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https://issues.apache.org/jira/browse/KAFKA-7492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bill Bejeck resolved KAFKA-7492.
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Resolution: Fixed
Thanks asutosh for the contribution!
> Explain `null` handling for reduce and aggregate
> ------------------------------------------------
>
> Key: KAFKA-7492
> URL: https://issues.apache.org/jira/browse/KAFKA-7492
> Project: Kafka
> Issue Type: Improvement
> Components: documentation, streams
> Affects Versions: 2.3.0
> Reporter: Matthias J. Sax
> Priority: Minor
> Labels: beginner, docs, newbie
>
> We currently don't explain how records with `null` value are handled in
> reduce and aggregate. In particular, what happens when the users'
> aggregation/reduce `apply()` implementation returns `null`.
> We should update the JavaDocs accordingly and maybe also update the docs on
> the web page.
> Cf.
> https://stackoverflow.com/questions/52692202/what-happens-if-the-aggregator-of-a-kgroupedstream-returns-null
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