yashmayya commented on code in PR #13166:
URL: https://github.com/apache/pinot/pull/13166#discussion_r1602966396


##########
pinot-query-planner/src/main/java/org/apache/pinot/query/planner/plannode/SetOpNode.java:
##########
@@ -57,7 +57,7 @@ public boolean isAll() {
 
   @Override
   public String explain() {
-    return _setOpType.toString();
+    return _all ? _setOpType.toString() + "_ALL" : _setOpType.toString();

Review Comment:
   Ah, I just noticed that the query plan for `UNION` contains an aggregation 
on top to only get unique values from the result of the `UNION ALL`, 
interesting.



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