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https://issues.apache.org/jira/browse/DRILL-3840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14908554#comment-14908554
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Julian Hyde edited comment on DRILL-3840 at 9/25/15 7:32 PM:
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Suggest you build on SqlSplittableAggFunction, introduced in CALCITE-751.
And by the way I wouldn't classify this as a "codegen" problem. It needs to be
a logical rewrite. The two phases of aggregation might be done by different
engines, e.g. phoenix and drill.
was (Author: julianhyde):
Suggest you build on SqlSplittableAggFunction, introduced in CALCITE-751.
> Add support for in UDF two-phased aggregate merging for UDAFs
> -------------------------------------------------------------
>
> Key: DRILL-3840
> URL: https://issues.apache.org/jira/browse/DRILL-3840
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Codegen
> Reporter: Jacques Nadeau
>
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