private Operator constructTreeToTableViewAdaptorOperator(DeviceEntry deviceEntry) {
            seriesScanOperators = new ArrayList<>(measurementSchemas.size());
            operator = constructAndJoinScanOperators(deviceEntry);
            return new TreeToTableViewAdaptorOperator(
                operatorContext,
                deviceEntry,
                columnsIndexArray,
                fullColumnSchemas,
                operator,
                extractor);
          }
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