roll down for filters> roll down {flags} 
--by, -b {int}: Number of rows to roll| input | output | 
|---|---|
| table | table | 
Rolls rows down of a table
> [[ab]; [12] [34] [56]] |roll down
╭───┬───┬───╮
│# │ a │ b │
├───┼───┼───┤
│0│5│6│
│1│1│2│
│2│3│4│
╰───┴───┴───╯
Tips: Command roll down was not included in the official binaries by default, you have to build it with --features=extra flag
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    https://www.nushell.sh/commands/docs/roll_down.html