Tobi Bosede commented on SPARK-10915:

Ah ok. Well maybe we can implement an interquartile (IQR) range aggregate 
function specifically as another measure of spread in addition to sample and 
population variance. I believe percent_rank give percentile/quantile, but the 
documentation on this is not clear. It is a window function I believe. Not sure 
if it can be used as an aggregate function. If so an interquartile aggregate 
function would be easy. 

Also, is [~mgummelt] the right Michael to comment on UDAFs in spark? He has not 

> 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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