jonahgao commented on code in PR #12922:
URL: https://github.com/apache/datafusion/pull/12922#discussion_r1801248305


##########
datafusion/functions/src/macros.rs:
##########
@@ -226,9 +226,8 @@ macro_rules! make_math_unary_udf {
                     $EVALUATE_BOUNDS(inputs)
                 }
 
-                fn invoke(&self, args: &[ColumnarValue]) -> 
Result<ColumnarValue> {
-                    let args = ColumnarValue::values_to_arrays(args)?;
-
+                fn invoke(&self, col_args: &[ColumnarValue]) -> 
Result<ColumnarValue> {

Review Comment:
   The result after invoking is a `ColumnarValue`, and we can determine the 
number of rows .If a function might produce multiple rows for scalar args, it 
might not be appropriate to declare it as maintain_scalar 🤔.



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