Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/4017#issuecomment-70920763
I was fine with #4040 because coalesce requires some very special case
casting logic that is already implemented. But I want to block further addition
of UDFs directly into the parser until we fix
[SPARK-4867](https://issues.apache.org/jira/browse/SPARK-4867)
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