Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/6597#issuecomment-108518882
  
    I did (and still do) have concerns, because upgrading a dependency changes 
the classpath user applications see. And now, suddenly, all the old `parquet.*` 
packages are going to disappear, which may affect existing user applications.
    
    I don't know enough about Spark's use of parquet to know whether any 
parquet types end up leaking through the API somehow, though. If that case 
doesn't exist, then this change would be a little more palatable. But, 
generally, upgrading dependencies like this is a little bit sketchy from a 
user's perspective.


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