abhishekagarwal87 commented on issue #10644:
URL: https://github.com/apache/druid/issues/10644#issuecomment-739488916


   Interesting! `NumericAnyVectorAggregator` does it correctly by using a bit 
to differentiate initialized value vs a value from any row. May be, 
LongMaxVectorAggregator needs to do the same. 
   By the way, what is the output of the query if you set 
`druid.generic.useDefaultValueForNull` to `false`? It should be `null` ideally. 


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