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https://issues.apache.org/jira/browse/KAFKA-4001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15592846#comment-15592846
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ASF GitHub Bot commented on KAFKA-4001:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/1777
> Improve Kafka Streams Join Semantics (KIP-77)
> ---------------------------------------------
>
> Key: KAFKA-4001
> URL: https://issues.apache.org/jira/browse/KAFKA-4001
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Matthias J. Sax
> Assignee: Matthias J. Sax
> Fix For: 0.10.2.0
>
>
> Kafka Streams supports three types of joins:
> * KStream-KStream
> * KStream-KTable
> * KTable-KTable
> Furthermore, Kafka Streams supports the join variant, namely
> * inner join
> * left join
> * outer join
> Not all combination of "type" and "variant" are supported.
> *The problem is, that the semantics of the different joins do use different
> semantics (and are thus inconsistent).*
> With this ticket, we want to
> * introduce unique semantics over all joins
> * improve handling of "null"
> * add missing inner KStream-KTable join
> See KIP-76 for more details:
> https://cwiki.apache.org/confluence/display/KAFKA/KIP-76%3A+Improve+Kafka+Streams+Join+Semantics
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