Polber commented on PR #29234:
URL: https://github.com/apache/beam/pull/29234#issuecomment-1789366473

   @kennknowles They are declared so that they will be put into the 
schemio-expansion-service shaded jar so that users do not have to stage and 
specify a client driver when using the xlang JDBC schema transforms. This is 
especially useful for the YAML case which is supposed to abstract the details 
like this away from the end user. There is a comment about how they are staged 
for the schema transforms, but I can expand on the comment if you think it is 
necessary.


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