Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14077
Thank you for confirming that it is a bug in another PR.
Regarding the solution of this PR, it is not a true circular reference. The
solution in this PR is to minimize the duplicate codes. I also think it make
senses to move the common code logics from `jdbc` API to `createRelation`
implementation of `CreatableRelationProvider`. The JDBC-specific logics should
not be exposed to the `DataFrameWriter` APIs.
If you wants to do it in your PR, I am also fine. Please minimize the code
changes and add the test cases introduced in this PR. Thanks!
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