Omega359 commented on PR #12203:
URL: https://github.com/apache/datafusion/pull/12203#issuecomment-2315599859

   There are a few things I noted when I reviewed this pull request, some of 
which may be good to either fix here or in other tickets/PRs:
   
   - The return type includes Utf8View, but the code doesn't do that
   - The return type tests for Binary/LargeBinary/BinaryView/Dictionary but 
those are unsupported signature types
   - The signature is missing `Exact(vec![Utf8View, Utf8, Utf8, Utf8]),`
   - I don't see anywhere that the args are actually checked to have 3 or 4 
elements anymore
   - There are a bunch of macros in the tests that as best as I can see don't 
seem to be used at all. At least when I remove them the tests in that file all 
run. Given that I don't think the tests cover anything but StringArray as arg[0]
   


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