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https://issues.apache.org/jira/browse/SPARK-8160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14628324#comment-14628324
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Apache Spark commented on SPARK-8160:
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User 'lianhuiwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/7423
> Tungsten style external aggregation
> -----------------------------------
>
> Key: SPARK-8160
> URL: https://issues.apache.org/jira/browse/SPARK-8160
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Reynold Xin
>
> Support using external sorting to run aggregate so we can easily process
> aggregates where each partition is much larger than memory size.
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