presto-resource-group-managers/src/main/java/io/prestosql/plugin/resourcegroups/ResourceGroupIdTemplate.java/ResourceGroupIdTemplate/forSubGroupNamed
class ResourceGroupIdTemplate:    public static ResourceGroupIdTemplate forSubGroupNamed(ResourceGroupIdTemplate parent, String name)
    {
        return new ResourceGroupIdTemplate(format("%s.%s", requireNonNull(parent, "parent is null"), requireNonNull(name, "name is null")));
    }