Documentation

rename() function

rename() renames columns in a table.

If a column in the 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
For more information, see Function type signatures.

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

Explicitly map column names to new column names

import "sampledata"

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

View example input and output

Rename columns using a function

import "sampledata"

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

View example input and output

Conditionally rename columns using a function

import "sampledata"

sampledata.int()
    |> rename(
        fn: (column) => {
            _newColumnName = if column =~ /^_/ then "${column} (Reserved)" else column

            return _newColumnName
        },
    )

View example input and output


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