You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2015/07/22 08:27:05 UTC

[jira] [Resolved] (SPARK-4367) Partial aggregation support the DISTINCT aggregation

     [ 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. 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org