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 StorageID & table_id_,
    const ColumnsDescription & columns_,
    const String & comment,
    const String & source_database_name_or_regexp_,
    bool database_is_regexp_,
    const String & source_table_regexp_,
    ContextPtr context_)
    : IStorage(table_id_)
    , WithContext(context_->getGlobalContext())
    , source_database_regexp(source_database_name_or_regexp_)
    , source_table_regexp(source_table_regexp_)
    , source_database_name_or_regexp(source_database_name_or_regexp_)
    , database_is_regexp(database_is_regexp_)
{
    StorageInMemoryMetadata storage_metadata;
    storage_metadata.setColumns(columns_);
    storage_metadata.setComment(comment);
    setInMemoryMetadata(storage_metadata);
}
template <typename F>
StoragePtr StorageMerge::getFirstTable(F && predicate) const