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Matthias J. Sax commented on KAFKA-13641: ----------------------------------------- I don't have a good intuition atm what a good way forward would be. However, (to be frank) I don't consider it a too pressing issue. Furthermore, we did accumulate multiple issues in the DSL that are not easy to be fixed, and I personally believe that we will need to do a full "redesign" of the DSL and ship a DSLv2 at some point – this might be the best opportunity to re-consider this question as we won't need to worry about backward compatibility. However, there is no timeline for a DSLv2 right now. > Kafka Streams Scala: Add `Option` to `ValueJoiner` parameters > ------------------------------------------------------------- > > Key: KAFKA-13641 > URL: https://issues.apache.org/jira/browse/KAFKA-13641 > Project: Kafka > Issue Type: Improvement > Components: streams > Reporter: Mohammad Yousuf Minhaj Zia > Priority: Minor > > Since `ValueJoiner` right parameter in `leftJoins`, `outerJoins` can be > nullable, I am wondering if can wrap them around Scala `Option`. > However, there is also the concern that the left hand side value can be null > in the case of tombstone messages, in which the `Option` semantics can be > misleading. I still feel this could be a useful feature in reducing the > number of `NullPointerExceptions`. -- This message was sent by Atlassian Jira (v8.20.1#820001)