private ResultPair unionTester(Schema ws, GenericData.Record record)
          throws SerDeException, IOException {
      return unionTester(ws, ws, record);
  }
Test whether Avro timestamps can be deserialized according to new behavior (storage in UTC but
LocalDateTime semantics as timestamps are converted back to the writer time zone) as well as
old behavior (Instant semantics).
serde/src/test/org/apache/hadoop/hive/serde2/avro/TestAvroDeserializer.java