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https://issues.apache.org/jira/browse/PHOENIX-2851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15253094#comment-15253094
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James Taylor commented on PHOENIX-2851:
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FYI, for some other interesting Pig work (that was unfortunately never
committed), see PHOENIX-1561. This seems similar in functionality to our recent
Hive support (PHOENIX-2743).
> Support multi level aggregation through partial aggregation feature in Pig
> --------------------------------------------------------------------------
>
> Key: PHOENIX-2851
> URL: https://issues.apache.org/jira/browse/PHOENIX-2851
> Project: Phoenix
> Issue Type: New Feature
> Reporter: James Taylor
> Assignee: Prashant Kommireddi
>
> Explore the option of pushing partial aggregation in Pig to Phoenix engine.
> Phoenix is good at doing the first level aggregation optimally in
> coprocessors, but lacks the ability to do a multi-level aggregation since
> it's single client node. We could leverage our Pig integration to fill that
> gap.
> Here is the Pig class that does it within the Map phase right now.
> https://pig.apache.org/docs/r0.11.0/api/org/apache/pig/backend/hadoop/executionengine/physicalLayer/relationalOperators/POPartialAgg.html
> This could be built into Pig and might require some patches on Phoenix, or
> might just be a simple delegation.
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