Matthias J. Sax created KAFKA-7492: -------------------------------------- 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 -- This message was sent by Atlassian JIRA (v7.6.3#76005)