presto-main/src/main/java/io/prestosql/execution/scheduler/AllAtOnceExecutionPolicy.java/AllAtOnceExecutionPolicy/createExecutionSchedule
class AllAtOnceExecutionPolicy:    @Override
    public ExecutionSchedule createExecutionSchedule(Collection<SqlStageExecution> stages)
    {
        return new AllAtOnceExecutionSchedule(stages);
    }