wombatu-kun commented on code in PR #12772:
URL: https://github.com/apache/hudi/pull/12772#discussion_r2094766763


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hudi-spark-datasource/hudi-spark4-common/pom.xml:
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@@ -0,0 +1,258 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0";
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd";>
+    <parent>
+        <artifactId>hudi-spark-datasource</artifactId>
+        <groupId>org.apache.hudi</groupId>
+        <version>1.1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>hudi-spark4-common</artifactId>

Review Comment:
   > Do we need a separate `hudi-spark4-common` module? If almost all classes 
are shared with Spark 3 (`hudi-spark3-common`), it's better to move the shared 
classes to `hudi-spark-common` and move the rest to Spark 4.0 module.
   
   Many classes are shared but not all. I'll try to avoid code duplication, but 
the `hudi-spark4-common` module is better to create right now at least as a 
foundation for the future (as 4.0 will not be the only version in Spark 
4.x-generation, so it will be useful later).



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