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https://issues.apache.org/jira/browse/KAFKA-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16151627#comment-16151627
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Dmitry Minkovsky commented on KAFKA-2984:
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Will this sort of thing ever be exposed externally?
> KTable should send old values along with new values to downstreams
> ------------------------------------------------------------------
>
> Key: KAFKA-2984
> URL: https://issues.apache.org/jira/browse/KAFKA-2984
> Project: Kafka
> Issue Type: Sub-task
> Components: streams
> Affects Versions: 0.10.0.0
> Reporter: Yasuhiro Matsuda
> Assignee: Yasuhiro Matsuda
> Fix For: 0.10.0.0
>
>
> Old values are necessary for implementing aggregate functions. KTable should
> augment an event with its old value. Basically KTable stream is a stream of
> (key, (new value, old value)) internally. The old value may be omitted when
> it is not used in the topology.
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