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

Some times there are not output from requests.
{
    LOG_DEBUG(log, "Loading data parts");
    auto metadata_snapshot = getInMemoryMetadataPtr();
    const auto settings = getSettings();
    Strings part_file_names;
    auto disks = getStoragePolicy()->getDisks();
    
    if (!getStoragePolicy()->isDefaultPolicy() && !skip_sanity_checks)
    {
        
        std::unordered_set<String> defined_disk_names;
        
        std::unordered_set<String> disk_names_wrapped_in_cache;
        for (const auto & disk_ptr : disks)
            defined_disk_names.insert(disk_ptr->getName());
        for (const auto & [disk_name, disk_ptr] : getContext()->getDisksMap())
        {
            
            
            
            
            if (disk_ptr->supportsCache() && defined_disk_names.contains(disk_ptr->getName()))
            {
                auto caches = disk_ptr->getCacheLayersNames();