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https://issues.apache.org/jira/browse/SPARK-8579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14636495#comment-14636495
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Apache Spark commented on SPARK-8579:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/7591
> Support arbitrary object in UnsafeRow
> -------------------------------------
>
> Key: SPARK-8579
> URL: https://issues.apache.org/jira/browse/SPARK-8579
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
> Fix For: 1.5.0
>
>
> It's common to run count(distinct xxx) in SQL, the data type will be UDT of
> OpenHashSet, it's good that we could use UnsafeRow to reducing the memory
> usage during aggregation.
> Also for DecimalType, which could be used inside the grouping key.
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