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https://issues.apache.org/jira/browse/KAFKA-18196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17913091#comment-17913091
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Matthias J. Sax commented on KAFKA-18196:
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What are we doing about this now?
> Reuse window store for stream-stream self-join
> ----------------------------------------------
>
> Key: KAFKA-18196
> URL: https://issues.apache.org/jira/browse/KAFKA-18196
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: A. Sophie Blee-Goldman
> Assignee: Kuan Po Tseng
> Priority: Major
>
> We can optimize the stream-stream self-join by using only a single copy of
> the state store. Right now this operator gets compiled down into two separate
> window stores for each side, even though both sides are identical.
> See https://github.com/apache/kafka/pull/18111#discussion_r1876844961
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