Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/16337 Could we split the test suites based on the subquery types? - [With aliases](https://technet.microsoft.com/en-us/library/ms190410(v=sql.105).aspx). - With IN or NOT IN - [Subqueries with IN ](https://technet.microsoft.com/en-us/library/ms190963(v=sql.105).aspx) - [Subqueries with NOT IN](https://technet.microsoft.com/en-us/library/ms189062(v=sql.105).aspx). - [In UPDATE, DELETE, and INSERT statements](https://technet.microsoft.com/en-us/library/ms191223(v=sql.105).aspx). - [With comparison operators](https://technet.microsoft.com/en-us/library/ms190609(v=sql.105).aspx). - [With ANY, SOME, or ALL](https://technet.microsoft.com/en-us/library/ms187074(v=sql.105).aspx). - With EXISTS or NOT EXISTS. - [Subqueries with EXISTS ](https://technet.microsoft.com/en-us/library/ms189259(v=sql.105).aspx) - [Subqueries with NOT EXISTS](https://technet.microsoft.com/en-us/library/ms184297(v=sql.105).aspx). - [In place of an expression](https://technet.microsoft.com/en-us/library/ms189623(v=sql.105).aspx).
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