himanshug 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_r224872813
 
 

 ##########
 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:
   you're right , Now I notice that updateUnion(..) is also called from 
synchronized block. nvmnd.

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