Optimizer rename.

doc/src/sgml/ref/set.sgml

@@ -406,7 +406,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
 	  </para>
 	  <para>
 		This algorithm is on by default, which used GEQO for
-		statements of six or more tables and indexes.
+		statements of six or more tables.
 		(See the chapter on GEQO in the Programmer's Guide
 		for more information).
 	  </para>
@@ -677,7 +677,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
 	  SET DATESTYLE TO 'ISO';
 	</programlisting>
 	<programlisting> 
-	  --Enable GEQO for queries with 4 or more tables and indexes
+	  --Enable GEQO for queries with 4 or more tables
 	  --
 	  SET GEQO ON=4;
 	</programlisting>

src/backend/optimizer/geqo/geqo_eval.c

@@ -5,7 +5,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: geqo_eval.c,v 1.29 1999/02/13 23:16:07 momjian Exp $
+ * $Id: geqo_eval.c,v 1.30 1999/02/14 04:56:45 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -135,7 +135,7 @@ gimme_tree(Query *root, Gene *tour, int rel_count, int num_gene, RelOptInfo *out
 			}
 
 			/* process new_rel->pathlist */
-			find_all_join_paths(root, new_rels);
+			update_rels_pathlist_for_joins(root, new_rels);
 
 			/* prune new_rels */
 			/* MAU: is this necessary? */

src/backend/optimizer/path/allpaths.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.31 1999/02/13 23:16:14 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.32 1999/02/14 04:56:46 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -43,7 +43,7 @@ bool		_use_geqo_ = false;
 int32		_use_geqo_rels_ = GEQO_RELS;
 
 
-static void find_rel_paths(Query *root, List *rels);
+static void find_base_rel_paths(Query *root, List *rels);
 static List *find_join_paths(Query *root, List *outer_rels, int levels_needed);
 
 #ifdef OPTIMIZER_DEBUG
@@ -71,10 +71,7 @@ find_paths(Query *root, List *rels)
 	if (levels_needed <= 0)
 		return NIL;
 
-	/*
-	 * Find the base relation paths.
-	 */
-	find_rel_paths(root, rels);
+	find_base_rel_paths(root, rels);
 
 	if (levels_needed <= 1)
 	{
@@ -96,7 +93,7 @@ find_paths(Query *root, List *rels)
 }
 
 /*
- * find_rel_paths
+ * find_base_rel_paths
  *	  Finds all paths available for scanning each relation entry in
  *	  'rels'.  Sequential scan and any available indices are considered
  *	  if possible(indices are not considered for lower nesting levels).
@@ -105,7 +102,7 @@ find_paths(Query *root, List *rels)
  *	  MODIFIES: rels
  */
 static void
-find_rel_paths(Query *root, List *rels)
+find_base_rel_paths(Query *root, List *rels)
 {
 	List	   *temp;
 
@@ -154,7 +151,7 @@ find_rel_paths(Query *root, List *rels)
  *	  finding ways to join relations(both original and derived) together.
  *
  * 'outer_rels' is the current list of relations for which join paths
- *				are to be found, i.e., he current list of relations that
+ *				are to be found, i.e., the current list of relations that
  *				have already been derived.
  * 'levels_needed' is the number of iterations needed
  *
@@ -172,20 +169,8 @@ find_join_paths(Query *root, List *outer_rels, int levels_needed)
 	 * genetic query optimizer entry point	   *
 	 *	  <utesch@aut.tu-freiberg.de>		   *
 	 *******************************************/
-	{
-		List	   *temp;
-		int			paths_to_consider = 0;
-
-		foreach(temp, outer_rels)
-		{
-			RelOptInfo *rel = (RelOptInfo *) lfirst(temp);
-			paths_to_consider += length(rel->pathlist);
-		}
-
-		if ((_use_geqo_) && paths_to_consider >= _use_geqo_rels_)
-			/* returns _one_ RelOptInfo, so lcons it */
-			return lcons(geqo(root), NIL);	
-	}
+	if ((_use_geqo_) && length(root->base_relation_list_) >= _use_geqo_rels_)
+		return lcons(geqo(root), NIL);  /* returns *one* Rel, so lcons it */
 	
