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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