tustvold commented on a change in pull request #1469:
URL: https://github.com/apache/arrow-rs/pull/1469#discussion_r836182203



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File path: arrow/src/array/equal/union.rs
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@@ -0,0 +1,171 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+use crate::datatypes::Field;
+use crate::{
+    array::ArrayData, buffer::Buffer, datatypes::DataType, 
datatypes::UnionMode,
+};
+
+use super::{
+    equal_range, equal_values, utils::child_logical_null_buffer, 
utils::equal_nulls,
+};
+
+// Checks if corresponding slots in two UnionArrays are same data types
+fn equal_types(

Review comment:
       In the case of two fields with the same type, I believe these must still 
have field names and therefore there is a logical difference between values 
stored in one vs the other. I'm not sure about this though, possibly worth an 
upstream clarification 🤔
   
   On the case of different field ordering the arrays can never compare equal 
as they have different data types.




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