docs: public static <R, C, V, C2> ImmutableTable<R, C2, V> columnTransformerByCell(
        final Table<R, C, V> table,
        final Function<Table.Cell<R, C, V>, C2> columnTransformer) {
      final ImmutableTable.Builder<R, C2, V> newTable = ImmutableTable.builder();
      for(Table.Cell<R, C, V> cell : table.cellSet()) {
        C2 col = columnTransformer.apply(cell);
        newTable.put(cell.getRowKey(), col, cell.getValue());
      }
      return newTable.build();
    }