Statistics
https://play.clickhouse.com/play?user=play#c2VsZWN0IAp0b1N0YXJ0T2ZIb3VyKGNoZWNrX3N0YXJ0X3RpbWUpIGFzIGQsCmNvdW50KCksICBncm91cFVuaXFBcnJheShwdWxsX3JlcXVlc3RfbnVtYmVyKSwgIGFueShyZXBvcnRfdXJsKQpmcm9tIGNoZWNrcyB3aGVyZSAnMjAyMi0wNi0wMScgPD0gY2hlY2tfc3RhcnRfdGltZSBhbmQgdGVzdF9uYW1lIGxpa2UgJyUwMjQ5MV9wYXJ0X2xvZ19oYXNfdGFibGVfdXVpZCUnIGFuZCB0ZXN0X3N0YXR1cyBpbiAoJ0ZBSUwnLCAnRkxBS1knKSBncm91cCBieSBkIG9yZGVyIGJ5IGQgZGVzYw==

Some times there are not output from requests.
}
        
        for (const auto & current_setting : current_changes)
        {
            const auto & setting_name = current_setting.name;
            const Field * new_value = new_changes.tryGet(setting_name);
            
            if (MergeTreeSettings::isReadonlySetting(setting_name) && !new_value)
            {
                throw Exception{"Setting '" + setting_name + "' is readonly for storage '" + getName() + "'",
                                ErrorCodes::READONLY_SETTING};
            }
            if (MergeTreeSettings::isPartFormatSetting(setting_name) && !new_value)
            {
                
                auto copy = getDefaultSettings();
                copy->applyChanges(new_changes);
                String reason;
                if (!canUsePolymorphicParts(*copy, &reason) && !reason.empty())
                    throw Exception("Can't change settings. Reason: " + reason, ErrorCodes::NOT_IMPLEMENTED);
            }
        }
    }
    for (const auto & part : getDataPartsVectorForInternalUsage())
    {
        bool at_least_one_column_rest = false;
        for (const auto & column : part->getColumns())
        {
            if (!dropped_columns.contains(column.name))
            {