dfr is-null for dataframe

Signature

> dfr is-null {flags}

Input/output types:

Examples

Create mask where values are null

>lets= ([5608] |dfr into-df);
letres= ($s/$s);
$res|dfr is-null
╭───┬─────────╮
│# │ is_null │
├───┼─────────┤
│0│false│
│1│false│
│2│true│
│3│false│
╰───┴─────────╯

Creates a is null expression from a column

>dfr cola|dfr is-null

Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag