Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/3946#issuecomment-70782320
`group id` is look ok to me. now we create a uuid for each statement, and
save it to EventListener, later we can make a follow up PR to add the logical
that when user presses ctrl-c, use the group id of the statement to cancel the
job. Maybe we need add a `onStatementStop` interface to EventListener for that.
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