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 StorageBufferFlush;
    extern const Event StorageBufferErrorOnFlush;
    extern const Event StorageBufferPassedAllMinThresholds;
    extern const Event StorageBufferPassedTimeMaxThreshold;
    extern const Event StorageBufferPassedRowsMaxThreshold;
    extern const Event StorageBufferPassedBytesMaxThreshold;
    extern const Event StorageBufferPassedTimeFlushThreshold;
    extern const Event StorageBufferPassedRowsFlushThreshold;
    extern const Event StorageBufferPassedBytesFlushThreshold;
    extern const Event StorageBufferLayerLockReadersWaitMilliseconds;
    extern const Event StorageBufferLayerLockWritersWaitMilliseconds;
}
namespace CurrentMetrics
{
    extern const Metric StorageBufferRows;
    extern const Metric StorageBufferBytes;
}
namespace DB
{
namespace ErrorCodes
{
    extern const int BAD_ARGUMENTS;
    extern const int NOT_IMPLEMENTED;
    extern const int LOGICAL_ERROR;
    extern const int INFINITE_LOOP;
    extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
    extern const int ALTER_OF_COLUMN_IS_FORBIDDEN;
}
std::unique_lock<std::mutex> StorageBuffer::Buffer::lockForReading() const