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https://issues.apache.org/jira/browse/SPARK-2873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14495604#comment-14495604
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Yin Huai commented on SPARK-2873:
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SPARK-2213 will do the sort merge join, which can significantly reduce the
memory footprint of a join operation. I think it is better for this jira to
focus on using a hashmap that be spilled to disk for the aggregate.
> Support disk spilling in Spark SQL aggregation / join
> -----------------------------------------------------
>
> Key: SPARK-2873
> URL: https://issues.apache.org/jira/browse/SPARK-2873
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.0.0
> Reporter: guowei
> Priority: Blocker
>
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