presto-resource-group-managers/src/main/java/io/prestosql/plugin/resourcegroups/db/DbSourceExactMatchSelector.java/DbSourceExactMatchSelector/toTemplate
class DbSourceExactMatchSelector:    private static ResourceGroupIdTemplate toTemplate(ResourceGroupId groupId)
    {
        ResourceGroupIdTemplate template = new ResourceGroupIdTemplate(groupId.toString());
        checkArgument(template.getVariableNames().isEmpty(), "Group ID contains variable references: %s", groupId);
        return template;
    }