Index: contrib/tablefunc/tablefunc.c
===================================================================
RCS file: /opt/src/cvs/pgsql-server/contrib/tablefunc/tablefunc.c,v
retrieving revision 1.16
diff -c -r1.16 tablefunc.c
*** contrib/tablefunc/tablefunc.c	14 May 2003 03:27:22 -0000	1.16
--- contrib/tablefunc/tablefunc.c	16 May 2003 04:48:35 -0000
***************
*** 1048,1053 ****
--- 1048,1058 ----
  	MemoryContext per_query_ctx;
  	MemoryContext oldcontext;
  
+ 	/* check to see if caller supports us returning a tuplestore */
+ 	if (!rsinfo || !(rsinfo->allowedModes & SFRM_Materialize))
+ 		elog(ERROR, "connectby: materialize mode required, but it is not "
+ 			 "allowed in this context");
+ 
  	if (fcinfo->nargs == 6)
  	{
  		branch_delim = GET_STR(PG_GETARG_TEXT_P(5));