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https://issues.apache.org/jira/browse/SPARK-10915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15581031#comment-15581031
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Reynold Xin commented on SPARK-10915:
-------------------------------------

What's the use case? Is it not possible to just run df.rdd.reduceByKey? The 
main issue is that it is actually very convoluted and complex to implement this 
properly.


> Add support for UDAFs in Python
> -------------------------------
>
>                 Key: SPARK-10915
>                 URL: https://issues.apache.org/jira/browse/SPARK-10915
>             Project: Spark
>          Issue Type: Improvement
>          Components: PySpark, SQL
>            Reporter: Justin Uang
>
> This should support python defined lambdas.



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