Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/7478#issuecomment-123436858
You can add new functions to `FunctionRegistry`.
You are right that you can't do a groupBy on a string like that, but with
https://issues.apache.org/jira/browse/SPARK-8668 you will be able to do
`df.groupBy(expr("spark__partition__id()"))`. If we add something to
functions.scala you could also just do `df.groupBy(spark__partition__id())`
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