public List<Cell> listCells() {
    return isEmpty() ? null : Arrays.asList(rawCells());
  }
Create a sorted list of the Cell's in this result. Since HBase 0.20.5 this is equivalent to
raw().
@return sorted List of Cells; can be null if no cells in the result
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Result.java