This issue happens on production of one user that enabled Sentry:

![Screenshot_20210303_002028](https://user-images.githubusercontent.com/18581488/109716945-7f9a1200-7bb6-11eb-8cf4-1080ad535d18.png)

Build id: 49938CCB63EE2A4E16CF0528307EE15F08469219.
"If you want to attach existing database, use just ATTACH DATABASE {};", create.database);
        else if (create.uuid == UUIDHelpers::Nil)
            create.uuid = UUIDHelpers::generateV4();
        metadata_path = metadata_path / "store" / DatabaseCatalog::getPathForUUID(create.uuid);
        if (!create.attach && fs::exists(metadata_path))
            throw Exception(ErrorCodes::DATABASE_ALREADY_EXISTS, "Metadata directory {} already exists", metadata_path.string());
    }
    else if (create.storage->engine->name == "MaterializeMySQL")
    {
        
        
        
        
        bool attach_from_user = create.attach && !internal && !create.attach_short_syntax;
        bool create_from_user = !create.attach;
        if (create_from_user)
        {
            const auto & default_engine = context.getSettingsRef().default_database_engine.value;
            if (create.uuid == UUIDHelpers::Nil && default_engine == DefaultDatabaseEngine::Atomic)
                create.uuid = UUIDHelpers::generateV4();    
        }
        else if (attach_from_user && create.uuid == UUIDHelpers::Nil)
        {
            
            
            throw Exception("Use short attach syntax ('ATTACH DATABASE name;' without engine) to attach existing database "
                            "or specify UUID to attach new database with Atomic engine", ErrorCodes::INCORRECT_QUERY);
        }
        
        if (create.uuid == UUIDHelpers::Nil)