Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/5188#issuecomment-86237457
The behavior you describe sounds like a reasonable default to me, but I'll
let @liancheng comment on the specifics.
Regarding making a pull request, generally these should be opened against
master unless this is a port to a specific branch that does not apply cleanly
to master. We will backport as needed when merging. We will also have to
reconcile this with #5141.
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