Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/8821#issuecomment-149656196
It is valid for columns to be unresolved at this point. Consider
`df.drop(col("columnName"))`. From the standpoint of a user, I guess I would
expect this to work, though its a little odd that we are changing semantics
that were explicitly tested to be a no-op before. Perhaps @rxin has some
reasoning for the current behavior?
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