lancelly commented on code in PR #14148:
URL: https://github.com/apache/iotdb/pull/14148#discussion_r1862857899


##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/ExpressionExtractor.java:
##########
@@ -73,13 +75,12 @@ public Void visitPlan(PlanNode node, Void context) {
       return null;
     }
 
-    /*@Override
-    public Void visitGroupReference(GroupReference node, Void context)
-    {
-        return lookup.resolve(node).accept(this, context);
+    @Override
+    public Void visitGroupReference(GroupReference node, Void context) {
+      return lookup.resolve(node).accept(this, context);
     }
 
-    @Override
+    /*@Override

Review Comment:
   visitAggregation is not removed, its already been commented out previously. 
For now, ExpressionExtractor is used by SymbolExtractor to extractor symbols 
for optimizing phase.
   



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