Splunk® Data Stream Processor

Function Reference

On April 3, 2023, Splunk Data Stream Processor reached its end of sale, and will reach its end of life on February 28, 2025. If you are an existing DSP customer, please reach out to your account team for more information.

All DSP releases prior to DSP 1.4.0 use Gravity, a Kubernetes orchestrator, which has been announced end-of-life. We have replaced Gravity with an alternative component in DSP 1.4.0. Therefore, we will no longer provide support for versions of DSP prior to DSP 1.4.0 after July 1, 2023. We advise all of our customers to upgrade to DSP 1.4.0 in order to continue to receive full product support from Splunk.

MV Expand

This topic describes how to use the function in the .


Use the mvexpand function to expand the values in a multivalue field into separate events, one event for each value in the multivalue field.

Function Input/Output

Function Input
This function takes in collections of records with schema R.
Function Output
This function outputs the same collection of records but with a different schema S.



Required arguments

Syntax: <field>
Description: The name of the multivalue field that you want to expand. You can only specify one field to expand.

Optional arguments

Syntax: <int>
Description: Specifies the number of values to expand in the multivalue field array. If there are any remaining values in the array those values are dropped. If omitted limit defaults to 0, which means there is no limit and all values are expanded.
Example in Canvas View: 5


Suppose your streaming data has fields a, b, and c. Each field has the following corresponding values:

Field a Field b Field c
1 x V1, V2, V3
2 y V4, V5

Pass in the c field to the mvexpand function:

Field Description Example
Field This is the name of the multivalue field. c
Limit This is the limit you want to set. 0

This example takes each row from the incoming streaming data and then creates a new row with each value in the c field. The other fields will have duplicate values, while the c field will have each value from the multivalue field in a separate row.

Field a Field b Field c
1 x V1
1 x V2
1 x V3
2 y V4
2 y V5

SPL2 example

Examples of common use cases follow. The following examples in this section assume that you are in the SPL View.

When working in the SPL View you can write the function by providing the arguments in the exact order shown in each use case.

Create a new record for each value of the multivalue field, "foo".

... | mvexpand foo |...

Limit the number of values from the multivalue field to expand

Create new records for the first 5 values of multivalue field, "foo". Any remaining values are dropped.

...| mvexpand limit=5 foo |...
Last modified on 17 March, 2022
Merge Events   Rex

This documentation applies to the following versions of Splunk® Data Stream Processor: 1.1.0, 1.2.0, 1.2.1-patch02, 1.2.1, 1.2.2-patch02, 1.2.4, 1.2.5, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.4.2, 1.4.3, 1.4.4

Was this topic useful?

You must be logged into splunk.com in order to post comments. Log in now.

Please try to keep this discussion focused on the content covered in this documentation topic. If you have a more general question about Splunk functionality or are experiencing a difficulty with Splunk, consider posting a question to Splunkbase Answers.

0 out of 1000 Characters