@Override
  public Operator visitTimeSeriesSchemaScan(
      TimeSeriesSchemaScanNode node, LocalExecutionPlanContext context) {
    OperatorContext operatorContext =
        context
            .getDriverContext()
            .addOperatorContext(
                context.getNextOperatorId(),
                node.getPlanNodeId(),
                SchemaQueryScanOperator.class.getSimpleName());
    return new SchemaQueryScanOperator<>(
        node.getPlanNodeId(),
        operatorContext,
        SchemaSourceFactory.getTimeSeriesSchemaScanSource(
            node.getPath(),
            node.isPrefixPath(),
            node.getLimit(),
            node.getOffset(),
            node.getSchemaFilter(),
            node.getTemplateMap(),
            node.getScope()));
  }
This Visitor is responsible for transferring PlanNode Tree to Operator Tree.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/OperatorTreeGenerator.java