tvalentyn commented on a change in pull request #13175:
URL: https://github.com/apache/beam/pull/13175#discussion_r573235644



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File path: sdks/python/apache_beam/transforms/stats_test.py
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@@ -482,13 +482,74 @@ def test_alternate_quantiles(self):
           equal_to([["ccccc", "aaa", "b"]]),
           label='checkWithKeyAndReversed')
 
+  def test_batched_quantiles(self):

Review comment:
       Given that a typo that creeps in might not be discovered until the code 
runs on a sufficiently large input, I'd be more comfortable merging this if we 
added targeted unit tests just for methods in question, exercising the logic 
that is not exercised in direct runner test due to small size/undeterminism. 




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