Github user marmbrus commented on the pull request: https://github.com/apache/spark/pull/13147#issuecomment-222263996 This is great! In order to commit this it would be good to explain what is happening in detail (I think I follow, but its very dense). I'd also like to see some tests to make sure that we are finding the first plan without going down any of the possible branches. One consideration: we might want to make at least the API parts of this make it into 2.0 since it makes plugging in strategies much more powerful and it does change this (experimental) interface.
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