yihua commented on code in PR #12991:
URL: https://github.com/apache/hudi/pull/12991#discussion_r2001740210


##########
hudi-common/src/main/java/org/apache/hudi/common/table/read/HoodieFileGroupReaderSchemaHandler.java:
##########
@@ -199,7 +199,8 @@ private static String[] 
getMandatoryFieldsForMerging(HoodieTableConfig cfg, Type
       }
     }
 
-    if (cfg.getRecordMergeMode() == RecordMergeMode.EVENT_TIME_ORDERING) {
+    if (cfg.getRecordMergeMode() == null
+        || cfg.getRecordMergeMode() == RecordMergeMode.EVENT_TIME_ORDERING) {

Review Comment:
   A better way is to return the inferred merge mode, `EVENT_TIME_ORDERING` or 
`COMMIT_TIME_ORDERING`, from `cfg.getRecordMergeMode()` for table version 6.



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