public void setTimeZone(ZoneId timeZone) {
    if (timestampTZ != null) {
      timestampTZ.setZonedDateTime(
          timestampTZ.getZonedDateTime().withZoneSameInstant(timeZone));
    }
    this.timeZone = timeZone;
  }
true if data is stored in timestamptz field rather than byte arrays.
allows for lazy conversion to bytes when necessary
false otherwise
serde/src/java/org/apache/hadoop/hive/serde2/io/TimestampLocalTZWritable.java