himanshug commented on issue #263: Theta sketch - Concurrent union 
implementation
URL: 
https://github.com/apache/incubator-datasketches-java/issues/263#issuecomment-509836845
 
 
   >  assume aggregation at query time are executed in memory, even when data 
already resides on disk.
   What I suggest here is to consider a way to expedite query processing by 
having multiple threads (can be a small number) executing the aggregation in 
parallel, instead of sequentially by a single thread.
   
   At one index/aggregator level , it might look like that we are not 
exploiting all available cores and adding concurrency might help. However, in 
reality there are many queries running concurrently, each individual query is 
further split into per segment scan/aggregation job thats runs concurrently. 
That does exhaust available cores.
   

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