Get rid of some old and crufty global variables in the planner. When

this code was last gone over, there wasn't really any alternative to
globals because we didn't have the PlannerInfo struct being passed all
through the planner code.  Now that we do, we can restructure things
to avoid non-reentrancy.  I'm fooling with this because otherwise I'd
have had to add another global variable for the planned compact
range table list.

src/include/nodes/nodes.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/nodes/nodes.h,v 1.194 2007/02/03 14:06:55 petere Exp $
+ * $PostgreSQL: pgsql/src/include/nodes/nodes.h,v 1.195 2007/02/19 07:03:31 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -175,6 +175,7 @@ typedef enum NodeTag
 	 * TAGS FOR PLANNER NODES (relation.h)
 	 */
 	T_PlannerInfo = 500,
+	T_PlannerGlobal,
 	T_RelOptInfo,
 	T_IndexOptInfo,
 	T_Path,
@@ -198,6 +199,7 @@ typedef enum NodeTag
 	T_OuterJoinInfo,
 	T_InClauseInfo,
 	T_AppendRelInfo,
+	T_PlannerParamItem,
 
 	/*
 	 * TAGS FOR MEMORY NODES (memnodes.h)