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'。
extern const Event DistributedRejectedInserts;
    extern const Event DistributedDelayedInserts;
    extern const Event DistributedDelayedInsertsMilliseconds;
}
namespace DB
{
namespace ErrorCodes
{
    extern const int LOGICAL_ERROR;
    extern const int NOT_IMPLEMENTED;
    extern const int STORAGE_REQUIRES_PARAMETER;
    extern const int BAD_ARGUMENTS;
    extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
    extern const int INCORRECT_NUMBER_OF_COLUMNS;
    extern const int INFINITE_LOOP;
    extern const int TYPE_MISMATCH;
    extern const int TOO_MANY_ROWS;
    extern const int UNABLE_TO_SKIP_UNUSED_SHARDS;
    extern const int INVALID_SHARD_ID;
    extern const int ALTER_OF_COLUMN_IS_FORBIDDEN;
    extern const int DISTRIBUTED_TOO_MANY_PENDING_BYTES;
    extern const int ARGUMENT_OUT_OF_BOUND;
}
namespace ActionLocks
{
    extern const StorageActionBlockType DistributedSend;
}
namespace
{
ASTPtr rewriteSelectQuery(const ASTPtr & query, const std::string & database, const std::string & table, ASTPtr table_function_ptr = nullptr)