diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c
index da258968b8..6cf020acef 100644
--- a/src/backend/optimizer/util/clauses.c
+++ b/src/backend/optimizer/util/clauses.c
@@ -4279,15 +4279,19 @@ recheck_cast_function_args(List *args, Oid result_type,
 	Oid			actual_arg_types[FUNC_MAX_ARGS];
 	Oid			declared_arg_types[FUNC_MAX_ARGS];
 	Oid			rettype;
-	ListCell   *lc;
+//	ListCell   *lc;
 
 	if (list_length(args) > FUNC_MAX_ARGS)
 		elog(ERROR, "too many function arguments");
-	nargs = 0;
-	foreach(lc, args)
-	{
-		actual_arg_types[nargs++] = exprType((Node *) lfirst(lc));
-	}
+//	nargs = 0;
+//	foreach(lc, args)
+//	{
+//		actual_arg_types[nargs++] = exprType((Node *) lfirst(lc));
+//	}
+	nargs = list_length(args);
+	for (int i = 0; i < nargs; i++)
+	    actual_arg_types[i] = exprType((Node *) list_nth(args, i));
+    
 	Assert(nargs == pronargs);
 	memcpy(declared_arg_types, proargtypes, pronargs * sizeof(Oid));
 	rettype = enforce_generic_type_consistency(actual_arg_types,