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https://issues.apache.org/jira/browse/SPARK-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14266124#comment-14266124
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Cheng Hao commented on SPARK-4366:
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[~marmbrus] I've uploaded an draft design doc for the UDAF interface, let me
know if you have any concerns or confusing.
> Aggregation Optimization
> ------------------------
>
> Key: SPARK-4366
> URL: https://issues.apache.org/jira/browse/SPARK-4366
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Cheng Hao
> Attachments: aggregatefunction_v1.pdf
>
>
> This improvement actually includes couple of sub tasks.
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