@Override
    public Map<R, V2> column(@ParametricNullness C columnKey) {
      return Maps.transformValues(fromTable.column(columnKey), function);
    }

    Function<Cell<R, C, V1>, Cell<R, C, V2>> cellFunction() {
      return new Function<Cell<R, C, V1>, Cell<R, C, V2>>() {
        @Override
        public Cell<R, C, V2> apply(Cell<R, C, V1> cell) {
          return immutableCell(