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https://issues.apache.org/jira/browse/KAFKA-3901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15651775#comment-15651775
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Guozhang Wang commented on KAFKA-3901:
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[~dminkovsky] The motivation of KAFKA-3519 is that, if user's defined
`transform` or `punctuate` function returns {{null}}, it indicates users do not
want to forward any data downstream. In other words, {{null}} is not used as a
special value but as a signal to indicate "no output".
Could you describe your scenario where you would need {{<key, null>}} as a
special record?
> KStreamTransformValues$KStreamTransformValuesProcessor#process() forwards
> null values
> -------------------------------------------------------------------------------------
>
> Key: KAFKA-3901
> URL: https://issues.apache.org/jira/browse/KAFKA-3901
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.0.0
> Reporter: Dmitry Minkovsky
> Assignee: Guozhang Wang
> Priority: Minor
>
> Did this get missed in [KAFKA-3519: Refactor Transformer's transform /
> punctuate to return nullable
> value|https://github.com/apache/kafka/commit/40fd456649b5df29d030da46865b5e7e0ca6db15#diff-338c230fd5a15d98550230007651a224]?
> I think it may have, because that processor's #punctuate() does not forward
> null.
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