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https://issues.apache.org/jira/browse/SPARK-6451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14376088#comment-14376088
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Apache Spark commented on SPARK-6451:
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User 'gvramana' has created a pull request for this issue:
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
> Priority: Blocker
>
> 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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