presto-main/src/main/java/io/prestosql/sql/planner/LocalExecutionPlanner.java/LocalExecutionPlanner/Visitor
class LocalExecutionPlanner:        private Visitor(Session session, StageExecutionDescriptor stageExecutionDescriptor)
        {
            this.session = session;
            this.stageExecutionDescriptor = stageExecutionDescriptor;
        }