zjregee commented on PR #14812:
URL: https://github.com/apache/datafusion/pull/14812#issuecomment-2674530942

   Hi, @jayzhan211. I encountered some problems when trying to discard 
`TypeSignature::String`. 
   
   After a simple direct replacement, the original test failed. The specific 
test failure items are shown in this 
https://github.com/apache/datafusion/actions/runs/13457031878/job/37603204917?pr=14812.
   
   I think the problem may be caused by the need to modify the logic of this 
part of the code in this function 
https://github.com/zjregee/datafusion/blob/replace-type-signature/datafusion/expr/src/type_coercion/functions.rs#L603-L636,
 but I am not sure, and hope to get some help and suggestions.


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