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'。
{
        LOG_DEBUG(log,
            "Number of values for sharding key exceeds optimize_skip_unused_shards_limit={}, "
            "try to increase it, but note that this may increase query processing time.",
            local_context->getSettingsRef().optimize_skip_unused_shards_limit);
        return nullptr;
    }
    
    if (!blocks)
    {
        return nullptr;
    }
    std::set<int> shards;
    for (const auto & block : *blocks)
    {
        if (!block.has(sharding_key_column_name))
            throw Exception("sharding_key_expr should evaluate as a single row", ErrorCodes::TOO_MANY_ROWS);
        const ColumnWithTypeAndName & result = block.getByName(sharding_key_column_name);
        const auto selector = createSelector(cluster, result);
        shards.insert(selector.begin(), selector.end());
    }
    return cluster->getClusterWithMultipleShards({shards.begin(), shards.end()});
}
ActionLock StorageDistributed::getActionLock(StorageActionBlockType type)
{
    if (type == ActionLocks::DistributedSend)
        return monitors_blocker.cancel();
    return {};
}
void StorageDistributed::flush()