enumerate

Add a field with the number of preceding events.

enumerate [out:field, group=any]

Description

The enumerate operator adds a new field with the number of preceding events to the beginning of the input record.

out: field (optional)

Sets the name of the output field.

Defaults to "#".

group: any (optional)

Groups events by the specified expression and enumerates within each group. When provided, an independent enumeration counter is used for each unique value of the grouping expression.

Examples

Enumerate the input by prepending row numbers

from {x: "a"}, {x: "b"}, {x: "c"}
enumerate

{"#": 0, x: "a"}
{"#": 1, x: "b"}
{"#": 2, x: "c"}

Use a custom field for the row numbers

from {x: true}, {x: false}
enumerate index

{index: 0, x: true}
{index: 1, x: false}

Count within groups

from {x: 1}, {x: 2}, {x: 1}, {x: 2}
enumerate count, group=x
count = count + 1

{count: 1, x: 1}
{count: 1, x: 2}
{count: 2, x: 1}
{count: 2, x: 2}