claudevdm commented on code in PR #34484:
URL: https://github.com/apache/beam/pull/34484#discussion_r2025261569


##########
sdks/python/apache_beam/runners/portability/fn_api_runner/fn_runner.py:
##########
@@ -388,7 +388,8 @@ def create_stages(
             translations.lift_combiners,
             translations.expand_sdf,
             translations.expand_gbk,
-            translations.sink_flattens,
+            translations.fix_flatten_coders,
+            # translations.sink_flattens,

Review Comment:
   To be clear, this PR isn't fixing the underlying issue, rather it is 
disabling the optimization?
   
   Can we add a comment referencing why this is disabled, with reference to the 
bug?
   
   Also I am not sure if the tradeoff between disabling this optimization is 
worth fixing this specific edge-case, maybe @damccorm has thoughts?



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