prashantwason commented on a change in pull request #4067:
URL: https://github.com/apache/hudi/pull/4067#discussion_r755742592



##########
File path: hudi-common/src/main/avro/HoodieMetadata.avsc
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@@ -23,7 +23,10 @@
     "fields": [
         {
             "name": "key",
-            "type": "string"
+            "type": [

Review comment:
       null is not needed here as instead of nulling this field you can store 
an empty string.
   
   The type=null signifies that this field may be missing from the record. 




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