vegarsti commented on PR #17891:
URL: https://github.com/apache/datafusion/pull/17891#issuecomment-3367964880

   > Thanks @vegarsti I would love to see if there any performance 
degradations, you can find benches in the project.
   > 
   > Maybe we can have a separate test for this issues?
   
   I added two test cases to show the change in this PR. On main these both 
return an empty vector, but with this PR the nullability is preserved, so in 
the first one (4) it's `None` and in the second one (5) it's `Some` empty vec.


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