Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10566#issuecomment-189507604
After more thinking, in my opinion, the best way is to add extra `Filter`
between two Join and let the existing Filter-condition-based rule to do outer
join elimination, but we need another rule to remove unnecessary Filter which
only contains Null constraints.
Let me first create a PR to do Filter removal/cleaning.
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