rename() function

The rename() function renames specified columns in a table. If a column is renamed and is part of the group key, the column name in the group key will be updated.

There are two variants:

• one which maps old column names to new column names
• one which takes a mapping function.

rename(columns: {host: "server", facility: "datacenter"})

// OR

rename(fn: (column) => "{column}_new")

Parameters

columns

A map of columns to rename and their corresponding new names. Cannot be used with fn.

fn

A function mapping between old and new column names. Cannot be used with columns.

tables

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

Examples

The following examples use data provided by the sampledata package to show how rename() transforms data.

• Rename specific columns
• Rename all columns using a function

Rename specific columns

import "sampledata"

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

Rename all columns using a function

import "sampledata"

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