Jackie-Jiang opened a new pull request, #17685:
URL: https://github.com/apache/pinot/pull/17685

   For complex field type, serialize the default null value into string format 
so that it is safe to read
   
   When reading an `Object` from JSON, java will read it as java object, while 
scala will read it as scala object. In order to have consistent behavior, store 
default null value as serialized string to ensure value is always read as java 
List/Map.
   
   ## Behavior change
   Non-default default null value for complex fields will be stored as 
serialized string.


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