TheNeuralBit commented on issue #22854:
URL: https://github.com/apache/beam/issues/22854#issuecomment-1227771515

   Hm actually the breakage is due to 
https://github.com/apache/beam/pull/22066, which is tougher to rollback.
   
   The core issue here is that PR started to mix beam typehints 
(RowTypeConstraint) and native typehints (typing.Optional). In all our test 
cases this was OK because the RowTypeConstraint was either the top-level, or if 
nested it was not nullable/optional, so it didn't need to be wrapped in a 
typing.Optional.


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