Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/9775#issuecomment-157917739
@dtolpin could you add the following test to `WindowFunctionTests` in
`python/pyspark/streaming/tests.py`? It should reproduce the issue.
```Python
def test_reduce_by_key_and_window_with_none_invFunc(self):
input = [range(1), range(2), range(3), range(4), range(5), range(6)]
def func(dstream):
return dstream.map(lambda x: (x, 1))\
.reduceByKeyAndWindow(operator.add, None, 5, 1)\
.filter(lambda kv: kv[1] > 0).count()
expected = [[2], [4], [6], [6], [6], [6]]
self._test_func(input, func, expected)
```
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