Github user EntilZha commented on the pull request:

    https://github.com/apache/spark/pull/7580#issuecomment-124215462
  
    Makes sense, so shouldn't be a problem. Prior question still is open 
though, due to the not useful error message, should I explicitly write a 
`checkInputTypes` method or is there a way better way to express that still 
using `ExpectsInputTypes`? Perhaps I can override the method, do my custom 
checks, then call the overriden method (I assume there is a way to do this)?


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