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https://issues.apache.org/jira/browse/SPARK-6424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15941589#comment-15941589
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Takeshi Yamamuro commented on SPARK-6424:
-----------------------------------------
We already have fixed the Aggregation improvements in SPARK-4366, so I'll close
this.
> Support user-defined aggregators in AggregateFunction
> -----------------------------------------------------
>
> Key: SPARK-6424
> URL: https://issues.apache.org/jira/browse/SPARK-6424
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Takeshi Yamamuro
>
> Add a new interface to implement user-defined aggregators in
> AggregateExpression.
> This enables third-parties to easily implement various operations on
> DataFrame.
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