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From "Reynold Xin (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-4367) Partial aggregation support the DISTINCT aggregation
Date Wed, 22 Jul 2015 06:27:05 GMT

     [ https://issues.apache.org/jira/browse/SPARK-4367?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Reynold Xin resolved SPARK-4367.
--------------------------------
       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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