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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