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Stephan Ewen commented on FLINK-2237:
-------------------------------------
I think it would be fine to have one hint for both. If hash is good for the
combiner, it should be acceptable for the reducer too.
We may want to allow optimizer to override that hint for the reducer, in cases
where sort order can be reused.
> 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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