code: func IsTypeNumeric(tp byte) bool {
  	switch tp {
  	case mysql.TypeBit, mysql.TypeTiny, mysql.TypeInt24, mysql.TypeLong, mysql.TypeLonglong, mysql.TypeNewDecimal,
  		mysql.TypeDecimal, mysql.TypeFloat, mysql.TypeDouble, mysql.TypeShort:
  		return true
  	}
  	return false
  }
docs: // IsTypeNumeric returns a boolean indicating whether the tp is numeric type.