starocean999 opened a new pull request, #15547:
URL: https://github.com/apache/doris/pull/15547

   # Proposed changes
   this pr is follow up of https://github.com/apache/doris/pull/14964
   
   ## Problem summary
   consider the query bellow:
   
   _SELECT *
   FROM subquery1
   WHERE subquery1.k1 < 
       (SELECT max(aa)
       FROM 
           (SELECT k1 AS aa
           FROM subquery3
           WHERE subquery1.k2 = subquery3.v2) subquery3);_
   
   change agg function to nullable check if there is any group by exprs. The 
subquery unnesting will create a group by expr. So we have to move the subquery 
unnest rule before AdjustAggregateNullableForEmptySet rule
   
   ## Checklist(Required)
   
   1. Does it affect the original behavior: 
       - [ ] Yes
       - [ ] No
       - [ ] I don't know
   2. Has unit tests been added:
       - [ ] Yes
       - [ ] No
       - [ ] No Need
   3. Has document been added or modified:
       - [ ] Yes
       - [ ] No
       - [ ] No Need
   4. Does it need to update dependencies:
       - [ ] Yes
       - [ ] No
   5. Are there any changes that cannot be rolled back:
       - [ ] Yes (If Yes, please explain WHY)
       - [ ] No
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   
   


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