JDBCConnectionProvider in Spark

[Artemis User]

Could someone provide some insight/examples on the usage of this API? 
https://spark.apache.org/docs/latest/api/scala/org/apache/spark/sql/jdbc/JdbcConnectionProvider.html

Why is it needed since this is an abstract class and there isn't any 
concrete implementation of it?   Thanks a lot in advance.

-- ND

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