@Test
 public void toChar() throws Exception {
   List<Expression> args =
       Lists.newArrayList(getInvertedLiteral(date(12, 11, 2001), PDataType.DATE));
   evaluateAndAssertResult(
       new ToCharFunction(
           args, FunctionArgumentType.TEMPORAL, "", DateUtil.getDateFormatter("MM/dd/yy hh:mm a")),
       "12/11/01 12:00 AM");
 }