfo Vars before we can make the test.)
 		 */
-		if (enable_constraint_exclusion)
+		if (constraint_exclusion)
 		{
 			List   *constraint_pred;
 

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 1.285 2005/08/21 03:39:34 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.286 2005/08/22 17:34:59 momjian Exp $
  *
  *--------------------------------------------------------------------
  */
@@ -453,13 +453,12 @@ static struct config_bool ConfigureNamesBool[] =
 		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.")
+		{"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 necessary.")
 		},
-		&enable_constraint_exclusion,
+		&constraint_exclusion,
 		false, NULL, NULL
 	},
 	{

src/backend/utils/misc/postgresql.conf.sample

@@ -190,7 +190,7 @@
 # - Other Planner Options -
 
 #default_statistics_target = 10		# range 1-1000
-#enable_constraint_exclusion = off
+#constraint_exclusion = off
 #from_collapse_limit = 8
 #join_collapse_limit = 8		# 1 disables collapsing of explicit 
 					# JOINs

src/include/optimizer/cost.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.69 2005/07/23 21:05:48 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.70 2005/08/22 17:35:03 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -49,7 +49,7 @@ extern bool enable_hashagg;
 extern bool enable_nestloop;
 extern bool enable_mergejoin;
 extern bool enable_hashjoin;
-extern bool enable_constraint_exclusion;
+extern bool constraint_exclusion;
 
 extern double clamp_row_est(double nrows);
 extern void cost_seqscan(Path *path, PlannerInfo *root, RelOptInfo *baserel);

src/test/regress/expected/rangefuncs.out

@@ -1,8 +1,7 @@
 SELECT name, setting FROM pg_settings WHERE name LIKE 'enable%';
             name             | setting 
------------------------------+---------
+-------------------+---------
  enable_bitmapscan           | on
- enable_constraint_exclusion | off
  enable_hashagg              | on
  enable_hashjoin             | on
  enable_indexscan            | on
@@ -11,7 +10,7 @@ SELECT name, setting FROM pg_settings WHERE name LIKE 'enable%';
  enable_seqscan              | on
  enable_sort                 | on
  enable_tidscan              | on
-(10 rows)
+(9 rows)
 
 CREATE TABLE foo2(fooid int, f2 int);
 INSERT INTO foo2 VALUES(1, 11);