jackwener opened a new pull request, #19441:
URL: https://github.com/apache/doris/pull/19441

   # Proposed changes
   
   Issue Number: close #xxx
   
   ## Problem summary
   
   We shouldn't push top Project of JoinCluster in PushdownProjectThroughJoin
   
   like 
   
   ```
    *      Project  (id + 1) if this project is top project of Join Cluster
    *        |     
    *       Join   
    *      /      \         
    *    Join  Join
    *    /  ....
    * Join
   ``` 
   
   we just pushdown project inside Join Cluster
   
   ## Checklist(Required)
   
   * [ ] Does it affect the original behavior
   * [ ] Has unit tests been added
   * [ ] Has document been added or modified
   * [ ] Does it need to update dependencies
   * [ ] Is this PR support rollback (If NO, please explain WHY)
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[[email protected]](mailto:[email protected]) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   
   


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