@Override
    public void open() throws IOException {
      long startTime = counters.startTimeCounter();
      orcDataReaderRef.open();
      counters.recordHdfsTime(startTime);
    }
A reference to parent DataReader not owned by this object.
llap-server/src/java/org/apache/hadoop/hive/llap/io/encoded/OrcEncodedDataReader.java