Reynold Xin commented on SPARK-10915:

BTW percentile on large data is very expensive and can easily OOM. I'd 
recommend using approximate version of it.

> 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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