 	/*******************************************
 	 * rest will be deprecated in case of GEQO *
@@ -199,11 +184,11 @@ find_join_paths(Query *root, List *outer_rels, int levels_needed)
 		 * modify 'new_rels' accordingly, then eliminate redundant join
 		 * relations.
 		 */
-		new_rels = find_join_rels(root, outer_rels);
+		new_rels = make_new_rels_by_joins(root, outer_rels);
 
-		find_all_join_paths(root, new_rels);
+		update_rels_pathlist_for_joins(root, new_rels);
 
-		prune_joinrels(new_rels);
+		merge_rels_with_same_relids(new_rels);
 
 #if 0
 		/*
@@ -232,11 +217,11 @@ find_join_paths(Query *root, List *outer_rels, int levels_needed)
 		foreach(x, new_rels)
 		{
 			rel = (RelOptInfo *) lfirst(x);
+
 			if (rel->size <= 0)
 				rel->size = compute_rel_size(rel);
 			rel->width = compute_rel_width(rel);
 
-			/* #define OPTIMIZER_DEBUG */
 #ifdef OPTIMIZER_DEBUG
 			printf("levels left: %d\n", levels_needed);
 			debug_print_rel(root, rel);
@@ -259,6 +244,7 @@ find_join_paths(Query *root, List *outer_rels, int levels_needed)
 		}
 		else
 			root->join_rel_list = new_rels;
+
 		if (!BushyPlanFlag)
 			outer_rels = new_rels;
 	}

src/backend/optimizer/path/joinpath.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinpath.c,v 1.23 1999/02/13 23:16:18 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinpath.c,v 1.24 1999/02/14 04:56:46 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -42,7 +42,7 @@ static List *hash_inner_and_outer(RelOptInfo *joinrel, RelOptInfo *outerrel, Rel
 					 List *hashinfo_list);
 
 /*
- * find_all_join_paths
+ * update_rels_pathlist_for_joins
  *	  Creates all possible ways to process joins for each of the join
  *	  relations in the list 'joinrels.'  Each unique path will be included
  *	  in the join relation's 'pathlist' field.
@@ -62,16 +62,17 @@ static List *hash_inner_and_outer(RelOptInfo *joinrel, RelOptInfo *outerrel, Rel
  * It does a destructive modification.
  */
 void
-find_all_join_paths(Query *root, List *joinrels)
+update_rels_pathlist_for_joins(Query *root, List *joinrels)
 {
 	List	   *mergeinfo_list = NIL;
 	List	   *hashinfo_list = NIL;
 	List	   *temp_list = NIL;
 	List	   *path = NIL;
+	List	   *j;
 
-	while (joinrels != NIL)
+	foreach(j, joinrels)
 	{
-		RelOptInfo *joinrel = (RelOptInfo *) lfirst(joinrels);
+		RelOptInfo *joinrel = (RelOptInfo *) lfirst(j);
 		List	   *innerrelids;
 		List	   *outerrelids;
 		RelOptInfo *innerrel;
@@ -174,8 +175,6 @@ find_all_join_paths(Query *root, List *joinrels)
 			 * since the base level
 			 */
 		}
-
-		joinrels = lnext(joinrels);
 	}
 }
 

src/backend/optimizer/path/joinrels.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinrels.c,v 1.20 1999/02/13 23:16:18 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinrels.c,v 1.21 1999/02/14 04:56:47 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -44,7 +44,7 @@ static void set_joinrel_size(RelOptInfo *joinrel, RelOptInfo *outer_rel, RelOptI
 				 JoinInfo * jinfo);
 
 /*
- * find_join_rels
+ * make_new_rels_by_joins
  *	  Find all possible joins for each of the outer join relations in
  *	  'outer_rels'.  A rel node is created for each possible join relation,
  *	  and the resulting list of nodes is returned.	If at all possible, only
@@ -57,7 +57,7 @@ static void set_joinrel_size(RelOptInfo *joinrel, RelOptInfo *outer_rel, RelOptI
  * Returns a list of rel nodes corresponding to the new join relations.
  */
 List *
-find_join_rels(Query *root, List *outer_rels)
+make_new_rels_by_joins(Query *root, List *outer_rels)
 {
 	List	   *joins = NIL;
 	List	   *join_list = NIL;
@@ -69,6 +69,10 @@ find_join_rels(Query *root, List *outer_rels)
 
