Abacn commented on code in PR #37965:
URL: https://github.com/apache/beam/pull/37965#discussion_r3033285459


##########
sdks/python/apache_beam/runners/portability/portable_runner.py:
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@@ -332,7 +336,7 @@ def _optimize_pipeline(
         phases = []
         for phase_name in pre_optimize.split(','):
           # For now, these are all we allow.
-          if phase_name in ('pack_combiners', 'lift_combiners'):
+          if phase_name in ('pack_combiners', 'lift_combiners', 'expand_sdf'):

Review Comment:
   If there are compatibility/performance worries, this one is safer (opt in)



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