leventov opened a new issue #5671: Generify AggregatorFactory  and 
PostAggregator
URL: https://github.com/apache/incubator-druid/issues/5671
 
 
   If the generic parameter is called `T`, the return type of `compute()` 
should be `T` and the return type of `getComparator()` should be `Comparator<? 
super T>`.
   
   Although `PostAggregator` is an `ExtensionPoint` this should be a compatible 
change, because generics in Java were designed to support compatible transition.

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