reuvenlax commented on issue #27848:
URL: https://github.com/apache/beam/issues/27848#issuecomment-1666640122

   https://github.com/apache/beam/issues/27848 is a POC PR.
   
   Note that validating from the schema is a bit tricky. We can't simply 
convert the BQ schema to a proto descriptor and validate it matches, because 
the mapping is not 1:1. There are multiple valid proto descriptors that might 
all map to the same BQ schema.
   
   I would be inclined to not implement autoUpdateSchema for now - TableRows 
are naturally more dynamic, and a better fit for this (though we could in 
theory use the proto's unknown fieldset).
   
   I would also not implement automatic CDC here. The user can always do it 
themselves by adding the fields to their proto.


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