alamb commented on code in PR #13458:
URL: https://github.com/apache/datafusion/pull/13458#discussion_r1847266643


##########
datafusion/expr/src/udf.rs:
##########
@@ -216,6 +217,15 @@ impl ScalarUDF {
         self.inner.is_nullable(args, schema)
     }
 
+    /// Returns the field metadata for this function.
+    pub fn metadata(

Review Comment:
   This feels similar in usecase to 
https://github.com/apache/datafusion/pull/13290 -- if we merged 
https://github.com/apache/datafusion/pull/13290 would that solve your usecase?



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