Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/20584
  
    > I am suspicious about relationship between afterEach() and 
addTaskCompletionListener (call close()). But, not sure. Let us try this 
approach first.
    
    This is one of my speculations. There 2 possibilities I can think of: 1) 
the task completion listener is not called before `afterEach`. 2) the orc 
columnar reader's `close` method doesn't close the file stream.
    
    For 1), seems we've fixed it in 
https://github.com/apache/spark/commit/c5a31d160f47ba51bb9f8a4f3141851034640fc7 
. For 2), I'm not sure and may need help from ORC folks.


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