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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 [[email protected]].
> 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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