Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/14451 That assumes `JDBCRelation` does not extend `SchemaRelationProvider`. Yeah. That is right so far, but we do not know whether this might be changed. Normally, the best way is to add a test case for it. In this specific case, it is cheap to add the extra changes, and thus, we can add it anyway for code reading/maintenance.
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