[jira] [Created] (KAFKA-17893) Support record keys in the foreignKeyExtractor argument of KTable foreign join

[Piotr Jaszkowski (Jira)]

Piotr Jaszkowski created KAFKA-17893:
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             Summary: 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


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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