alamb commented on code in PR #16087:
URL: https://github.com/apache/datafusion/pull/16087#discussion_r2096357959


##########
datafusion/functions/src/string/ascii.rs:
##########
@@ -103,19 +103,22 @@ impl ScalarUDFImpl for AsciiFunc {
 
 fn calculate_ascii<'a, V>(array: V) -> Result<ArrayRef, ArrowError>
 where
-    V: ArrayAccessor<Item = &'a str>,
+    V: StringArrayType<'a, Item = &'a str>,
 {
-    let iter = ArrayIter::new(array);
-    let result = iter
-        .map(|string| {
-            string.map(|s| {
-                let mut chars = s.chars();
-                chars.next().map_or(0, |v| v as i32)
-            })
+    let values: Vec<_> = (0..array.len())
+        .map(|i| {
+            if array.is_null(i) {
+                0

Review Comment:
   That is my understanding as well -- it should be safe (in the rust sense) to 
look up an entry that is set to null



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