Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15546
@dongjoon-hyun I have a general comment about the SQL generation fixes. Not
sure how you fix the issue. Normally, when we did it, we need to see the
analyzed SQL plan. In this case, it becomes a little complex, we called
`addSubqueryIfNeeded` in `toSQL`.
Could you try to show reviewers the failed plans with the added
`SubqueryAlias`? Then, we can discuss whether the fix coverage and test case
coverage.
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