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'。
}
            syntax_result = TreeRewriter(local_context).analyze(required_columns_expr_list, storage_columns.getAllPhysical(),
                                                                storage, storage_metadata_snapshot);
            auto alias_actions = ExpressionAnalyzer(required_columns_expr_list, syntax_result, local_context).getActionsDAG(true);
            required_columns = alias_actions->getRequiredColumns().getNames();
        }
        auto source_pipe = createSources(
            storage_metadata_snapshot,
            query_info,
            processed_stage,
            max_block_size,
            header,
            aliases,
            table,
            required_columns.empty() ? real_column_names : required_columns,
            modified_context,
            current_streams,
            has_database_virtual_column,
            has_table_virtual_column);
        pipes.emplace_back(std::move(source_pipe));
    }
    auto pipe = Pipe::unitePipes(std::move(pipes));
    if (!pipe.empty() && !query_info.input_order_info)
        
        
        
        narrowPipe(pipe, num_streams);
    return pipe;
}
Pipe StorageMerge::createSources(