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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 commented on DRILL-3840:
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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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