@Override
    public OrcIndex readRowIndex(StripeInformation stripe,
                                 TypeDescription fileSchema,
                                 OrcProto.StripeFooter footer,
                                 boolean ignoreNonUtf8BloomFilter,
                                 boolean[] included,
                                 OrcProto.RowIndex[] indexes,
                                 boolean[] sargColumns,
                                 org.apache.orc.OrcFile.WriterVersion version,
                                 OrcProto.Stream.Kind[] bloomFilterKinds,
                                 OrcProto.BloomFilterIndex[] bloomFilterIndices
                                 ) throws IOException {
      return orcDataReaderRef.readRowIndex(stripe, fileSchema, footer,
          ignoreNonUtf8BloomFilter, included, indexes,
          sargColumns, version, bloomFilterKinds, bloomFilterIndices);
    }
A reference to parent DataReader not owned by this object.
llap-server/src/java/org/apache/hadoop/hive/llap/io/encoded/OrcEncodedDataReader.java