Josh Rosen created SPARK-12579:
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Summary: User-specified JDBC driver should always take precedence
Key: SPARK-12579
URL: https://issues.apache.org/jira/browse/SPARK-12579
Project: Spark
Issue Type: Bug
Components: SQL
Reporter: Josh Rosen
Assignee: Josh Rosen
Spark SQL's JDBC data source allows users to specify an explicit JDBC driver to
load using the {{driver}} argument, but in the current code it's possible that
the user-specified driver will not be used when it comes time to actually
create a JDBC connection.
In a nutshell, the problem is that you might have multiple JDBC drivers on your
classpath that claim to be able to handle the same subprotocol and there
doesn't seem to be an intuitive way to control which of those drivers takes
precedence.
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