Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/8755#issuecomment-142345267
This is a simple fix and it works. However, it still seems hacky to me and
I'm thinking about introducing an `UnresolvedGenerate`. That will require more
code changes and I'm not sure if we should do it. Maybe we should merge this
one first.
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