Reimplement nodeMaterial to use a temporary BufFile (or even memory, if the

materialized tupleset is small enough) instead of a temporary relation.
This was something I was thinking of doing anyway for performance, and Jan
says he needs it for TOAST because he doesn't want to cope with toasting
noname relations.  With this change, the 'noname table' support in heap.c
is dead code, and I have accordingly removed it.  Also clean up 'noname'
plan handling in planner --- nonames are either sort or materialize plans,
and it seems less confusing to handle them separately under those names.

src/include/utils/rel.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: rel.h,v 1.37 2000/06/17 21:49:02 tgl Exp $
+ * $Id: rel.h,v 1.38 2000/06/18 22:44:34 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -90,7 +90,6 @@ typedef struct RelationData
 	uint16		rd_refcnt;		/* reference count */
 	bool		rd_myxactonly;	/* rel uses the local buffer mgr */
 	bool		rd_isnailed;	/* rel is nailed in cache */
-	bool		rd_isnoname;	/* rel has no name */
 	bool		rd_unlinked;	/* rel already unlinked or not created yet */
 	bool		rd_indexfound;	/* true if rd_indexlist is valid */
 	Form_pg_am	rd_am;			/* AM tuple */