class TableSlice extends Relation {

  @Override
  public List<Column<?>> columns() {
    List<Column<?>> columns = new ArrayList<>();
    for (int i = 0; i < columnCount(); i++) {
      columns.add(column(i));
    }
    return columns;
  }

  public  TableSlice(Table table, Selection rowSelection);
  public  TableSlice(Table table);

}