Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/3888#issuecomment-89093322
@saucam, thanks for working on this and sorry for the delay due to the 1.3
release. I think the best option here is to use statistics and only collect
when we know the size is going to be pretty small. It would also be good to
reconcile it with the other options for handling exist queries when the
statistics suggest the other table is large. Finally, we'll need a bunch of
tests for this new feature. Until you have time to update, I suggest we close
this issue to keep the PR queue small and manageable.
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