aokolnychyi commented on PR #36303:
URL: https://github.com/apache/spark/pull/36303#issuecomment-1105745203

   Alright, I think we will need both.
   
   - PR #36216 does not solve the problem in `identifyRootFields` and tests 
from this PR fail.
   - This PR does not address the problem of conflicting names, which is solved 
by PR #36216.
   
   After this PR, the output returned by `PushDownUtils$pruneColumns` will only 
include columns from one relation. However, we still apply 
`ProjectionOverSchema` on filters with subqueries that may reference other 
relations too. That's why we need both changes.
   
   @allisonwang-db, what do you think?


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