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https://issues.apache.org/jira/browse/KAFKA-3511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15237291#comment-15237291
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Michael Noll commented on KAFKA-3511:
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[~guozhang]: Could we leverage the parent class
[java.lang.Number|https://docs.oracle.com/javase/7/docs/api/java/lang/Number.html]
somehow?
> Provide built-in aggregators sum() and avg() in Kafka Streams DSL
> -----------------------------------------------------------------
>
> Key: KAFKA-3511
> URL: https://issues.apache.org/jira/browse/KAFKA-3511
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Guozhang Wang
> Labels: api, newbie
> Fix For: 0.10.0.0
>
>
> Currently we only have one built-in aggregate function count() in the Kafka
> Streams DSL, but we want to add more aggregation functions like sum() and
> avg().
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