**Use case**

If FixedString is used with more than 256 bytes in size, it is suspicious and most likely indicates misusage.
Forbid this by default and add a setting to override it; ATTACH queries should allow creating tables nevertheless.

See also: `allow_suspicious_low_cardinality_types`.

|| create.storage->engine->name == "MaterializedPostgreSQL")
    {
        if (create.attach && create.uuid == UUIDHelpers::Nil)
            throw Exception(ErrorCodes::INCORRECT_QUERY, "UUID must be specified for ATTACH. "
                            "If you want to attach existing database, use just ATTACH DATABASE {};", create.getDatabase());
        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"
        || create.storage->engine->name == "MaterializedMySQL")
    {
        
        
        
        
        bool attach_from_user = create.attach && !internal && !create.attach_short_syntax;
        bool create_from_user = !create.attach;
        if (create_from_user)
        {
            if (create.uuid == UUIDHelpers::Nil)
                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 "