Github user davies commented on the pull request:

    https://github.com/apache/spark/pull/8934#issuecomment-157095257
  
    @viirya This PR only help a two corner cases, and they are not blocker 
(could be easily workaround), I'd like to not fix these (avoid the complexity). 
If we merge this one, some one may continue to submit similar PR to address 
other corner cases. 
    
    BTW, There is a JIRA to suggest user to prefer using `c['column']` instead 
of `c.column`. 
    
    Does this make sense?


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