dongkelun commented on code in PR #5478:
URL: https://github.com/apache/hudi/pull/5478#discussion_r964283533


##########
hudi-common/src/main/avro/HoodieCleanMetadata.avsc:
##########
@@ -23,6 +23,7 @@
      {"name": "timeTakenInMillis", "type": "long"},
      {"name": "totalFilesDeleted", "type": "int"},
      {"name": "earliestCommitToRetain", "type": "string"},
+     {"name": "lastCompletedCommitTimestamp", "type": "string", "default" : 
""},

Review Comment:
   As I mentioned earlier, the main reason is to be compatible with the old 
version. The default value should not be null,
   ```scala
   numCommits = 
commitTimeline.findInstantsAfter(lastCompletedCommitTimestamp).countInstants()
   ```
   Null and empty return different results



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