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'。
const Block & header,
    const StorageMetadataPtr & metadata_snapshot,
    const Aliases & aliases,
    ContextPtr local_context,
    ASTPtr & query,
    Pipe & pipe,
    QueryProcessingStage::Enum processed_stage)
{
    Block before_block_header = pipe.getHeader();
    auto storage_sample_block = metadata_snapshot->getSampleBlock();
    auto pipe_columns = pipe.getHeader().getNamesAndTypesList();
    for (const auto & alias : aliases)
    {
        pipe_columns.emplace_back(NameAndTypePair(alias.name, alias.type));
        ASTPtr expr = std::move(alias.expression);
        auto syntax_result = TreeRewriter(local_context).analyze(expr, pipe_columns);
        auto expression_analyzer = ExpressionAnalyzer{alias.expression, syntax_result, local_context};
        auto dag = std::make_shared<ActionsDAG>(pipe_columns);
        auto actions_dag = expression_analyzer.getActionsDAG(true, false);
        auto actions = std::make_shared<ExpressionActions>(actions_dag, ExpressionActionsSettings::fromContext(local_context, CompileExpressions::yes));
        pipe.addSimpleTransform([&](const Block & stream_header)
        {
            return std::make_shared<ExpressionTransform>(stream_header, actions);
        });
    }
    {