[jira] [Commented] (KAFKA-3337) Extract selector as a separate groupBy operator for KTable aggregations

["Guozhang Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-3337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15194046#comment-15194046 ] 

Guozhang Wang commented on KAFKA-3337:
--------------------------------------

[~gwenshap] Down grading to major as it may not be included in 0.10.0.0.

> Extract selector as a separate groupBy operator for KTable aggregations
> -----------------------------------------------------------------------
>
>                 Key: KAFKA-3337
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3337
>             Project: Kafka
>          Issue Type: Sub-task
>            Reporter: Guozhang Wang
>             Fix For: 0.10.0.0
>
>
> Currently KTable aggregation takes a selector and an aggregator, which makes the function a little bit "heavy". It is better to extract the selector in a separate groupBy function such that
> {code}
> table.groupBy(selector).aggregate(aggregator);
> {code}



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