zhang-arvin commented on PR #18575:
URL: 
https://github.com/apache/dolphinscheduler/pull/18575#issuecomment-5433041884

   @SbloodyS Thanks for the detailed review! I have updated the PR description 
to follow the template.
   
   Regarding the VarPool concern — I understand your point about preserving 
upstream OUT parameters. However, the key insight is that legitimate upstream 
OUT parameters (e.g., from a shell task preceding the sub-workflow) are already 
passed through `commandParam.getCommandParams()`. The 
`workflowInstance.getVarPool()` accumulates ALL OUT parameters from the entire 
parent workflow, including sibling branches that have no dependency 
relationship with the sub-workflow task.
   
   Removing `workflowInstance.getVarPool()` from the merge therefore:
   1. Preserves valid upstream OUT parameters (via commandParams)
   2. Eliminates sibling branch parameter pollution
   3. Prevents parameter duplication
   
   Could you take another look when you have a chance?
   


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