lukoou3 opened a new issue, #14455:
URL: https://github.com/apache/druid/issues/14455

   Differences between Aggregator and BufferAggregator ?
   When are Aggregators and BufferAggregators used separately?
   I want to implement AggregatorFactory,but I don't know when Druid uses 
Aggregator and BufferAggregator respectively, and how efficient is it.


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