ref #9436
Currently EPHEMERAL column requires an explicit default value provided on CREATE TABLE - we can allow implicit default there

backQuoteIfNeed(database_name), backQuoteIfNeed(create.getTable()));
        if (create.is_dictionary && !create_query.is_dictionary)
            throw Exception(ErrorCodes::INCORRECT_QUERY,
                "Cannot ATTACH DICTIONARY {}.{}, it is a Table",
                backQuoteIfNeed(database_name), backQuoteIfNeed(create.getTable()));
        create = create_query; 
        create.attach = true;
        create.attach_short_syntax = true;
        create.if_not_exists = if_not_exists;
    }
    
    if (create.attach_from_path)
    {
        fs::path user_files = fs::path(getContext()->getUserFilesPath()).lexically_normal();
        fs::path root_path = fs::path(getContext()->getPath()).lexically_normal();
        if (getContext()->getClientInfo().query_kind == ClientInfo::QueryKind::INITIAL_QUERY)
        {
            fs::path data_path = fs::path(*create.attach_from_path).lexically_normal();
            if (data_path.is_relative())
                data_path = (user_files / data_path).lexically_normal();
            if (!startsWith(data_path, user_files))
                throw Exception(ErrorCodes::PATH_ACCESS_DENIED,
                                "Data directory {} must be inside {} to attach it", String(data_path), String(user_files));
            
            create.attach_from_path = fs::relative(data_path, root_path) / "";
        }
        else
        {
            fs::path data_path = (root_path / *create.attach_from_path).lexically_normal();
            if (!startsWith(data_path, user_files))