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https://issues.apache.org/jira/browse/SPARK-4234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14199457#comment-14199457
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Cheng Hao commented on SPARK-4234:
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Yes, it looks like that, but we probably need to refactor the current
implementation first. I am working on the POC right now, hopefully we can
discuss that in detail then.
> Always do paritial aggregation
> -------------------------------
>
> Key: SPARK-4234
> URL: https://issues.apache.org/jira/browse/SPARK-4234
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Cheng Hao
>
> Currently, UDAF developer optionally implement a partial aggregation
> function, However this probably cause performance issue by allowing do that.
> We actually can always force developers to provide the partial aggregation
> function as Hive does, hence we will always get the `mapside` aggregation
> optimization.
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