Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11234#issuecomment-185036566
It sounds like this PR is related to the following two PRs
https://github.com/apache/spark/pull/10567 and
https://github.com/apache/spark/pull/10566
If we can convert the outer joins to inner joins, the push down will be
done by the existing rules.
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