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https://issues.apache.org/jira/browse/KAFKA-8871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16925939#comment-16925939
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Matthias J. Sax commented on KAFKA-8871:
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Seems to be slightly related to KIP-149 / KIP-159.
> Allow timestamp manipulation in ValueTransformerWithKey
> -------------------------------------------------------
>
> Key: KAFKA-8871
> URL: https://issues.apache.org/jira/browse/KAFKA-8871
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Levani Kokhreidze
> Priority: Minor
> Labels: needs-kip
>
> h3. Motivation
> When using `KStream#transform` in Kafka Streams DSL to manipulate the
> timestamp, `KStreamImpl#transform` implementation marks *repartitionRequired*
> as *true,* which isn't necessarily okay when one may just want to manipulate
> with timestamp without affecting the key. It would be great if DSL user could
> manipulate the timestamp in `ValueTransformerWithKey`.
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