dfr append for dataframe

Appends a new dataframe.

Signature

> dfr append

Examples

Appends a dataframe as new columns

> let a = ([[a b]; [1 2] [3 4]] | dfr into-df);
    $a | dfr append $a
╭───┬───┬───┬─────┬─────╮
│ # │ a │ b │ a_x │ b_x │
├───┼───┼───┼─────┼─────┤
│ 0 │ 1 │ 2 │   1 │   2 │
│ 1 │ 3 │ 4 │   3 │   4 │
╰───┴───┴───┴─────┴─────╯

Appends a dataframe merging at the end of columns

> let a = ([[a b]; [1 2] [3 4]] | dfr into-df);
    $a | dfr append $a --col
╭───┬───┬───╮
│ # │ a │ b │
├───┼───┼───┤
│ 0 │ 1 │ 2 │
│ 1 │ 3 │ 4 │
│ 2 │ 1 │ 2 │
│ 3 │ 3 │ 4 │
╰───┴───┴───╯