Fix pull_var_clause call for 9.5 and 9.6

Author: ildus

src/relation_info.c

@@ -187,9 +187,7 @@ refresh_pathman_relation_info(Oid relid,
 	/* Extract Vars and varattnos of partitioning expression */
 	prel->expr_vars = NIL;
 	prel->expr_atts = NULL;
-	prel->expr_vars = pull_var_clause_compat(prel->expr,
-											 PVC_REJECT_AGGREGATES,
-											 PVC_REJECT_PLACEHOLDERS);
+	prel->expr_vars = pull_var_clause_compat(prel->expr, 0, 0);
 	pull_varattnos((Node *) prel->expr_vars, PART_EXPR_VARNO, &prel->expr_atts);
 
 	MemoryContextSwitchTo(old_mcxt);