Github user tmyklebu commented on the pull request:
https://github.com/apache/spark/pull/5633#issuecomment-95428960
Do the MySQL and Postgres integration tests both pass with this change?
It's not a security issue per se. The trouble is that JDBC's security
stuff "fails closed" and it won't be able to find the driver if it wasn't
loaded with the right class loader. I believe it does this so that untrusted
code can't compromise other code by polluting the driver cache.
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