leventov commented on a change in pull request #7595: Optimize overshadowed 
segments computation
URL: https://github.com/apache/incubator-druid/pull/7595#discussion_r288672814
 
 

 ##########
 File path: 
core/src/main/java/org/apache/druid/timeline/SegmentWithOvershadowedStatus.java
 ##########
 @@ -31,6 +32,12 @@
 public class SegmentWithOvershadowedStatus implements 
Comparable<SegmentWithOvershadowedStatus>
 {
   private final boolean overshadowed;
+  /**
+   * dataSegment is serialized "unwrapped", i.e. it's properties are included 
as properties of
+   * enclosing class. If in future, if {@Code SegmentWithOvershadowedStatus} 
were to extend {@link DataSegment},
+   * there will be no change in the serialized format.
+   */
+  @JsonUnwrapped
 
 Review comment:
   Can you please also ensure that the data is sent in smile format, not JSON, 
between Coordinator and Brokers?

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