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https://issues.apache.org/jira/browse/KAFKA-12213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17280044#comment-17280044
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Matthias J. Sax commented on KAFKA-12213:
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Works for me. Just wanted to point out, that [~bbejeck] also started to look
into this (just learned about it), breaking it down into similar PRs.
You should sync with him to avoid duplicate work. From my understanding, he
started to prepare a PR for the `ValueJoiner` interface.
> Kafka Streams aggregation Initializer to accept record key
> ----------------------------------------------------------
>
> Key: KAFKA-12213
> URL: https://issues.apache.org/jira/browse/KAFKA-12213
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Reporter: Piotr Fras
> Assignee: Piotr Fras
> Priority: Minor
> Labels: needs-kip
>
> Sometimes Kafka record key contains useful information for creating a zero
> object in aggregation Initializer. This feature is to add kafka record key to
> Initializer.
> There were two approaches I considered to implement this feature, one
> respecting backwards compatibility for internal and external APIs and the
> other one which is not. I chose the latter one as it was more strait-forward.
> We may want to validate this approach tho.
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