Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11208#issuecomment-184466379
`Star Expansion` only works when the star are in a `UnresolvedFunction`.
So far, Spark SQL does not handle star expansion when we use `star` in the
DataFrame or DataSet functions. That is the reason I chose this title. Let me
change it.
Actually, I am not sure if `CreateStruct` and `Count` are the only two
functions that can accept `star`. Could you help me confirm it? Thanks!
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