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https://issues.apache.org/jira/browse/KAFKA-16123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17816355#comment-17816355
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Florin Akermann commented on KAFKA-16123:
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I now committed a 'generalized fix'
> KStreamKStreamJoinProcessor forwards null-key records for left/outer joins
> unconditionally of the join window.
> --------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-16123
> URL: https://issues.apache.org/jira/browse/KAFKA-16123
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Florin Akermann
> Assignee: Florin Akermann
> Priority: Major
>
> As part of KIP-962 the non-null key requirements have been relaxed for left
> and outer joins.
> However, the implementation forwards null-key records for left/outer joins
> unconditionally of the join window.
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