func (d *Datum) compareMysqlDuration(dur mysql.Duration) (int, error) {
switch d.k {
case KindMysqlDuration:
return d.GetMysqlDuration().Compare(dur), nil
case KindString, KindBytes:
dDur, err := mysql.ParseDuration(d.GetString(), mysql.MaxFsp)
return dDur.Compare(dur), err
default:
return d.compareFloat64(dur.Seconds())
}
}
