mattisonchao commented on PR #24751:
URL: https://github.com/apache/datafusion/pull/24751#issuecomment-5580329128

   Sure—I temporarily changed an `nvl` argument name from `expression1` to 
`expression-1` and ran the new test. It failed with:
   
   ```text
   UDF argument names must use underscores instead of hyphens:
   nvl: expression-1
   ```
   
   After reverting the invalid argument name, the test passes again.


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