Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/11555#issuecomment-194184747
>> Now, if we just replace it by the identical subquery name, they will
lose the original qualifiers.
I think it's not true. Every added subquery will have a unique name, so we
won't have same qualifiers from left and right child of a `Join`.
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