Github user mengxr commented on the pull request:

    https://github.com/apache/spark/pull/11379#issuecomment-197203735
  
    +1. There was a bug in SQL internal type conversions, which might call 
`serialize` twice. This is why `Any` was used. The bug was fixed but I forgot 
to change the type back.
    
    @yhuai Could you make a final pass?


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