Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/3718#issuecomment-67745756
In principle I agree with @rxin. We probably should be setting the job
group id and saving it so that if the users presses ctrl-c (or calls
`Statement#cancel()` from JDBC) we could use it to cancel the running job.
What seemed odd to me was to set it to something random and throw away that id.
Either way though, I'm okay with adding cancelation in a followup PR since
having the query in the UI is nice.
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