yashmayya commented on code in PR #15135:
URL: https://github.com/apache/pinot/pull/15135#discussion_r1973511054


##########
pinot-query-planner/src/main/java/org/apache/pinot/query/planner/physical/DispatchablePlanContext.java:
##########
@@ -130,14 +134,26 @@ public List<DispatchablePlanFragment> 
constructDispatchablePlanFragmentList(Plan
         
dispatchablePlanFragment.setTimeBoundaryInfo(dispatchablePlanMetadata.getTimeBoundaryInfo());
       }
     }
-    return Arrays.asList(dispatchablePlanFragmentArray);
+    return dispatchablePlanFragmentMap;
   }
 
-  private void createDispatchablePlanFragmentList(DispatchablePlanFragment[] 
dispatchablePlanFragmentArray,
-      PlanFragment planFragmentRoot) {
-    dispatchablePlanFragmentArray[planFragmentRoot.getFragmentId()] = new 
DispatchablePlanFragment(planFragmentRoot);
-    for (PlanFragment childPlanFragment : planFragmentRoot.getChildren()) {
-      createDispatchablePlanFragmentList(dispatchablePlanFragmentArray, 
childPlanFragment);
+  private Map<Integer, DispatchablePlanFragment> 
createDispatchablePlanFragmentMap(PlanFragment planFragmentRoot) {
+    HashMap<Integer, DispatchablePlanFragment> result =
+        Maps.newHashMapWithExpectedSize(_dispatchablePlanMetadataMap.size());
+    Queue<PlanFragment> pendingPlanFragmentIds = new ArrayDeque<>();
+    pendingPlanFragmentIds.add(planFragmentRoot);
+    while (!pendingPlanFragmentIds.isEmpty()) {
+      PlanFragment planFragment = pendingPlanFragmentIds.poll();
+      int planFragmentId = planFragment.getFragmentId();
+
+      if (result.containsKey(planFragmentId)) {
+        LOGGER.info("plan fragment {} found twice", planFragmentId);
+        continue;
+      }

Review Comment:
   Ah, my bad, that totally makes sense 🤦‍♂️ 



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