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https://issues.apache.org/jira/browse/KAFKA-13641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17487431#comment-17487431
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Kvicii.Yu commented on KAFKA-13641:
-----------------------------------
[~yzia2000]
I don't think it's a good idea to modify the method signature. If you really
need to modify it, I would recommend creating a new V2 version or other classes
to replace the existing logic.
> 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`.
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