code: func IntergerUnsignedUpperBound(intType byte) uint64 {
  	switch intType {
  	case mysql.TypeTiny:
  		return math.MaxUint8
  	case mysql.TypeShort:
  		return math.MaxUint16
  	case mysql.TypeInt24:
  		return mysql.MaxUint24
  	case mysql.TypeLong:
  		return math.MaxUint32
  	case mysql.TypeLonglong:
  		return math.MaxUint64
  	case mysql.TypeBit:
  		return math.MaxUint64
  	case mysql.TypeEnum:
  		return math.MaxUint64
  	case mysql.TypeSet:
  		return math.MaxUint64
  	default:
  		panic("Input byte is not a mysql type")
  	}
  }
docs: // IntergerUnsignedUpperBound indicates the max uint64 values of different mysql types.