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

Some times there are not output from requests.
{
    IStorage::renameInMemory(new_table_id);
    std::atomic_store(&log_name, std::make_shared<String>(new_table_id.getNameForLogs()));
    log = &Poco::Logger::get(*log_name);
}
void MergeTreeData::dropAllData()
{
    LOG_TRACE(log, "dropAllData: waiting for locks.");
    auto settings_ptr = getSettings();
    auto lock = lockParts();
    DataPartsVector all_parts;
    for (auto it = data_parts_by_info.begin(); it != data_parts_by_info.end(); ++it)
    {
        modifyPartState(it, DataPartState::Deleting);
        all_parts.push_back(*it);
    }
    {
        std::lock_guard wal_lock(write_ahead_log_mutex);
        if (write_ahead_log)
            write_ahead_log->shutdown();
    }
    
    
    if (!getStorageID().hasUUID())
        getContext()->dropCaches();
    
    NameSet part_names_failed;
    try
    {
        LOG_TRACE(log, "dropAllData: removing data parts (count {}) from filesystem.", all_parts.size());