@Override
    public ObjectInspector getObjectInspector() {
      return OrcStruct.createObjectInspector(0, OrcUtils.getOrcTypes(readOptions.getSchema()));
    }
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