bvaradar commented on issue #2131:
URL: https://github.com/apache/hudi/issues/2131#issuecomment-702072024


   @tandonraghavs : For compaction, the payload class defined in 
hoodie.properties is used for pre-combining. Can you check what is the payload 
class configured in hoodie.properties ?
   
   As you would have noticed, compaction would first pre-combines all delta 
records first before merging using combineAndGetUpdateValue. So, you would need 
to implement custom merging in preCombine method in your payload class. 
   
   IIUC, Oplogs are partial row image(updates). Wouldn't it be possible to 
employ the same merging logic that you were doing as part of 
combineAndGetUpdateValue ?
   
   Also, which version of Hudi are you using ? 


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