[GitHub] [pinot] deemoliu commented on pull request #7906: Add global strategy for partial upsert

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deemoliu commented on pull request #7906:
URL: https://github.com/apache/pinot/pull/7906#issuecomment-1013472410


   > Quick comment: the existing code does not define any default strategy for any column (eg: OVERWRITE). So instead of introducing a new property, can we simply define a default strategy (eg: within UpsertConfig). (of course null handling is still needed). CC @yupeng9 @Jackie-Jiang
   
   Hi @icefury71 thanks for the comment. The current behavior for columns not specify is "OVERWRITE even if the fieldValue of the new record is null". In this PR, i updated the default value to use "OVERWRITE unless the fieldValue of new record is null", which is the same behavior for overwrite merger.  
   I think @Jackie-Jiang  mentioned updating this will introduce backward incompatibility and @yupeng9 mentioned we should get the best possible default option. 
   
   @icefury71 @yupeng9 @Jackie-Jiang what do you think?


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