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https://issues.apache.org/jira/browse/SPARK-6451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-6451.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.4.0

Issue resolved by pull request 5138
[https://github.com/apache/spark/pull/5138]

> Support CombineSum in Code Gen
> ------------------------------
>
>                 Key: SPARK-6451
>                 URL: https://issues.apache.org/jira/browse/SPARK-6451
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Yin Huai
>            Assignee: Venkata Ramana G
>            Priority: Blocker
>             Fix For: 1.4.0
>
>
> Since we are using CombineSum at the reducer side for the SUM function, we 
> need to make it work in code gen. Otherwise, code gen will not convert 
> Aggregates with a SUM function to GeneratedAggregates (the code gen version).



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