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https://issues.apache.org/jira/browse/KAFKA-3839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15330865#comment-15330865
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Jeyhun Karimov commented on KAFKA-3839:
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I can take this task as a starter.

> Handling null keys in KTable.groupBy
> ------------------------------------
>
>                 Key: KAFKA-3839
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3839
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Guozhang Wang
>              Labels: architecture, newbie
>
> This is first reported by [~jeff.klu...@gmail.com].
> Similarly as we handle null keys in KStream join and aggregations in 
> KAFKA-3561 (https://github.com/apache/kafka/pull/1472), for KTable.groupBy 
> operators we should also gracefully handle null keys by filter them out since 
> they will not be participating in the aggregation.



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