Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10454#issuecomment-167138258
The new fix contains two parts:
1) Since the full outer join will remove the duplicates, we are unable to
add the extra `limit` to both sides. As long as we can ensure the completeness
of one Child, the generated results will be still correct like the left/right
outer join.
2) There are `Projection` on top of most `Join` operators. We also can push
through this kind of combination.
Thank you for your reviews and comments! @yhuai @cloud-fan @viirya
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