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https://issues.apache.org/jira/browse/KAFKA-9500?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Roesler resolved KAFKA-9500.
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Resolution: Fixed
> Foreign-Key Join creates an invalid topology
> --------------------------------------------
>
> Key: KAFKA-9500
> URL: https://issues.apache.org/jira/browse/KAFKA-9500
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.4.0
> Reporter: John Roesler
> Assignee: John Roesler
> Priority: Blocker
> Fix For: 2.5.0, 2.4.1
>
>
> Foreign-Key Join results are not required to be materialized by default, but
> they might be needed if downstream operators need to perform lookups on the
> result (such as when the join result participates in an equi-join).
> Currently, if the result is explicitly materialized (via Materialized), this
> works correctly, but if the result is _not_ materialized explicitly, but _is_
> needed, the topology builder throws an exception that the result store isn't
> added to the topology. This was an oversight in testing and review and needs
> to be fixed ASAP.
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