jayzhan211 commented on code in PR #9980:
URL: https://github.com/apache/arrow-datafusion/pull/9980#discussion_r1557712998


##########
datafusion/functions-array/src/lib.rs:
##########
@@ -139,13 +326,16 @@ pub fn register_all(registry: &mut dyn FunctionRegistry) 
-> Result<()> {
         replace::array_replace_all_udf(),
         replace::array_replace_udf(),
     ];
+
+    // TODO: Remove. Define in array_functions directly
     functions.into_iter().try_for_each(|udf| {

Review Comment:
   We are register functions here, so instantiation should we avoided. Only 
when we call `get_udf`, is time we instantiate the function.



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