Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/9326#issuecomment-151934042
Actually, `sameResult` will remove `SubQuery` nodes. I think the problem is
that `cleanRight.cleanArgs == cleanLeft.cleanArgs` returns false when two
`LogicalRelation`s are considered generating the same result (because of
`expectedOutputAttributes` that we added in #8889 ). I think the right fix is
to correctly override the `cleanArgs` field of `LogicalRelation` to exclude
`expectedOutputAttributes`.
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