jayzhan211 commented on code in PR #14268:
URL: https://github.com/apache/datafusion/pull/14268#discussion_r1928519797


##########
datafusion/functions/src/string/ascii.rs:
##########
@@ -61,7 +64,15 @@ impl Default for AsciiFunc {
 impl AsciiFunc {
     pub fn new() -> Self {
         Self {
-            signature: Signature::string(1, Volatility::Immutable),
+            signature: Signature::one_of(
+                vec![
+                    TypeSignature::String(1),
+                    TypeSignature::Coercible(vec![TypeSignatureClass::Native(

Review Comment:
   If we use `coercible(string)`, we don't need `string` since it is a more 
strict rule.



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