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https://issues.apache.org/jira/browse/KAFKA-3511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15291455#comment-15291455
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Guozhang Wang commented on KAFKA-3511:
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I think I agree. As long as we still need the {{Mapper}} for projecting on the
"field" we cannot just call stream.sumByKey() or stream.aggregateByKey(SUM)
without any other parameters. Will update the title and description of this
ticket.
> 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
> Assignee: Ishita Mandhan
> Labels: api
> Fix For: 0.10.1.0
>
>
> 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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