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https://issues.apache.org/jira/browse/FLINK-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15393704#comment-15393704
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Gabor Gevay commented on FLINK-2237:
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I think we should have a separate {{setCombineHint}} and {{setReduceHint}}, and
then have a convenience method {{setCombineAndReduceHint}} for setting them
both in one call. If we wanted to have only one method for hints, then we would
have to rename the existing {{setCombineHint}}. Another problem would be
handling {{CombineHint.NONE}}.
> 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
> Assignee: Gabor Gevay
> Priority: Minor
>
> 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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