*** pgsql/src/backend/executor/nodeAppend.c	2008-08-18 16:20:40.000000000 +0900
--- pgsql.patched/src/backend/executor/nodeAppend.c	2008-08-23 07:37:29.000000000 +0900
***************
*** 143,152 ****
--- 143,156 ----
  	int			nplans;
  	int			i;
  	Plan	   *initNode;
+ 	TupleDesc  save_tupledesc;
  
  	/* check for unsupported flags */
  	Assert(!(eflags & EXEC_FLAG_MARK));
  
+ 	/* Save tuple desc */
+ 	save_tupledesc = estate->es_rscan_tupledesc;
+ 
  	/*
  	 * Set up empty vector of subplan states
  	 */
***************
*** 232,237 ****
--- 236,243 ----
  	appendstate->as_whichplan = appendstate->as_firstplan;
  	exec_append_initialize_next(appendstate);
  
+ 	/* Restore tuple desc */
+ 	estate->es_rscan_tupledesc = save_tupledesc;
+ 
  	return appendstate;
  }