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https://issues.apache.org/jira/browse/SPARK-9240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14648621#comment-14648621
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Apache Spark commented on SPARK-9240:
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User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/7813
> Hybrid aggregate operator using unsafe row
> ------------------------------------------
>
> Key: SPARK-9240
> URL: https://issues.apache.org/jira/browse/SPARK-9240
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Yin Huai
> Priority: Blocker
>
> We need a hybrid aggregate operator, which first tries hash-based
> aggregations and gracefully switch to sort-based aggregations if the hash
> map's memory footprint exceeds a given threshold (how to track memory
> footprint and how to set the threshold?).
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