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'。
distributed_settings.monitor_batch_inserts = context->getSettingsRef().distributed_directory_monitor_batch_inserts;
        if (!distributed_settings.monitor_split_batch_on_failure.changed)
            distributed_settings.monitor_split_batch_on_failure = context->getSettingsRef().distributed_directory_monitor_split_batch_on_failure;
        if (!distributed_settings.monitor_sleep_time_ms.changed)
            distributed_settings.monitor_sleep_time_ms = Poco::Timespan(context->getSettingsRef().distributed_directory_monitor_sleep_time_ms);
        if (!distributed_settings.monitor_max_sleep_time_ms.changed)
            distributed_settings.monitor_max_sleep_time_ms = Poco::Timespan(context->getSettingsRef().distributed_directory_monitor_max_sleep_time_ms);
        return StorageDistributed::create(
            args.table_id,
            args.columns,
            args.constraints,
            args.comment,
            remote_database,
            remote_table,
            cluster_name,
            context,
            sharding_key,
            storage_policy,
            args.relative_data_path,
            distributed_settings,
            args.attach);
    },
    {
        .supports_settings = true,
        .supports_parallel_insert = true,
        .source_access_type = AccessType::REMOTE,
    });
}
}