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'。
{
    Strings paths;
    if (relative_data_path.empty())
        return paths;
    for (const DiskPtr & disk : data_volume->getDisks())
        paths.push_back(disk->getPath() + relative_data_path);
    return paths;
}
void StorageDistributed::truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder &)
{
    std::lock_guard lock(cluster_nodes_mutex);
    LOG_DEBUG(log, "Removing pending blocks for async INSERT from filesystem on TRUNCATE TABLE");
    for (auto it = cluster_nodes_data.begin(); it != cluster_nodes_data.end();)
    {
        it->second.directory_monitor->shutdownAndDropAllData();
        it = cluster_nodes_data.erase(it);
    }
    LOG_DEBUG(log, "Removed");
}
StoragePolicyPtr StorageDistributed::getStoragePolicy() const
{
    return storage_policy;
}
void StorageDistributed::createDirectoryMonitors(const DiskPtr & disk)