docs: public static Cell parseSingleValue(final KeyValue column) {
      if (column.qualifier().length == 2 || (column.qualifier().length == 4 && 
          inMilliseconds(column.qualifier()))) {
        final ArrayList<KeyValue> row = new ArrayList<KeyValue>(1);
        row.add(column);
        final ArrayList<Cell> cells = extractDataPoints(row, 1);
        if (cells.isEmpty()) {
          return null;
        }
        return cells.get(0);
      }
      throw new IllegalDataException (
          "Qualifier does not appear to be a single data point: " + column);
    }