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'。
StreamLocalLimits limits;
            SizeLimits leaf_limits;
            
            auto adding_limits_and_quota = std::make_unique<SettingQuotaAndLimitsStep>(
                    query_plan.getCurrentDataStream(),
                    destination,
                    std::move(destination_lock),
                    limits,
                    leaf_limits,
                    nullptr,
                    nullptr);
            adding_limits_and_quota->setStepDescription("Lock destination table for Buffer");
            query_plan.addStep(std::move(adding_limits_and_quota));
        }
    }
    Pipe pipe_from_buffers;
    {
        Pipes pipes_from_buffers;
        pipes_from_buffers.reserve(num_shards);
        for (auto & buf : buffers)
            pipes_from_buffers.emplace_back(std::make_shared<BufferSource>(column_names, buf, *this, metadata_snapshot));
        pipe_from_buffers = Pipe::unitePipes(std::move(pipes_from_buffers));
    }
    if (pipe_from_buffers.empty())
        return;
    QueryPlan buffers_plan;
    /** If the sources from the table were processed before some non-initial stage of query execution,
      * then sources from the buffers must also be wrapped in the processing pipeline before the same stage.
      */
    if (processed_stage > QueryProcessingStage::FetchColumns)