Change the table comment after created the table is not supported now?
Like mysql : ALTER TABLE [tableName] COMMNET [comment]; 
The sql "ALTER TABLE `system`.tables UPDATE Comment='test' WHERE NAME='t1';" also not supported!!!
My version is '21.9.4.35'。
}
void StorageDistributed::shutdown()
{
    monitors_blocker.cancelForever();
    std::lock_guard lock(cluster_nodes_mutex);
    LOG_DEBUG(log, "Joining background threads for async INSERT");
    cluster_nodes_data.clear();
    LOG_DEBUG(log, "Background threads for async INSERT joined");
}
void StorageDistributed::drop()
{
    
    
    
    
    
    
    
    
    shutdown();
    
    if (relative_data_path.empty())
        return;
    LOG_DEBUG(log, "Removing pending blocks for async INSERT from filesystem on DROP TABLE");
    auto disks = data_volume->getDisks();
    for (const auto & disk : disks)
        disk->removeRecursive(relative_data_path);
    LOG_DEBUG(log, "Removed");
}
Strings StorageDistributed::getDataPaths() const