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https://issues.apache.org/jira/browse/SPARK-10915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15581127#comment-15581127
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Tobi Bosede commented on SPARK-10915:
-------------------------------------

It is complicated to implement a UDAF in python? If you read the email thread 
at the link, you will see people are interested in using a UDAF in sql 
statements as well as spark sql methods. In my case I wanted to do a pivot and 
have a UDAF for inter-quartile (IQR) range applied. Do you think 
df.rdd.reduceByKey would make sense here?

> 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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