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https://issues.apache.org/jira/browse/SPARK-9240?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin resolved SPARK-9240.
--------------------------------
       Resolution: Fixed
         Assignee: Yin Huai
    Fix Version/s: 1.5.0

> 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
>            Assignee: Yin Huai
>            Priority: Blocker
>             Fix For: 1.5.0
>
>
> 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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