Github user wangyum commented on the issue:
https://github.com/apache/spark/pull/23170
It's not a regression. The first check exists in
[2.1.0](https://github.com/apache/spark/blob/v2.1.0/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCOptions.scala#L99-L102)
and the second check is added in
[2.4.0](https://github.com/apache/spark/blob/v2.4.0/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCOptions.scala#L133-L143).
cc @dilipbiswal
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