public Cell getColumnLatestCell(byte[] family, byte[] qualifier) {
    Cell[] kvs = rawCells(); // side effect possibly.
    if (kvs == null || kvs.length == 0) {
      return null;
    }
    int pos = binarySearch(kvs, family, qualifier);
    if (pos == -1) {
      return null;
    }
    if (CellUtil.matchingColumn(kvs[pos], family, qualifier)) {
      return kvs[pos];
    }
    return null;
  }
The Cell for the most recent timestamp for a given column.
@return the Cell for the column, or null if no value exists in the row or none have been
        selected in the query (Get/Scan)
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Result.java