dfr select for lazyframe

Selects columns from lazyframe.

Signature

> dfr select

Examples

Select a column from the dataframe

> [[a b]; [6 2] [4 2] [2 2]] | dfr into-df | dfr select a
╭───┬───╮
│ # │ a │
├───┼───┤
│ 0 │ 6 │
│ 1 │ 4 │
│ 2 │ 2 │
╰───┴───╯