Github user gweidner commented on the pull request:

    https://github.com/apache/spark/pull/6023#issuecomment-100708005
  
    The modified ml/tests.py succeeded but the log shows the following error in 
last streaming/tests.py:
    Run ml tests ...
    Running test: pyspark/ml/feature.py ... ok (28s)
    Running test: pyspark/ml/classification.py ... ok (14s)
    Running test: pyspark/ml/tuning.py ... ok (9s)
    Running test: pyspark/ml/tests.py ... ok (7s)
    Running test: pyspark/ml/evaluation.py ... ok (11s)
    Run streaming tests ...
    Running test: pyspark/streaming/util.py ... ok (1s)
    Running test: pyspark/streaming/tests.py ... 
..................................F.....
    ======================================================================
    FAIL: test_count_by_value_and_window (__main__.WindowFunctionTests)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "pyspark/streaming/tests.py", line 418, in 
test_count_by_value_and_window
        self._test_func(input, func, expected)
      File "pyspark/streaming/tests.py", line 133, in _test_func
        self.assertEqual(expected, result)
    AssertionError: Lists differ: [[1], [2], [3], [4], [5], [6], [6], [6], [6], 
[6]] != [[1], [2], [3], [4], [5], [6], [6], [6]]
    
    First list contains 2 additional elements.
    First extra element 8:
    [6]
    
    - [[1], [2], [3], [4], [5], [6], [6], [6], [6], [6]]
    ?                                     ----------
    
    + [[1], [2], [3], [4], [5], [6], [6], [6]]
    
    ----------------------------------------------------------------------
    Ran 40 tests in 168.147s
    
    
    Trying to understand how the change could have impacted the streaming test 
and also see why not happening locally.


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