robertwb opened a new pull request, #30793:
URL: https://github.com/apache/beam/pull/30793

   We use the schema transform discovery service to determine all the 
transforms that a given provider vends which may be larger than those that were 
explicitly declared (e.g. the basic mapping transforms are part of java core) 
and use this to expand the possible set of transforms this provider can be used 
to instanciate (attaching the appropreate renaming, etc. as needed). This can 
greatly increase the chances that we can use the same provider, and hence same 
SDK and environment, for adjacent steps.
   
   This is done lazily as transforms are used to avoid instanciating all 
possible providers for all pipelines.
   
   
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