dfr count-null for dataframe

Signature

> dfr count-null {flags}

Input/output types:

Examples

Counts null values

>lets= ([1100334] |dfr into-df);
    ($s/$s) |dfr count-null
╭───┬────────────╮
│# │ count_null │
├───┼────────────┤
│0│2│
╰───┴────────────╯

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