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https://issues.apache.org/jira/browse/SPARK-4234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai resolved SPARK-4234.
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Resolution: Fixed
Fix Version/s: 1.5.0
With the interface introduced by SPARK-4233, we have the capability to always
do partial aggregations. I am resolving it.
> 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
> Fix For: 1.5.0
>
>
> 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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