damccorm opened a new issue, #20029:
URL: https://github.com/apache/beam/issues/20029

   Setting \--experiments=pre_optimize=all causes an error with StatisticsGen 
in the TFX taxi example pipeline [1]:
   
     File 
"[redacted]/apache_beam/runners/portability/fn_api_runner_transforms.py", line 
250, in executable_stage_transform
       environment=components.environments[self.environment],
   TypeError: None has type NoneType, but expected one of: bytes, unicode 
[while running 'Run[StatisticsGen]']
   
   cc [~angoenka]
   
   [1] 
https://github.com/tensorflow/tfx/blob/ff314a6803675548c89a016a5110a91e5bf98024/tfx/examples/chicago_taxi_pipeline/taxi_pipeline_portable_beam.py#L155
   
   Imported from Jira 
[BEAM-9445](https://issues.apache.org/jira/browse/BEAM-9445). Original Jira may 
contain additional context.
   Reported by: ibzib.


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