code: func DatumsToStrNoErr(datums []Datum) string {
  	str, err := DatumsToString(datums, true)
  	terror.Log(errors.Trace(err))
  	return str
  }
docs: // DatumsToStrNoErr converts some datums to a formatted string.
  // If an error occurs, it will print a log instead of returning an error.