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https://issues.apache.org/jira/browse/KAFKA-14400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Victor van den Hoven resolved KAFKA-14400.
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Resolution: Not A Bug
It behaves differently because stream-stram-leftjoin semantics have changed.
> KStream - KStream - LeftJoin() does not call ValueJoiner with null value
> -------------------------------------------------------------------------
>
> Key: KAFKA-14400
> URL: https://issues.apache.org/jira/browse/KAFKA-14400
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 3.1.1, 3.3.1
> Environment: Windows PC
> Reporter: Victor van den Hoven
> Priority: Major
> Attachments: Afbeelding 2.png, SimpleStreamTopology.java,
> SimpleStreamTopologyTest.java
>
>
> In Kafka-streams 3.1.1 :
> When using +JoinWindows.ofTimeDifferenceWithNoGrace(Duration.ofMillis(10000))+
> the KStream {*}leftJoin{*}(KStream otherStream, ValueJoiner {_}joiner{_},
> JoinWindows windows) does not seem to call the _joiner_ with null value when
> join predicate is not satisfied (not expected).
>
> When using deprecated +JoinWindows.of(Duration.ofMillis(10000));+
> the KStream {*}leftJoin{*}(KStream otherStream, ValueJoiner {_}joiner{_},
> JoinWindows windows) does
> call the _joiner_ with null value when join predicate is not satisfied (as
> expected and documented).
>
> Attached you can find two files with TopologyTestDriver Unit test to
> reproduce.
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