Jefffrey commented on issue #9302:
URL: 
https://github.com/apache/arrow-datafusion/issues/9302#issuecomment-1960912134

   > @Jefffrey But I think this cast should be an implicit conversion. If not, 
maybe we should indicate this in the tests and documentation.
   
   Yes, I think this is what I was trying to convey, that we should allow 
`log('100.0')` to be implicitly converted to `log(100.0)` since we can already 
cast from Utf8 to Float. I just might be wrong on the exact implementation 
details as I'm not as familiar with the internals of the function related code 
:slightly_smiling_face: 


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