AlexanderSaydakov commented on a change in pull request #6381: datsketches 
extension updated to use the latest sketches-core-0.12.0
URL: https://github.com/apache/incubator-druid/pull/6381#discussion_r224642513
 
 

 ##########
 File path: 
extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/theta/SketchAggregator.java
 ##########
 @@ -42,7 +42,7 @@ public SketchAggregator(BaseObjectColumnValueSelector 
selector, int size)
 
   private void initUnion()
   {
-    union = new SynchronizedUnion((Union) 
SetOperation.builder().setNominalEntries(size).build(Family.UNION));
+    union = (Union) 
SetOperation.builder().setNominalEntries(size).build(Family.UNION);
 
 Review comment:
   > It probably still makes sense to keep SynchronizedUnion class around
   
   Given the new API, it is impossible to make SynchronizedUnion a subclass of 
Union as it was before. But making it just a wrapper breaks a lot of other 
code, so it was way easier to get rid of it altogether.

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