@Override
  public ByteBuffer getData() {
    // Callers duplicate the buffer, they have to for BufferChunk; so we don't have to.
    return buffer.getByteBufferRaw();
  }
DiskRange containing encoded, uncompressed data from cache.
It should be hidden inside EncodedReaderImpl, but we need to expose it for tests.
ql/src/java/org/apache/hadoop/hive/ql/io/orc/encoded/CacheChunk.java