@Override
    public long[] putFileData(Object fileKey, DiskRange[] ranges,
        MemoryBuffer[] data, long baseOffset) {
      return putFileData(fileKey, ranges, data, baseOffset, null);
    }
A reference to parent DataReader not owned by this object.
llap-server/src/java/org/apache/hadoop/hive/llap/io/encoded/OrcEncodedDataReader.java