rename() function

rename() renames columns in a table.

If a column in group key is renamed, the column name in the group key is updated.

Function type signature

(<-tables: stream[B], ?columns: A, ?fn: (column: string) => string) => stream[C] where A: Record, B: Record, C: Record

Parameters

columns

Record that maps old column names to new column names.

fn

Function that takes the current column name (column) and returns a new column name.

tables

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

Examples

• Map column names to new column names
• Rename columns using a function

Map column names to new column names

import "sampledata"

sampledata.int()
    |> rename(columns: {tag: "uid", _value: "val"})

Rename columns using a function

import "sampledata"

sampledata.int()
    |> rename(fn: (column) => "${column}_new")