jrmccluskey commented on PR #39236:
URL: https://github.com/apache/beam/pull/39236#issuecomment-5269114017

   Thinking about the branching path a little bit, that really only works for 
cases where you have a static map of schemas known at runtime and don't have 
side inputs or callable schema determination, since you can't change the shape 
of the DAG during runtime. It does explode the number of xlang calls too, since 
you're instantiating a cross-language transform per-schema.
   
   The point about create-on-write tables inheriting the union schema is right 
though, that is now documented and test cases use pre-existing tables now.


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