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https://issues.apache.org/jira/browse/KAFKA-6936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16488381#comment-16488381
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Guozhang Wang commented on KAFKA-6936:
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Is this PR going to resolve your issue?
https://github.com/apache/kafka/pull/5066
> Scala API Wrapper for Streams uses default serializer for table aggregate
> -------------------------------------------------------------------------
>
> Key: KAFKA-6936
> URL: https://issues.apache.org/jira/browse/KAFKA-6936
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.0.0
> Reporter: Daniel Heinrich
> Priority: Major
>
> On of the goals of the Scala API is to not fall back on the configured
> default serializer, but let the compiler provide them through implicits.
> The aggregate method on KGroupedStream misses to achieve this goal.
> Compared to the Java API is this behavior very supprising, because no other
> stream operation falls back to the default serializer and a developer assums,
> that the compiler checks for the correct serializer type.
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