@Override
    public boolean next(NullWritable nullWritable,
                        OrcStruct orcStruct) throws IOException {
      return inner.next(id, orcStruct);
    }
Return a RecordReader that is compatible with the Hive 0.12 reader
with NullWritable for the key instead of RecordIdentifier.
ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcInputFormat.java