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https://issues.apache.org/jira/browse/KAFKA-3745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15583079#comment-15583079
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Andrew Musselman commented on KAFKA-3745:
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Still keeping this open?

> Consider adding join key to ValueJoiner interface
> -------------------------------------------------
>
>                 Key: KAFKA-3745
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3745
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>    Affects Versions: 0.10.0.0
>            Reporter: Greg Fodor
>            Priority: Minor
>              Labels: api, newbie
>
> In working with Kafka Stream joining, it's sometimes the case that a join key 
> is not actually present in the values of the joins themselves (if, for 
> example, a previous transform generated an ephemeral join key.) In such 
> cases, the actual key of the join is not available in the ValueJoiner 
> implementation to be used to construct the final joined value. This can be 
> worked around by explicitly threading the join key into the value if needed, 
> but it seems like extending the interface to pass the join key along as well 
> would be helpful.



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