presto-resource-group-managers/src/main/java/io/prestosql/plugin/resourcegroups/db/ResourceGroupSpecBuilder.java/ResourceGroupSpecBuilder/build
class ResourceGroupSpecBuilder:    public ResourceGroupSpec build()
    {
        return new ResourceGroupSpec(
                nameTemplate,
                softMemoryLimit,
                maxQueued,
                softConcurrencyLimit,
                Optional.of(hardConcurrencyLimit),
                Optional.empty(),
                schedulingPolicy,
                schedulingWeight,
                Optional.of(subGroups.build()),
                jmxExport,
                softCpuLimit,
                hardCpuLimit);
    }