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https://issues.apache.org/jira/browse/KAFKA-13641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17486807#comment-17486807
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Mohammad Yousuf Minhaj Zia commented on KAFKA-13641:
----------------------------------------------------

Going a step further maybe we could also make Tombstone's semantically clear 
using `Either` such that a value in other functions can be `Either<V, 
Tombstone>` where Tombstone is equivalent to null. But that is unrelated to 
this issue so treat it like a fleeting thought.

> 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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