@Override
    Iterator<Cell<R, C, V2>> cellIterator() {
      return Iterators.transform(fromTable.cellSet().iterator(), cellFunction());
    }

    @Override
    Spliterator<Cell<R, C, V2>> cellSpliterator() {
      return CollectSpliterators.map(fromTable.cellSet().spliterator(), cellFunction());
    }

    @Override
    public Set<R> rowKeySet() {
      return fromTable.rowKeySet();
    }

    @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(