himanshug commented on issue #6381: datsketches extension updated to use the 
latest sketches-core-0.12.0
URL: https://github.com/apache/incubator-druid/pull/6381#issuecomment-429054163
 
 
   @AlexanderSaydakov  yes, SynchronizedUnion is not needed in buffer 
aggregators which are never used concurrently. Aggregator on the other hand 
gets used at "realtime" processes concurrently to index as well as query data.

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