Repair planning bugs caused by my misguided removal of restrictinfo link

fields in JoinPaths --- turns out that we do need that after all :-(.
Also, rearrange planner so that only one RelOptInfo is created for a
particular set of joined base relations, no matter how many different
subsets of relations it can be created from.  This saves memory and
processing time compared to the old method of making a bunch of RelOptInfos
and then removing the duplicates.  Clean up the jointree iteration logic;
not sure if it's better, but I sure find it more readable and plausible
now, particularly for the case of 'bushy plans'.

1 files changed, 15 insertions, 48 deletions

diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 9dccbf50170..38db7def0b1 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.81 2000/01/27 18:11:28 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.82 2000/02/07 04:40:57 tgl Exp $
  *
  * NOTES
  *	  Most of the read functions for plan nodes are tested. (In fact, they
@@ -1288,8 +1288,8 @@ _readRelOptInfo()
 	sscanf(token, "%x", (unsigned int *) &local_node->cheapestpath);
 
 
-	token = lsptok(NULL, &length);		/* get :restrictinfo */
-	local_node->restrictinfo = nodeRead(true);	/* now read it */
+	token = lsptok(NULL, &length);		/* get :baserestrictinfo */
+	local_node->baserestrictinfo = nodeRead(true);	/* now read it */
 
 	token = lsptok(NULL, &length);		/* get :joininfo */
 	local_node->joininfo = nodeRead(true);		/* now read it */
@@ -1518,25 +1518,14 @@ _readNestPath()
 	token = lsptok(NULL, &length);		/* get :pathkeys */
 	local_node->path.pathkeys = nodeRead(true); /* now read it */
 
-	/*
-	 * Not sure if these are nodes; they're declared as "struct path *".
-	 * For now, i'll just print the addresses.
-	 *
-	 * GJK:  Since I am parsing this stuff, I'll just ignore the addresses,
-	 * and initialize these pointers to NULL.
-	 */
-
 	token = lsptok(NULL, &length);		/* get :outerjoinpath */
-	token = lsptok(NULL, &length);		/* get @ */
-	token = lsptok(NULL, &length);		/* now read it */
-
-	local_node->outerjoinpath = NULL;
+	local_node->outerjoinpath = nodeRead(true); /* now read it */
 
 	token = lsptok(NULL, &length);		/* get :innerjoinpath */
-	token = lsptok(NULL, &length);		/* get @ */
-	token = lsptok(NULL, &length);		/* now read it */
+	local_node->innerjoinpath = nodeRead(true); /* now read it */
 
-	local_node->innerjoinpath = NULL;
+	token = lsptok(NULL, &length);		/* get :joinrestrictinfo */
+	local_node->joinrestrictinfo = nodeRead(true); /* now read it */
 
 	return local_node;
 }
@@ -1569,25 +1558,14 @@ _readMergePath()
 	token = lsptok(NULL, &length);		/* get :pathkeys */
 	local_node->jpath.path.pathkeys = nodeRead(true);	/* now read it */
 
-	/*
-	 * Not sure if these are nodes; they're declared as "struct path *".
-	 * For now, i'll just print the addresses.
-	 *
-	 * GJK:  Since I am parsing this stuff, I'll just ignore the addresses,
-	 * and initialize these pointers to NULL.
-	 */
-
 	token = lsptok(NULL, &length);		/* get :outerjoinpath */
-	token = lsptok(NULL, &length);		/* get @ */
-	token = lsptok(NULL, &length);		/* now read it */
-
-	local_node->jpath.outerjoinpath = NULL;
+	local_node->jpath.outerjoinpath = nodeRead(true); /* now read it */
 
 	token = lsptok(NULL, &length);		/* get :innerjoinpath */
-	token = lsptok(NULL, &length);		/* get @ */
-	token = lsptok(NULL, &length);		/* now read it */
+	local_node->jpath.innerjoinpath = nodeRead(true); /* now read it */
 
-	local_node->jpath.innerjoinpath = NULL;
+	token = lsptok(NULL, &length);		/* get :joinrestrictinfo */
+	local_node->jpath.joinrestrictinfo = nodeRead(true); /* now read it */
 
 	token = lsptok(NULL, &length);		/* get :path_mergeclauses */
 	local_node->path_mergeclauses = nodeRead(true);		/* now read it */
@@ -1629,25 +1607,14 @@ _readHashPath()
 	token = lsptok(NULL, &length);		/* get :pathkeys */
 	local_node->jpath.path.pathkeys = nodeRead(true);	/* now read it */
 
-	/*
-	 * Not sure if these are nodes; they're declared as "struct path *".
-	 * For now, i'll just print the addresses.
-	 *
-	 * GJK:  Since I am parsing this stuff, I'll just ignore the addresses,
-	 * and initialize these pointers to NULL.
-	 */
-
 	token = lsptok(NULL, &length);		/* get :outerjoinpath */
-	token = lsptok(NULL, &length);		/* get @ */
-	token = lsptok(NULL, &length);		/* now read it */
-
-	local_node->jpath.outerjoinpath = NULL;
+	local_node->jpath.outerjoinpath = nodeRead(true); /* now read it */
 
 	token = lsptok(NULL, &length);		/* get :innerjoinpath */
-	token = lsptok(NULL, &length);		/* get @ */
-	token = lsptok(NULL, &length);		/* now read it */
+	local_node->jpath.innerjoinpath = nodeRead(true); /* now read it */
 
-	local_node->jpath.innerjoinpath = NULL;
+	token = lsptok(NULL, &length);		/* get :joinrestrictinfo */
+	local_node->jpath.joinrestrictinfo = nodeRead(true); /* now read it */
 
 	token = lsptok(NULL, &length);		/* get :path_hashclauses */
 	local_node->path_hashclauses = nodeRead(true);		/* now read it */