Reynold Xin commented on SPARK-10915:

It is indeed very complicated to implement UDAF in Python. That's why we have 
been asking.

One thing is we can think about allowing defining UDAFs using existing SQL 
expressions, and then it might be easier.

> 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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