Jefffrey opened a new issue, #17291:
URL: https://github.com/apache/datafusion/issues/17291

   ### Is your feature request related to a problem or challenge?
   
   Original discussion: 
https://github.com/apache/datafusion/pull/17179#discussion_r2289772160
   
   It's hard to specify a type signature that includes an arbitrarily sized 
`FixedSizeBinary` as would need to specify each and every size; ideally would 
be solved by a wildcard, similar to how it's handled for `FixedSizeList`:
   
   Wildcard:
   
   
https://github.com/apache/datafusion/blob/f363e382661a4f45dad2912e9988f1703e46939b/datafusion/expr-common/src/signature.rs#L41-L44
   
   How wildcard is used:
   
   
https://github.com/apache/datafusion/blob/f363e382661a4f45dad2912e9988f1703e46939b/datafusion/expr/src/type_coercion/functions.rs#L877-L889
   
   ### Describe the solution you'd like
   
   Introduce a wildcard const for `FixedSizeBinary` to use during coercion
   
   ### Describe alternatives you've considered
   
   _No response_
   
   ### Additional context
   
   Fix any type signatures that use `FixedSizeBinary` to use this new wildcard, 
for example in #17179 code


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