neilconway commented on code in PR #22575:
URL: https://github.com/apache/datafusion/pull/22575#discussion_r3328717747


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datafusion/functions/src/math/nanvl.rs:
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@@ -64,14 +65,8 @@ impl Default for NanvlFunc {
 impl NanvlFunc {
     pub fn new() -> Self {

Review Comment:
   Thanks for the suggestion! I believe that would also work, although maybe 
the error reporting for invalid input combinations wouldn't be as clear. 
Personally I think the `coerce_types` approach is a bit easier to understand 
and is more explicit in a helpful way, but LMK if you disagree.



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