private String udfDisplayWithInputs(GenericUDF udf) {
    return udf.getDisplayString(new String[] { value, pattern }) + " sessionZone=" + zone + ", formatter=" + formatter
        + ", resolver Style=" + resolverStyle;
  }
Tests for {@link GenericUDFToUnixTimeStamp#evaluate(DeferredObject[])} with string value and pattern inputs.
ql/src/test/org/apache/hadoop/hive/ql/udf/generic/TestGenericUDFToUnixTimestampEvaluateStringString.java