Copilot commented on code in PR #17:
URL: https://github.com/apache/sedona-db/pull/17#discussion_r2332028396


##########
rust/sedona-expr/src/scalar_udf.rs:
##########
@@ -594,28 +668,53 @@ mod tests {
         
assert!(ArgMatcher::is_geometry_or_geography().match_type(&WKB_GEOGRAPHY));
         assert!(!ArgMatcher::is_geometry_or_geography()
             .match_type(&SedonaType::Arrow(DataType::Binary)));
+        assert_eq!(ArgMatcher::is_geometry_or_geography().type_if_null(), 
None);
 
         assert!(ArgMatcher::is_geometry().match_type(&WKB_GEOMETRY));
         assert!(!ArgMatcher::is_geometry().match_type(&WKB_GEOGRAPHY));
+        assert_eq!(ArgMatcher::is_geometry().type_if_null(), 
Some(WKB_GEOMETRY));
 
         assert!(ArgMatcher::is_geography().match_type(&WKB_GEOGRAPHY));
         assert!(!ArgMatcher::is_geography().match_type(&WKB_GEOMETRY));
+        assert_eq!(
+            ArgMatcher::is_geography().type_if_null(),
+            Some(WKB_GEOGRAPHY)
+        );
 
         
assert!(ArgMatcher::is_numeric().match_type(&SedonaType::Arrow(DataType::Int32)));
         
assert!(ArgMatcher::is_numeric().match_type(&SedonaType::Arrow(DataType::Float64)));
+        assert_eq!(
+            ArgMatcher::is_numeric().type_if_null(),
+            Some(SedonaType::Arrow(DataType::Float64))
+        );
 
         
assert!(ArgMatcher::is_string().match_type(&SedonaType::Arrow(DataType::Utf8)));
         
assert!(ArgMatcher::is_string().match_type(&SedonaType::Arrow(DataType::Utf8View)));
         
assert!(ArgMatcher::is_string().match_type(&SedonaType::Arrow(DataType::LargeUtf8)));
         
assert!(!ArgMatcher::is_string().match_type(&SedonaType::Arrow(DataType::Binary)));
+        assert_eq!(
+            ArgMatcher::is_string().type_if_null(),
+            Some(SedonaType::Arrow(DataType::Utf8))
+        );
 
         
assert!(ArgMatcher::is_binary().match_type(&SedonaType::Arrow(DataType::Binary)));
         
assert!(ArgMatcher::is_binary().match_type(&SedonaType::Arrow(DataType::BinaryView)));
         
assert!(!ArgMatcher::is_binary().match_type(&SedonaType::Arrow(DataType::Utf8)));
+        assert_eq!(
+            ArgMatcher::is_binary().type_if_null(),
+            Some(SedonaType::Arrow(DataType::Binary))
+        );
 
         
assert!(ArgMatcher::is_boolean().match_type(&SedonaType::Arrow(DataType::Boolean)));
         
assert!(!ArgMatcher::is_boolean().match_type(&SedonaType::Arrow(DataType::Int32)));
 
+        
assert!(ArgMatcher::is_null().match_type(&SedonaType::Arrow(DataType::Null)));
+        
assert!(!ArgMatcher::is_null().match_type(&SedonaType::Arrow(DataType::Int32)));
+        assert_eq!(
+            ArgMatcher::is_boolean().type_if_null(),
+            Some(SedonaType::Arrow(DataType::Boolean))
+        );
+
         
assert!(ArgMatcher::is_null().match_type(&SedonaType::Arrow(DataType::Null)));
         
assert!(!ArgMatcher::is_null().match_type(&SedonaType::Arrow(DataType::Int32)));

Review Comment:
   Lines 711-712 and 718-719 contain identical test assertions for 
`ArgMatcher::is_null()`. This duplicated code should be removed to improve 
maintainability.
   ```suggestion
   
   ```



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