private static int setStreamDataToCache(
      LlapSerDeDataBuffer[][] newCacheDataForCol, CacheWriter.CacheStreamData stream) {
    int streamIx = stream.name.getKind().getNumber();
    // This is kinda hacky - we "know" these are LlaSerDeDataBuffer-s.
    newCacheDataForCol[streamIx] = stream.data.toArray(new LlapSerDeDataBuffer[stream.data.size()]);
    return streamIx;
  }
Unlike the other overload of processOneSlice, doesn't cache data.
llap-server/src/java/org/apache/hadoop/hive/llap/io/encoded/SerDeEncodedDataReader.java