code: protected Float score(Row row) {
          ColumnFamily cf = row.cf;
          CellName cellName = rowMapper.makeCellName(cf);
          Cell cell = cf.getColumn(cellName);
          String value = UTF8Type.instance.compose(cell.value());
          return Float.parseFloat(value);
      }
docs: Returns the score of the specified {@link Row}.
  
  @param row A {@link Row}.
  @return The score of the specified {@link Row}.