Documentation function is subject to change at any time. introduces an extend mode to the existing group() function.

Function type signature
(<-tables: stream[A], columns: [string], mode: string) => stream[A] where A: Record
For more information, see Function type signatures.



(Required) List of columns to use in the grouping operation. Default is [].


(Required) Grouping mode. extend is the only mode available to

Grouping modes

  • extend: Appends columns defined in the columns parameter to group keys.


Input data. Default is piped-forward data (<-).


Add a column to the group key

import "experimental"

    |> ["region"], mode: "extend")

View example input and ouput

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