Index: src/backend/commands/tablecmds.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v
retrieving revision 1.259
diff -c -c -r1.259 tablecmds.c
*** src/backend/commands/tablecmds.c	19 Jun 2008 00:46:04 -0000	1.259
--- src/backend/commands/tablecmds.c	16 Jul 2008 16:35:28 -0000
***************
*** 762,767 ****
--- 762,770 ----
  	ResultRelInfo *resultRelInfo;
  	ListCell   *cell;
  
+ 	/* make list unique */
+ 	stmt->relations = list_union(NIL, stmt->relations);
+ 
  	/*
  	 * Open, exclusive-lock, and check all the explicitly-specified relations
  	 */