Github user davies commented on the pull request:

    https://github.com/apache/spark/pull/7143#issuecomment-117711886
  
    The hard part is that BinaryType could be used in ArrayType and MapType, we 
need to also fix them.
    
    As @marmbrus suggested, it's better to create a wrapper for BinaryType 
internal, let it handle hashCode and equality check. We can call it `Binary`, 
it's a large change.


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