Method initialize

src/Statistics/AutoStatisticsManager.cpp:403–420

we have to ensure only

// we have to ensure only
void AutoStatisticsManager::initialize(ContextPtr context_, const Poco::Util::AbstractConfiguration & config)
{
    if (context_->getServerType() != ServerType::cnch_server)
        return;
    // use flush to create table if not exists
    context_->getAutoStatsTaskLog()->flush(true);

    // zk helper will make only one manager runs at the whole cluster
    if (AutoStatisticsManager::is_initialized)
        throw Exception("AutoStatisticsManager should call initialize only once", ErrorCodes::LOGICAL_ERROR);

    the_instance = std::make_unique<AutoStatisticsManager>(context_);
    the_instance->prepareNewConfig(config);

    LOG_INFO(the_instance->logger, "Create Thread Pool with Setting (1, 0, 1)");
    the_instance->thread_pool = std::make_unique<ThreadPool>(1, 0, 1);
    AutoStatisticsManager::is_initialized = true; // ready for instance
}

AutoStatisticsManager * AutoStatisticsManager::tryGetInstance()
{