presto-main/src/main/java/io/prestosql/operator/ExplainAnalyzeOperator.java/ExplainAnalyzeOperator/createOperator
class ExplainAnalyzeOperator:        @Override
        public Operator createOperator(DriverContext driverContext)
        {
            checkState(!closed, "Factory is already closed");
            OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, ExplainAnalyzeOperator.class.getSimpleName());
            return new ExplainAnalyzeOperator(operatorContext, queryPerformanceFetcher, metadata, verbose);
        }