danny0405 commented on code in PR #4676:
URL: https://github.com/apache/hudi/pull/4676#discussion_r970283021


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hudi-common/src/main/java/org/apache/hudi/common/model/PartialUpdateAvroPayload.java:
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@@ -0,0 +1,122 @@
+/*
+ * 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.
+ */
+
+package org.apache.hudi.common.model;
+
+import org.apache.avro.Schema;
+import org.apache.avro.generic.GenericRecord;
+import org.apache.avro.generic.IndexedRecord;
+
+import org.apache.hudi.avro.HoodieAvroUtils;
+import org.apache.hudi.common.util.Option;
+import org.apache.hudi.common.util.StringUtils;
+
+import java.io.IOException;
+import java.util.Properties;
+
+/**
+ * subclass of OverwriteNonDefaultsWithLatestAvroPayload used for delta 
streamer.
+ *

Review Comment:
   ```java
   Payload that supports partial update/merge.
   
   <p> For example we have schema: xxx and record old: xxx and new: xxx,
           the merging strategy is as follows:
           1. 
           2.
   ```



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