lukecwik commented on a change in pull request #15757:
URL: https://github.com/apache/beam/pull/15757#discussion_r733202648



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File path: sdks/python/apache_beam/transforms/combiners.py
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@@ -365,6 +365,10 @@ def push(hp, e):
               for element in bundle
           ]
           continue
+        # TODO(robertwb): Remove once legacy dataflow correctly handles

Review comment:
       The test passes because `list(iterable)` walks the entire `iterable` 
loading it into memory as a `list` type. `list` type supports `len` and 
`reverse`. I'm still unclear as to why the Dataflow deprecation will resolve 
this.




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