@Override
          public boolean keepOffsetAndLimitOperatorAfterDeviceIterator() {
            calculateSeriesScanOptionsList();
            return !removeUpperOffsetAndLimitOperator && !node.isPushLimitToEachDevice();
          }
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