Github user susanxhuynh commented on the issue:

    https://github.com/apache/spark/pull/20641
  
    Thanks for the PR! It seems that the previous attempt to fix this 
(SPARK-18114) was wrong -- I'm not sure why we didn't catch the problem before, 
maybe lack of testing? @krcz My suggestion for this patch is to add a test, in 
order to prevent another regression in the future. I've written a unit test for 
this -- you could do something similar:  
https://github.com/mesosphere/spark/commit/4812ba3d10264f6d22ec654fa16b5810d70c27a9
 I will also do more testing with my own integration tests. cc @skonto 


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