Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4033#issuecomment-73241705
I take it back (see https://issues.apache.org/jira/browse/SPARK-5481) Yes,
there's evidence of JDBC 3 drivers in the wild, still, and because I confirmed
that `close()`ing these three objects is required to be a no-op if already
closed, so, this really can't hurt.
Similar changes should be made in `JDBCRDD.scala` in Spark SQL. Could you
update the PR to address that too?
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