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https://issues.apache.org/jira/browse/KAFKA-3511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15235113#comment-15235113
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Michael Noll commented on KAFKA-3511:
-------------------------------------
PS: As [~guozhang] hinted at, we should also keep in mind that preferably we
build an API that is pleasant to use in both Java 7 and Java 8 (notably with
lambdas). Perhaps the work on this ticket means that we should take a step
back and look at the state of the current API again and before we introduce
possible changes because of the additions 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
> 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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