Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1163#issuecomment-46764715
Regarding testing we will probably want to pull all of our various join
tests out into a separate test suite that can be run with various options
turned on an off so we exercise all of the edge cases for each of the join
operators. This is going to become more important as we add more and more join
types so I think its worth putting some time into it.
Towards that we might consider breaking this PR into a few pieces. Get the
new join type / testing in soon. Add the auto selection / cost estimation in a
follow up.
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