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https://issues.apache.org/jira/browse/SPARK-6817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14592087#comment-14592087
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Shivaram Venkataraman commented on SPARK-6817:
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I think there are two separate issues here -- one is to add just UDFs which
will work on rows during Select / Filter etc. and UDAFs which will work on
grouped data. I think UDFs are the first step to do in SparkR as there is
already support for this in Scala, Python
Supporting UDAFs will be the next step but I think that will be blocked on
SPARK-3947
> DataFrame UDFs in R
> -------------------
>
> Key: SPARK-6817
> URL: https://issues.apache.org/jira/browse/SPARK-6817
> Project: Spark
> Issue Type: New Feature
> Components: SparkR, SQL
> Reporter: Shivaram Venkataraman
>
> This depends on some internal interface of Spark SQL, should be done after
> merging into Spark.
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