Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/10957#issuecomment-175908190
A user is trying to get this working on 1.6 using the dataframe api. That
doesn't work directly because functions.scala misses the functions implemented
in this PR. The indirect approach using ```expr(...)``` doesn't work because
```WindowSpec``` does not support ```UnresolvedFunctions```.
I guess this is more a feature than a bug fix....
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