dfr columns for dataframe

Show dataframe columns.

Signature

> dfr columns {flags}

Input/output types:

input	output
any	any

Examples

Dataframe columns

> [[a b]; [1 2] [3 4]] | dfr into-df | dfr columns
╭───┬───╮
│ 0 │ a │
│ 1 │ b │
╰───┴───╯

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