dfr unique for dataframe or lazyframe

Returns unique values from a dataframe.

Signature

> dfr unique

Examples

Returns unique values from a series

> [2 2 2 2 2] | dfr into-df | dfr unique
╭───┬───╮
│ # │ 0 │
├───┼───┤
│ 0 │ 2 │
╰───┴───╯

Creates a is unique expression from a column

> col a | unique