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'。
cluster_name_,
        context_,
        sharding_key_,
        storage_policy_name_,
        relative_data_path_,
        distributed_settings_,
        attach,
        std::move(owned_cluster_),
        remote_table_function_ptr_)
{
}
QueryProcessingStage::Enum StorageDistributed::getQueryProcessingStage(
    ContextPtr local_context,
    QueryProcessingStage::Enum to_stage,
    const StorageMetadataPtr & metadata_snapshot,
    SelectQueryInfo & query_info) const
{
    const auto & settings = local_context->getSettingsRef();
    ClusterPtr cluster = getCluster();
    query_info.cluster = cluster;
    size_t nodes = getClusterQueriedNodes(settings, cluster);
    
    
    if (nodes > 1 && settings.optimize_skip_unused_shards)
    {
        ClusterPtr optimized_cluster = getOptimizedCluster(local_context, metadata_snapshot, query_info.query);
        if (optimized_cluster)
        {
            LOG_DEBUG(log, "Skipping irrelevant shards - the query will be sent to the following shards of the cluster (shard numbers): {}",
                    makeFormattedListOfShards(optimized_cluster));