U0001F3A2 commented on PR #23676:
URL: https://github.com/apache/datafusion/pull/23676#issuecomment-6206541330

   Thanks for the suggestion! I tested the width-specific signatures, and they 
fix the execution issue, so the runtime casts can be removed. The return-type 
and simplification fixes are still needed: simplify can see uncoerced 
arguments, and log(Float16 base, Float64 1) otherwise produces a Float16 zero. 
I also added typed-NULL handling so log(NULL, 1) stays NULL. The local 
candidate passes 339 function tests and the math/scalar SQL tests.


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