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https://issues.apache.org/jira/browse/KAFKA-4481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ewen Cheslack-Postava updated KAFKA-4481:
-----------------------------------------
Labels: kip usability (was: usability)
> Relax Kafka Streams API type constraints
> ----------------------------------------
>
> Key: KAFKA-4481
> URL: https://issues.apache.org/jira/browse/KAFKA-4481
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Xavier Léauté
> Assignee: Xavier Léauté
> Labels: kip, usability
> Fix For: 0.10.2.0
>
>
> Streams API methods that apply transformations to streams are currently
> invariant in the key and value types, when they should probably be
> contravariant in those types.
> For instance, {{KStream.filter(Predicate<K, V> predicate)}} should be
> {{KStream.filter(Predicate<? super K, ? super V> predicate)}} to accept
> predicates that can act on any supertype of K, or V.
> Same thing applies to method that take {{Aggregator}}, {{StreamPartitioner}},
> {{KeyValueMapper}}, {{ValueMapper}}, {{ProcessorSupplier}}, {{ValueJoiner}},
> etc.
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