uranusjr commented on issue #28868:
URL: https://github.com/apache/airflow/issues/28868#issuecomment-1379867945

   The real problem is not actually the run ID, but the logical date (execution 
date), which also has a unique constraint, and can be identical if you schedule 
too fast. Even if the run ID duplication is fixed, you still can’t schedule 
multiple runs under the same logical date. So that’s the thing you must 
explicitly pass to `expand` (or `expand_kwargs`) if you want to use dynamic 
task mapping.


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