Github user rxin commented on the pull request:

    https://github.com/apache/spark/pull/12470#issuecomment-211589128
  
    @JasonMWhite you said in the jira ticket that there were a few bugs 
exposed. Can you submit those too?
    
    I talked more with @davies offline. I think the main problem here is that 
column names can have duplicates, and in those cases it is difficult to define 
what the correct behavior is if the equality check is column-order-agnostic.


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