Matthias J. Sax created KAFKA-7492:
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Summary: 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
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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