Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/14136
@rxin this is a very contained patch. It only adds the percentile function.
The advantage here is that this further reduces our dependency on relatively
slow Hive UDAFs (one more to go), and that we don't have to put in horrible
patches like https://github.com/apache/spark/pull/16034.
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