code: protected Row addScoreColumn(Row row, long timestamp, Float score) {
          ColumnFamily cf = row.cf;
          CellName cellName = rowMapper.makeCellName(cf);
          ByteBuffer cellValue = UTF8Type.instance.decompose(score.toString());
  
          ColumnFamily dcf = ArrayBackedSortedColumns.factory.create(baseCfs.metadata);
          dcf.addColumn(cellName, cellValue, timestamp);
          dcf.addAll(row.cf);
  
          return new Row(row.key, dcf);
      }
docs: Adds to the specified {@link Row} the specified Lucene score column.
  
  @param row       A {@link Row}.
  @param timestamp The score column timestamp.
  @param score     The score column value.
  @return The {@link Row} with the score.