 		if (!(joins = find_clause_joins(root, outer_rel, outer_rel->joininfo)))
 		{
+			/*
+			 * Oops, we have a relation that is not joined to any other
+			 * relation.  Cartesian product time.
+			 */
 			if (BushyPlanFlag)
 				joins = find_clauseless_joins(outer_rel, outer_rels);
 			else
@@ -124,7 +128,8 @@ find_clause_joins(Query *root, RelOptInfo *outer_rel, List *joininfo_list)
 					{
 						if (rel != NULL)
 							join_list = lappend(join_list, rel);
-						rel = init_join_rel(get_base_rel(root, lfirsti(other_rels)),
+						rel = init_join_rel(get_base_rel(root,
+														 lfirsti(other_rels)),
 											outer_rel,
 											joininfo);
 					}

src/backend/optimizer/path/prune.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/optimizer/path/Attic/prune.c,v 1.31 1999/02/13 23:16:23 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/optimizer/path/Attic/prune.c,v 1.32 1999/02/14 04:56:47 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -24,10 +24,10 @@
 #include "utils/elog.h"
 
 
-static List *prune_joinrel(RelOptInfo *rel, List *other_rels);
+static List *merge_rel_with_same_relids(RelOptInfo *rel, List *other_rels);
 
 /*
- * prune_joinrels
+ * merge_rels_with_same_relids
  *	  Removes any redundant relation entries from a list of rel nodes
  *	  'rel_list'.  Obviously, the first relation can't be a duplicate.
  *
@@ -35,7 +35,7 @@ static List *prune_joinrel(RelOptInfo *rel, List *other_rels);
  *
  */
 void
-prune_joinrels(List *rel_list)
+merge_rels_with_same_relids(List *rel_list)
 {
 	List	   *i;
 
@@ -44,11 +44,11 @@ prune_joinrels(List *rel_list)
 	 * deleted
 	 */
 	foreach(i, rel_list)
-		lnext(i) = prune_joinrel((RelOptInfo *) lfirst(i), lnext(i));
+		lnext(i) = merge_rel_with_same_relids((RelOptInfo *) lfirst(i), lnext(i));
 }
 
 /*
- * prune_joinrel
+ * merge_rel_with_same_relids
  *	  Prunes those relations from 'other_rels' that are redundant with
  *	  'rel'.  A relation is redundant if it is built up of the same
  *	  relations as 'rel'.  Paths for the redundant relation are merged into
@@ -59,7 +59,7 @@ prune_joinrels(List *rel_list)
  *
  */
 static List *
-prune_joinrel(RelOptInfo *rel, List *other_rels)
+merge_rel_with_same_relids(RelOptInfo *rel, List *other_rels)
 {
 	List	   *i = NIL;
 	List	   *result = NIL;
@@ -126,7 +126,7 @@ merge_joinrels(List *rel_list1, List *rel_list2)
 	{
 		RelOptInfo *rel = (RelOptInfo *) lfirst(xrel);
 
-		rel_list2 = prune_joinrel(rel, rel_list2);
+		rel_list2 = merge_rel_with_same_relids(rel, rel_list2);
 	}
 	return append(rel_list1, rel_list2);
 }

src/backend/optimizer/plan/initsplan.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/optimizer/plan/initsplan.c,v 1.23 1999/02/13 23:16:29 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/optimizer/plan/initsplan.c,v 1.24 1999/02/14 04:56:50 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -303,16 +303,16 @@ add_vars_to_targetlist(Query *root, List *vars, List *join_relids)
  *****************************************************************************/
 
 /*
- * init_join_info
+ * set_joininfo_mergeable_hashable
  *	  Set the MergeJoinable or HashJoinable field for every joininfo node
- *	  (within a rel node) and the MergeJoinOrder or HashJoinOp field for
+ *	  (within a rel node) and the mergejoinorder or hashjoinop field for
  *	  each restrictinfo node(within a joininfo node) for all relations in a
  *	  query.
  *
  *	  Returns nothing.
  */
 void
-init_join_info(List *rel_list)
+set_joininfo_mergeable_hashable(List *rel_list)
 {
 	List	   *x,
 			   *y,

src/backend/optimizer/plan/planmain.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planmain.c,v 1.31 1999/02/13 23:16:30 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planmain.c,v 1.32 1999/02/14 04:56:50 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -257,12 +257,7 @@ subplanner(Query *root,
 	add_restrict_and_join_to_rels(root, qual);
 	add_missing_vars_to_tlist(root, flat_tlist);
 
