private Operator getReuseOffsetOperator(Operator child) {
            this.reuseOffsetOperator =
                reuseOffsetOperator == null
                    ? new OffsetOperator(operatorContext, node.getPushDownOffset(), child)
                    : new OffsetOperator(reuseOffsetOperator, child);
            return this.reuseOffsetOperator;
          }
This Visitor is responsible for transferring Table PlanNode Tree to Table Operator Tree.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/TableOperatorGenerator.java