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https://issues.apache.org/jira/browse/SPARK-1627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14008276#comment-14008276
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Reynold Xin commented on SPARK-1627:
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A related pull request: https://github.com/apache/spark/pull/867
> Spark SQL should better support external sorting
> ------------------------------------------------
>
> Key: SPARK-1627
> URL: https://issues.apache.org/jira/browse/SPARK-1627
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.0.0, 0.9.1
> Reporter: Chen Chao
>
> Spark SQL Aggregator does not support external sorting now which is extremely
> important when data is much larger than memory.
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