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https://issues.apache.org/jira/browse/KAFKA-17893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17894418#comment-17894418
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Peter Lee commented on KAFKA-17893:
-----------------------------------
[~mjsax]
[https://cwiki.apache.org/confluence/display/KAFKA/KIP-1104%3A+Allow+Foreign+Key+Extraction+from+Both+Key+and+Value+in+KTable+Joins]
Looking forward to hearing your opinion. Thanks!
> Support record keys in the foreignKeyExtractor argument of KTable foreign join
> ------------------------------------------------------------------------------
>
> Key: KAFKA-17893
> URL: https://issues.apache.org/jira/browse/KAFKA-17893
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Piotr Jaszkowski
> Assignee: Peter Lee
> Priority: Minor
> Labels: needs-kip
>
> Only accepting record values in the foreignKeyExtractor is an unnecessary
> limitation that forces weird topologies.
> See discussion in
> https://forum.confluent.io/t/why-foreignkeyextractor-does-not-accept-key/12427/2.
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