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https://issues.apache.org/jira/browse/KAFKA-7654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16702279#comment-16702279
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Guozhang Wang commented on KAFKA-7654:
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For 3), the main caveat is because of Java's type erasure, we cannot always
infer the types after some operations. For example, if you do {{stream.map()}}
which may change both keys and values, we cannot tell if the mapped keys or
values are still JSon or has been transformed to another type: there are some
operators that we are sure no types would be changed and hence we can still use
the serde, but generally speaking we cannot always propagate the serde passed
in from source throughout the topology.
> Relax requirements on serializing-only methods.
> -----------------------------------------------
>
> Key: KAFKA-7654
> URL: https://issues.apache.org/jira/browse/KAFKA-7654
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Bruno Bieth
> Priority: Major
>
> Methods such as KStream#to shouldn't require a Produced as only the
> serializing part is ever used.
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