Abacn opened a new pull request, #38325:
URL: https://github.com/apache/beam/pull/38325

   Follow up of #38206
   
   #38206 added portable representation to pythonsdk_any logical type, making 
it recognizable by foreign SDK. However there are two cases we get 
pythonsdk_any in schema.py:
   
   - typehints not covered by all previous cases, including user types or third 
party types. They'are going to be encoded with FastPrimitveCoder's 
"UNKNOWN_TYPE" branch, that is a type byte + pickled bytes
   
   - true "typing.Any" typehint. In this case, the field may carry Python 
primitive values, it's encoded form doesn't fit its representation, causing 
coder errors at runtime
   
   This change then restore the original form of pythonsdk_any logical type's 
schema pb2 definition that is the representation is absent for the second case.
   
   This is found when revisiting an old StackOverFlow question: 
https://stackoverflow.com/questions/65903919/local-testing-apache-beam-with-sqltransform-in-python-sdk-i-receive-an-error
 mentioned in #20738.
   
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