danny0405 commented on code in PR #13742:
URL: https://github.com/apache/hudi/pull/13742#discussion_r2308926474


##########
hudi-common/src/main/java/org/apache/hudi/common/model/HoodieAvroRecordMerger.java:
##########
@@ -19,51 +19,101 @@
 package org.apache.hudi.common.model;
 
 import org.apache.hudi.common.config.TypedProperties;
+import org.apache.hudi.common.engine.RecordContext;
 import org.apache.hudi.common.model.HoodieRecord.HoodieRecordType;
+import org.apache.hudi.common.table.read.BufferedRecord;
+import org.apache.hudi.common.table.read.BufferedRecords;
+import org.apache.hudi.common.util.ConfigUtils;
+import org.apache.hudi.common.util.HoodieRecordUtils;
 import org.apache.hudi.common.util.Option;
-import org.apache.hudi.common.util.collection.Pair;
 
 import org.apache.avro.Schema;
+import org.apache.avro.generic.GenericRecord;
 import org.apache.avro.generic.IndexedRecord;
 
 import java.io.IOException;
-import java.util.Properties;
 
 /**
  * Record merger for Hoodie avro record.
  *
  * <p>It should only be used for base record from disk to merge with incoming 
record.
  */
 public class HoodieAvroRecordMerger implements HoodieRecordMerger, 
OperationModeAwareness {
-  public static final HoodieAvroRecordMerger INSTANCE = new 
HoodieAvroRecordMerger();
+  public static final String PAYLOAD_CLASS_PROP = 
"_hoodie.merger.payload.class";

Review Comment:
   this is specific for expression payload?



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