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https://issues.apache.org/jira/browse/SPARK-4367?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin resolved SPARK-4367.
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Resolution: Fixed
Assignee: Yin Huai
Fix Version/s: 1.5.0
> Partial aggregation support the DISTINCT aggregation
> ----------------------------------------------------
>
> Key: SPARK-4367
> URL: https://issues.apache.org/jira/browse/SPARK-4367
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Cheng Hao
> Assignee: Yin Huai
> Fix For: 1.5.0
>
>
> Most of aggregate function(e.g average) with "distinct" value will requires
> all of the records in the same group to be shuffled into a single node,
> however, as part of the optimization, those records can be partially
> aggregated before shuffling, that probably reduces the overhead of shuffling
> significantly.
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