func (e *Evaluator) funcDateArith(v *ast.FuncDateArithExpr) bool {
// health check for date and interval
nodeDate := v.Date.GetValue()
if types.IsNil(nodeDate) {
v.SetValue(nil)
return true
}
nodeInterval := v.Interval.GetValue()
if types.IsNil(nodeInterval) {
v.SetValue(nil)
return true
}
// parse date
fieldType := mysql.TypeDate
var resultField *types.FieldType
switch x := nodeDate.(type) {
case mysql.Time:
if (x.Type == mysql.TypeDatetime) || (x.Type == mysql.TypeTimestamp) {
fieldType = mysql.TypeDatetime
}
case string:
if !mysql.IsDateFormat(x) {
fieldType = mysql.TypeDatetime
}
case int64:
if t, err := mysql.ParseTimeFromInt64(x); err == nil {
if (t.Type == mysql.TypeDatetime) || (t.Type == mysql.TypeTimestamp) {
fieldType = mysql.TypeDatetime
}
}
}
if mysql.IsClockUnit(v.Unit) {
fieldType = mysql.TypeDatetime
}
resultField = types.NewFieldType(fieldType)
resultField.Decimal = mysql.MaxFsp
value, err := types.Convert(nodeDate, resultField)
if err != nil {
e.err = ErrInvalidOperation.Gen("DateArith invalid args, need date but get %T", nodeDate)
return false
}
if types.IsNil(value) {
e.err = ErrInvalidOperation.Gen("DateArith invalid args, need date but get %v", value)
return false
}
result, ok := value.(mysql.Time)
if !ok {
e.err = ErrInvalidOperation.Gen("DateArith need time type, but got %T", value)
return false
}
// parse interval
var interval string
if strings.ToLower(v.Unit) == "day" {
day, err2 := parseDayInterval(nodeInterval)
if err2 != nil {
e.err = ErrInvalidOperation.Gen("DateArith invalid day interval, need int but got %T", nodeInterval)
return false
}
interval = fmt.Sprintf("%d", day)
} else {
interval = fmt.Sprintf("%v", nodeInterval)
}
year, month, day, duration, err := mysql.ExtractTimeValue(v.Unit, interval)
if err != nil {
e.err = errors.Trace(err)
return false
}
if v.Op == ast.DateSub {
year, month, day, duration = -year, -month, -day, -duration
}
result.Time = result.Time.Add(duration)
result.Time = result.Time.AddDate(int(year), int(month), int(day))
if result.Time.Nanosecond() == 0 {
result.Fsp = 0
}
v.SetValue(result)
return true
}
func builtinDateArith(args []types.Datum, ctx context.Context) (d types.Datum, err error) {
// Op is used for distinguishing date_add and date_sub.
// args[0] -> Op
// args[1] -> Date
// args[2] -> DateArithInterval
// health check for date and interval
if args[1].Kind() == types.KindNull {
d.SetNull()
return d, nil
}
nodeDate := args[1]
nodeInterval := args[2].GetInterface().(ast.DateArithInterval)
nodeIntervalIntervalDatum := nodeInterval.Interval.GetDatum()
if nodeIntervalIntervalDatum.Kind() == types.KindNull {
d.SetNull()
return d, nil
}
// parse date
fieldType := mysql.TypeDate
var resultField *types.FieldType
switch nodeDate.Kind() {
case types.KindMysqlTime:
x := nodeDate.GetMysqlTime()
if (x.Type == mysql.TypeDatetime) || (x.Type == mysql.TypeTimestamp) {
fieldType = mysql.TypeDatetime
}
case types.KindString:
x := nodeDate.GetString()
if !mysql.IsDateFormat(x) {
fieldType = mysql.TypeDatetime
}
case types.KindInt64:
x := nodeDate.GetInt64()
if t, err1 := mysql.ParseTimeFromInt64(x); err1 == nil {
if (t.Type == mysql.TypeDatetime) || (t.Type == mysql.TypeTimestamp) {
fieldType = mysql.TypeDatetime
}
}
}
if mysql.IsClockUnit(nodeInterval.Unit) {
fieldType = mysql.TypeDatetime
}
resultField = types.NewFieldType(fieldType)
resultField.Decimal = mysql.MaxFsp
value, err := nodeDate.ConvertTo(resultField)
if err != nil {
d.SetNull()
return d, ErrInvalidOperation.Gen("DateArith invalid args, need date but get %T", nodeDate)
}
if value.Kind() == types.KindNull {
d.SetNull()
return d, ErrInvalidOperation.Gen("DateArith invalid args, need date but get %v", value.GetValue())
}
if value.Kind() != types.KindMysqlTime {
d.SetNull()
return d, ErrInvalidOperation.Gen("DateArith need time type, but got %T", value.GetValue())
}
result := value.GetMysqlTime()
// parse interval
var interval string
if strings.ToLower(nodeInterval.Unit) == "day" {
day, err1 := parseDayInterval(*nodeIntervalIntervalDatum)
if err1 != nil {
d.SetNull()
return d, ErrInvalidOperation.Gen("DateArith invalid day interval, need int but got %T", nodeIntervalIntervalDatum.GetString())
}
interval = fmt.Sprintf("%d", day)
} else {
if nodeIntervalIntervalDatum.Kind() == types.KindString {
interval = fmt.Sprintf("%v", nodeIntervalIntervalDatum.GetString())
} else {
ii, err1 := nodeIntervalIntervalDatum.ToInt64()
if err1 != nil {
d.SetNull()
return d, errors.Trace(err1)
}
interval = fmt.Sprintf("%v", ii)
}
}
year, month, day, duration, err := mysql.ExtractTimeValue(nodeInterval.Unit, interval)
if err != nil {
d.SetNull()
return d, errors.Trace(err)
}
op := args[0].GetInterface().(ast.DateArithType)
if op == ast.DateSub {
year, month, day, duration = -year, -month, -day, -duration
}
result.Time = result.Time.Add(duration)
result.Time = result.Time.AddDate(int(year), int(month), int(day))
if result.Time.Nanosecond() == 0 {
result.Fsp = 0
}
d.SetMysqlTime(result)
return d, nil
}