Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/17770
more thoughts about
https://github.com/apache/spark/pull/17770#discussion_r117349872
If we add the `AnalysisBarrier` in `Dataset.logicalPlan`, and implement
`AnalysisBarrier.canonicalized` like `SubqueryAlias`, will it be simpler?
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