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

[Guozhang Wang (JIRA)]

Guozhang Wang created KAFKA-3337:
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             Summary: 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
            Priority: Blocker
             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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