Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/6902#issuecomment-114595980
Yeah, that would be awesome where possible. Unfortunately, I think we may
also need to add back in a version of `callUDF` that takes in `DataType`s for
its input and output parameters. In some places [like
this](https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/Transformer.scala#L119)
no `TypeTags` are available for `udf` to use for inference.
/cc @mengxr
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