ryanthompson591 commented on code in PR #22984:
URL: https://github.com/apache/beam/pull/22984#discussion_r972405446


##########
CHANGES.md:
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@@ -66,7 +66,7 @@
 
 ## Breaking Changes
 
-* X behavior was changed ([#X](https://github.com/apache/beam/issues/X)).
+* Python SDK CoGroupByKey outputs an iterable allowing for arbitrarily large 
results. [#21556](https://github.com/apache/beam/issues/21556) See 
[document](https://docs.google.com/document/d/1RIzm8-g-0CyVsPb6yasjwokJQFoKHG4NjRUcKHKINu0)
 for suggested fixes for different error cases that assumed a list type was 
returned.

Review Comment:
   ```suggestion
   * Python SDK CoGroupByKey outputs an iterable allowing for arbitrarily large 
results. [#21556](https://github.com/apache/beam/issues/21556) Beam users may 
see a type or other runtime error on transforms downstream from CoGroupByKey. 
Users must change methods expecting a List to expect an Iterable going forward. 
See 
[document](https://docs.google.com/document/d/1RIzm8-g-0CyVsPb6yasjwokJQFoKHG4NjRUcKHKINu0)
 for information and fixes.
   ```



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