**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`.

void loadSettingsFromConfig(const String & path, const Poco::Util::AbstractConfiguration & config);
    /// 
    void dumpToMapColumn(IColumn * column, bool changed_only = true);
    /// 
    /// 
    void addProgramOptions(boost::program_options::options_description & options);
    /// 
    /// 
    /// 
    void addProgramOptionsAsMultitokens(boost::program_options::options_description & options);
    /// 
    /// 
    static void checkNoSettingNamesAtTopLevel(const Poco::Util::AbstractConfiguration & config, const String & config_path);
    std::vector<String> getAllRegisteredNames() const override;
    void addProgramOption(boost::program_options::options_description & options, const SettingFieldRef & field);
    void addProgramOptionAsMultitoken(boost::program_options::options_description & options, const SettingFieldRef & field);
    void set(std::string_view name, const Field & value) override;
private:
    void applyCompatibilitySetting();
    std::unordered_set<std::string_view> settings_changed_by_compatibility_setting;
};
/*
 * User-specified file format settings for File and URL engines.
 */
DECLARE_SETTINGS_TRAITS(FormatFactorySettingsTraits, FORMAT_FACTORY_SETTINGS)
struct FormatFactorySettings : public BaseSettings<FormatFactorySettingsTraits>
{
};
}