polars selector all for expression

Creates a selector that selects all columns.

Signature

> polars selector all {flags}

Input/output types:

inputoutput
anypolars_selector

Examples

Create a selector for all columns

> polars selector all

Multiply all columns by 2 using with-column

> [[a b]; [1 2] [3 4]]
                    | polars into-df
                    | polars with-column ((polars selector all) * 2)
                    | polars collect
╭───┬───┬───╮
│ # │ a │ b │
├───┼───┼───┤
│ 0 │ 2 │ 4 │
│ 1 │ 6 │ 8 │
╰───┴───┴───╯