-	/*
-	 * Find all possible scan and join paths. Mark all the clauses and
-	 * relations that can be processed using special join methods, then do
-	 * the exhaustive path search.
-	 */
-	init_join_info(root->base_rel_list);
+	set_joininfo_mergeable_hashable(root->base_rel_list);
 
 	final_rel_list = find_paths(root, root->base_rel_list);
 

src/include/optimizer/paths.h

@@ -7,7 +7,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: paths.h,v 1.15 1999/02/13 23:21:50 momjian Exp $
+ * $Id: paths.h,v 1.16 1999/02/14 04:56:55 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -35,7 +35,7 @@ extern List *find_index_paths(Query *root, RelOptInfo *rel, List *indices,
  * joinpath.h
  *	   routines to create join paths
  */
-extern void find_all_join_paths(Query *root, List *joinrels);
+extern void update_rels_pathlist_for_joins(Query *root, List *joinrels);
 
 
 /*
@@ -77,14 +77,14 @@ extern MergeInfo *match_order_mergeinfo(PathOrder *ordering,
  * joinrels.h
  *	  routines to determine which relations to join
  */
-extern List *find_join_rels(Query *root, List *outer_rels);
+extern List *make_new_rels_by_joins(Query *root, List *outer_rels);
 extern void add_new_joininfos(Query *root, List *joinrels, List *outerrels);
 extern List *final_join_rels(List *join_rel_list);
 
 /*
  * prototypes for path/prune.c
  */
-extern void prune_joinrels(List *rel_list);
+extern void merge_rels_with_same_relids(List *rel_list);
 extern void rels_set_cheapest(List *rel_list);
 extern List *merge_joinrels(List *rel_list1, List *rel_list2);
 extern List *prune_oldrels(List *old_rels);

src/include/optimizer/planmain.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: planmain.h,v 1.21 1999/02/13 23:21:50 momjian Exp $
+ * $Id: planmain.h,v 1.22 1999/02/14 04:56:58 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -43,7 +43,7 @@ extern Unique *make_unique(List *tlist, Plan *lefttree, char *uniqueAttr);
  */
 extern void make_var_only_tlist(Query *root, List *tlist);
 extern void add_restrict_and_join_to_rels(Query *root, List *clauses);
-extern void init_join_info(List *rel_list);
+extern void set_joininfo_mergeable_hashable(List *rel_list);
 extern void add_missing_vars_to_tlist(Query *root, List *tlist);
 
 /*

src/include/version.h.in

 /*------------------------------------------------------------------------- 
  *
- * version.h.in--
+ * version.h.in
  *	  this file contains the interface to version.c.
  *	  Also some parameters.
  *
- * $Header: /cvsroot/pgsql/src/include/Attic/version.h.in,v 1.4 1998/12/25 02:20:11 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/include/Attic/version.h.in,v 1.5 1999/02/14 04:56:54 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */

src/man/set.l

 .\" This is -*-nroff-*-
 .\" XXX standard disclaimer belongs here....
-.\" $Header: /cvsroot/pgsql/src/man/Attic/set.l,v 1.13 1999/02/02 20:30:18 momjian Exp $
+.\" $Header: /cvsroot/pgsql/src/man/Attic/set.l,v 1.14 1999/02/14 04:57:02 momjian Exp $
 .TH SET SQL 05/14/97 PostgreSQL PostgreSQL
 .SH NAME
 set - set run-time parameters for session
@@ -44,7 +44,7 @@ determines the output format for the date and time data types.
 .IR GEQO
 enables or disables the genetic optimizer algorithm. This algorithm is
 .IR on
-by default, which used GEQO for statements of six or more tables and indexes.
+by default, which used GEQO for statements of six or more tables.
 Set the
 .IR Programmer's Guide
 for more information.
@@ -101,7 +101,7 @@ set DateStyle to 'SQL,European'
 .PP
 .nf
 --
---Use GEQO for statements with 4 or more tables and indexes
+--Use GEQO for statements with 4 or more tables
 --
 set GEQO to 'on=4'
 --