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'。
const StorageID & id_,
    const ColumnsDescription & columns_,
    const ConstraintsDescription & constraints_,
    const String & comment,
    const String & remote_database_,
    const String & remote_table_,
    const String & cluster_name_,
    ContextPtr context_,
    const ASTPtr & sharding_key_,
    const String & storage_policy_name_,
    const String & relative_data_path_,
    const DistributedSettings & distributed_settings_,
    bool attach_,
    ClusterPtr owned_cluster_,
    ASTPtr remote_table_function_ptr_)
    : IStorage(id_)
    , WithContext(context_->getGlobalContext())
    , remote_database(remote_database_)
    , remote_table(remote_table_)
    , remote_table_function_ptr(remote_table_function_ptr_)
    , log(&Poco::Logger::get("StorageDistributed (" + id_.table_name + ")"))
    , owned_cluster(std::move(owned_cluster_))
    , cluster_name(getContext()->getMacros()->expand(cluster_name_))
    , has_sharding_key(sharding_key_)
    , relative_data_path(relative_data_path_)
    , distributed_settings(distributed_settings_)
    , rng(randomSeed())
{