uranusjr commented on issue #18050:
URL: https://github.com/apache/airflow/issues/18050#issuecomment-917404800


   The problem with quering is it could be quite expensive to find the correct 
number if you have a ton of existing `_copyX`, the time complexity is 
polynomial. IMO it’s good enough to simply refuse to duplicate `_copy1` if 
`_copy2` already exists amd show an error message to tell the user to first 
rename `_copy2` or duplicate `_copy2` instead.


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