@Override
  public Object evaluate(DeferredObject[] arguments) throws HiveException {
    Object o0 = arguments[0].get();
    if (o0 == null) {
      return null;
    }
    return converter.convert(o0);
  }
Convert from string to TIMESTAMP WITH LOCAL TIME ZONE.
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFToTimestampLocalTZ.java