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https://issues.apache.org/jira/browse/KAFKA-7654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16702887#comment-16702887
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Bruno Bieth commented on KAFKA-7654:
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I might sound redundant but this isn't a limitation of Java's type-system, it
is a design issue. You could very well overload map so that one is strict about
the mapper's return type, and another one takes a Serde as an extra parameter.
Think about how this would look like with reified generics: at best you could
report a compilation error when the types aren't aligned, but to make this work
you'll eventually need the extra Serde so you'll be back with an overloaded map
function.
> 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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