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https://issues.apache.org/jira/browse/KAFKA-7497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robin Moffatt updated KAFKA-7497:
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Issue Type: New Feature (was: Bug)
> Kafka Streams should support self-join on streams
> -------------------------------------------------
>
> Key: KAFKA-7497
> URL: https://issues.apache.org/jira/browse/KAFKA-7497
> Project: Kafka
> Issue Type: New Feature
> Reporter: Robin Moffatt
> Priority: Major
>
> ref [https://github.com/confluentinc/ksql/issues/2030]
>
> There are valid reasons to want to join a stream to itself, but Kafka Streams
> does not currently support this ({{Invalid topology: Topic foo has already
> been registered by another source.}}). To perform the join requires creating
> a second stream as a clone of the first, and then doing a join between the
> two. This is a clunky workaround and results in unnecessary duplication of
> data.
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