presto-main/src/main/java/io/prestosql/sql/planner/optimizations/ActualProperties.java/Global/coordinatorSingleStreamPartition
class Global:        public static Global coordinatorSingleStreamPartition()
        {
            return partitionedOn(
                    COORDINATOR_DISTRIBUTION,
                    ImmutableList.of(),
                    Optional.of(ImmutableList.of()));
        }