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https://issues.apache.org/jira/browse/KAFKA-7492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775386#comment-16775386
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ASF GitHub Bot commented on KAFKA-7492:
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bbejeck commented on pull request #6285: KAFKA-7492 : Updated javadocs for
aggregate and reduce methods returning null behavior.
URL: https://github.com/apache/kafka/pull/6285
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> 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
> 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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