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Posted to issues@spark.apache.org by "Yin Huai (JIRA)" <ji...@apache.org> on 2015/07/22 22:25:04 UTC

[jira] [Resolved] (SPARK-4234) Always do paritial aggregation

     [ https://issues.apache.org/jira/browse/SPARK-4234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yin Huai resolved SPARK-4234.
-----------------------------
       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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