Github user marmbrus commented on the pull request:

    https://github.com/apache/spark/pull/11443#issuecomment-194433231
  
    @liancheng java users can cast, `Row[] data = (Row[]) df.collect()`, also 
its not clear to me that creating a java list needs to be expensive.  I would 
assume that we can just create a thin wrapper object over an array.


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