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https://issues.apache.org/jira/browse/SPARK-3947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14487175#comment-14487175
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Takeshi Yamamuro commented on SPARK-3947:
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See SPARK-4233, we are refactoring the interfaces of Aggregate before it
support UDAF.
https://issues.apache.org/jira/browse/SPARK-4233
> [Spark SQL] UDAF Support
> ------------------------
>
> Key: SPARK-3947
> URL: https://issues.apache.org/jira/browse/SPARK-3947
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Pei-Lun Lee
> Assignee: Venkata Ramana G
>
> Right now only Hive UDAFs are supported. It would be nice to have UDAF
> similar to UDF through SQLContext.registerFunction.
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