Collects fields from multiple events into one event. It has a limit of 1Kb per key when used as part of a groupBy() operation. This limits the number of values you can index during the aggregation.

fields[a]Array of stringsrequired  Names of the fields to keep.
limitintegeroptional[b]2000 Limit to number of distinct values in collect.
multivalbooleanoptional[b]true Collects the resulting value as multivalue (a single field value using separator).
separatorstringoptional[b]; Separator used for multiple values.

[a] The argument name fields can be omitted.

[b] Optional parameters use their default value unless explicitly set

Omitted Argument Names

The argument name for fields can be omitted; the following forms of this function are equivalent:




These examples show basic structure only; full examples are provided below.

The collect() function is limited in the memory for while collecting data before the data is aggregated. The limit changes depending on whether collect() runs as a top level function — in which case its limit is 10 MiB:

#type = humio #kind=logs
| collect(myField)

or whether it runs in a subquery, or as a sub-aggregator to another function — in which case its limit is 1 MiB:

#type=humio #kind=logs
groupBy(myField, function=collect(myOtherField))

collect() Examples

Collects visitors, each visitor defined as non-active after one minute.

groupby(client_ip, function=session(maxpause=1m, collect([url])))

Collect fields from multiple events, counting the collected field:

LocalAddressIP4 = * RemoteAddressIP4 = * aip = *
| groupBy([LocalAddressIP4, RemoteAddressIP4], function=([count(aip, as=aipCount, distinct=true), collect([aip])]))