walterddr commented on code in PR #10748:
URL: https://github.com/apache/pinot/pull/10748#discussion_r1190225347


##########
pinot-query-planner/src/main/java/org/apache/pinot/query/planner/plannode/ExchangeNode.java:
##########
@@ -46,11 +47,14 @@ public class ExchangeNode extends AbstractPlanNode {
   @ProtoProperties
   private List<RelFieldCollation> _collations;
 
+  @ProtoProperties
+  private Set<String> _tableNames;
+
   public ExchangeNode(int planFragmentId) {
     super(planFragmentId);
   }
 
-  public ExchangeNode(int currentStageId, DataSchema dataSchema, 
RelDistribution distribution,
+  public ExchangeNode(int currentStageId, DataSchema dataSchema, Set<String> 
tableNames, RelDistribution distribution,

Review Comment:
   what is tableNames doing here? and can we add some comment on what this 
means?



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