dfr fill-null for lazyframe

Replaces NULL values with the given expression.

Signature

> dfr fill-null

Examples

Fills the null values by 0

> [1 2 2 3 3] | dfr into-df | dfr shift 2 | dfr fill-null 0
╭───┬───╮
│ # │ 0 │
├───┼───┤
│ 0 │ 0 │
│ 1 │ 0 │
│ 2 │ 1 │
│ 3 │ 2 │
│ 4 │ 2 │
╰───┴───╯