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https://issues.apache.org/jira/browse/KAFKA-3511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15290440#comment-15290440
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Jay Kreps commented on KAFKA-3511:
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It just seems really weird to bake one or two aggregates into the framework
when there will be many of them and others will not be invoked the same way. As
a user I wonder why are these aggregates invoked differently then others?
But further, how common is it that you actually ever want to do a sum() or
count() on its own outside of example code. Wouldn't your sum or count
virtually always be one field in a richer record?
> 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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