sclukas77 opened a new pull request #12498: URL: https://github.com/apache/beam/pull/12498
Implemented ExternalSchemaIOTransformRegistrar that uses ServiceLoader to find implementations of SchemaIOProviders so that the ExternalTransformBuilder can defer to the buildReader(..) and buildWriter(..) function of the providers' SchemaIO subclasses. Implemented JdbcSchemaIOProvider to test cross language transforms using the new implementation. 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