Reynold Xin commented on SPARK-10915:

They don't have Python API yet (nor Scala API), but you can call 
expr("percentile(xxx)"), or expr("percentile_approx(xxx)")

> 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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