Github user navis commented on the pull request:
https://github.com/apache/spark/pull/8909#issuecomment-146104351
@davies I love the idea removing thread-local, which caused headache for me
doing #7118. One thing I like to see also fixed in here is that jdbc meta calls
like "connection.getMetaData" is not working currently because it's executed
via exec-hive, which sees dummy-derby metastore.
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