public void unparse(SqlWriter writer, SqlCall call, int leftPrec, int rightPrec) {
   final SqlWriter.Frame frame = writer.startFunCall(getName());
   call.operand(0).unparse(writer, leftPrec, rightPrec);
   writer.sep("FROM");
   call.operand(1).unparse(writer, leftPrec, rightPrec);
   writer.endFunCall(frame);
 }