code: func (s *SessionVars) GetExecuteArgumentsInfo() string {
  	if len(s.PreparedParams) == 0 {
  		return ""
  	}
  	args := make([]string, 0, len(s.PreparedParams))
  	for _, v := range s.PreparedParams {
  		if v.IsNull() {
  			args = append(args, "<nil>")
  		} else {
  			str, err := v.ToString()
  			if err != nil {
  				terror.Log(err)
  			}
  			args = append(args, str)
  		}
  	}
  	return fmt.Sprintf(" [arguments: %s]", strings.Join(args, ", "))
  }
docs: // GetExecuteArgumentsInfo gets the argument list as a string of execute statement.