friendlymatthew commented on code in PR #7720:
URL: https://github.com/apache/arrow-rs/pull/7720#discussion_r2160335027


##########
parquet-variant/src/builder.rs:
##########
@@ -484,13 +486,33 @@ impl<'a> ObjectBuilder<'a> {
         }
     }
 
+    fn check_duplicate_field_name(&self, key: &str) -> Result<(), ArrowError> {
+        if let Some(field_name_id) = self.parent.dict.get(key) {
+            if self.fields.contains_key(field_name_id) {
+                return Err(ArrowError::InvalidArgumentError(
+                    "field name must be unique and already exists in this 
object".to_string(),
+                ));
+            }
+        }
+
+        Ok(())
+    }
+
     /// Add a field with key and value to the object
-    pub fn append_value<'m, 'd, T: Into<Variant<'m, 'd>>>(&mut self, key: 
&str, value: T) {
-        let id = self.parent.add_key(key);
+    pub fn append_value<'m, 'd, T: Into<Variant<'m, 'd>>>(

Review Comment:
   Yes, I was considering that, but chose to take the Variant spec literally. 
I'm happy to change the implementation however



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