waterWang opened a new pull request, #18545:
URL: https://github.com/apache/dolphinscheduler/pull/18545

   Fixes #18543
   
   ## Problem
   `findLastTaskInstances` was joining on `max(end_time)`, but `end_time` is a 
MySQL `datetime` without fractional seconds, so two task attempts finishing in 
the same second produce duplicate rows for the same task code. This causes 
`Collectors.toMap` to throw `IllegalStateException: Duplicate key` in 
`DependentExecute#dependResultByAllTaskOfWorkflowInstance.
   
   ## Fix
   Use `max(id)` instead of `max(end_time)` — `id` is an auto-increment primary 
key, guaranteeing uniqueness per task code.


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