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https://issues.apache.org/jira/browse/FLINK-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14592256#comment-14592256
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Stephan Ewen commented on FLINK-2237:
-------------------------------------
All of that being said, be aware of what you are implementing here: This may be
one of the tougtest open issues in Flink. Since the performance of the hash
aggregator pretty much defies the performance of the job, we really need to
make every CPU cycle count in that implementation.
> Add hash-based Aggregation
> --------------------------
>
> Key: FLINK-2237
> URL: https://issues.apache.org/jira/browse/FLINK-2237
> Project: Flink
> Issue Type: New Feature
> Reporter: Rafiullah Momand
> Priority: Minor
> Labels: github-import
> Fix For: pre-apache
>
>
> Aggregation functions at the moment are implemented in a sort-based way.
> How can we implement hash based Aggregation for Flink?
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