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'。
StorageBuffer::Buffer * least_busy_buffer = nullptr;
        std::unique_lock<std::mutex> least_busy_lock;
        size_t least_busy_shard_rows = 0;
        for (size_t try_no = 0; try_no < storage.num_shards; ++try_no)
        {
            std::unique_lock lock(storage.buffers[shard_num].tryLock());
            if (lock.owns_lock())
            {
                size_t num_rows = storage.buffers[shard_num].data.rows();
                if (!least_busy_buffer || num_rows < least_busy_shard_rows)
                {
                    least_busy_buffer = &storage.buffers[shard_num];
                    least_busy_lock = std::move(lock);
                    least_busy_shard_rows = num_rows;
                }
            }
            shard_num = (shard_num + 1) % storage.num_shards;
        }
        
        if (!least_busy_buffer)
        {
            least_busy_buffer = &storage.buffers[start_shard_num];
            least_busy_lock = least_busy_buffer->lockForWriting();
        }
        insertIntoBuffer(block, *least_busy_buffer);
        least_busy_lock.unlock();
        storage.reschedule();
    }
private:
    StorageBuffer & storage;