duplicate() function

duplicate() duplicates a specified column in a table.

If the specified column is part of the group key, it will be duplicated, but the duplicate column will not be part of the output’s group key.

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



(Required) Column to duplicate.


(Required) Name to assign to the duplicate column.

If the as column already exists, it will be overwritten by the duplicated column.


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


Duplicate a column

import "sampledata"
    |> duplicate(column: "tag", as: "tag_dup")

View example input and ouput

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