@Override
    public String toString() {
      return "Vectors {isSupported=" + isSupported + ", rowCount=" + rowCount
          + ", data=" + Arrays.toString(data) + "}";
    }
Unlike the other overload of processOneSlice, doesn't cache data.
llap-server/src/java/org/apache/hadoop/hive/llap/io/encoded/SerDeEncodedDataReader.java