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https://issues.apache.org/jira/browse/KAFKA-7714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16713364#comment-16713364
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Matthias J. Sax commented on KAFKA-7714:
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You can find information about the KIP process in the wiki:
https://cwiki.apache.org/confluence/display/KAFKA/Kafka+Improvement+Proposals
> Scala streams API should use Options in left and outer joins
> ------------------------------------------------------------
>
> Key: KAFKA-7714
> URL: https://issues.apache.org/jira/browse/KAFKA-7714
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 2.0.1, 2.1.0
> Reporter: Charles Crain
> Priority: Minor
> Labels: needs-kip
>
> The Scala streams DSL for left and outer joins should use Options instead of
> possibly-null parameters to the joiner functions. As currently written,
> implementers of joiners for Kafka Streams must account for the right side of
> a left join (or either side of an outer join) being null, which is not
> idiomatic Scala.
> Note to reviewer: I would like to contribute this change myself. What is the
> policy on breaking API changes? Would it be acceptable to change the
> left/outer join APIs to accept options? Or would I need to implement parallel
> versions (naming suggestions if so?).
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