Beispiel #1
0
// ComputeMinus computes the result of a-b.
func ComputeMinus(a, b Datum) (d Datum, err error) {
	switch a.Kind() {
	case KindInt64:
		switch b.Kind() {
		case KindInt64:
			r, err1 := SubInt64(a.GetInt64(), b.GetInt64())
			d.SetInt64(r)
			return d, errors.Trace(err1)
		case KindUint64:
			r, err1 := SubIntWithUint(a.GetInt64(), b.GetUint64())
			d.SetUint64(r)
			return d, errors.Trace(err1)
		}
	case KindUint64:
		switch b.Kind() {
		case KindInt64:
			r, err1 := SubUintWithInt(a.GetUint64(), b.GetInt64())
			d.SetUint64(r)
			return d, errors.Trace(err1)
		case KindUint64:
			r, err1 := SubUint64(a.GetUint64(), b.GetUint64())
			d.SetUint64(r)
			return d, errors.Trace(err1)
		}
	case KindFloat64:
		switch b.Kind() {
		case KindFloat64:
			r := a.GetFloat64() - b.GetFloat64()
			d.SetFloat64(r)
			return d, nil
		}
	case KindMysqlDecimal:
		switch b.Kind() {
		case KindMysqlDecimal:
			r := new(mysql.MyDecimal)
			err = mysql.DecimalSub(a.GetMysqlDecimal(), b.GetMysqlDecimal(), r)
			d.SetMysqlDecimal(r)
			return d, err
		}
	}
	_, err = InvOp2(a.GetValue(), b.GetValue(), opcode.Minus)
	return d, errors.Trace(err)
}
Beispiel #2
0
func (e *Evaluator) unaryOperation(u *ast.UnaryOperationExpr) bool {
	defer func() {
		if er := recover(); er != nil {
			e.err = errors.Errorf("%v", er)
		}
	}()
	aDatum := u.V.GetDatum()
	if aDatum.IsNull() {
		u.SetNull()
		return true
	}
	switch op := u.Op; op {
	case opcode.Not:
		n, err := aDatum.ToBool()
		if err != nil {
			e.err = errors.Trace(err)
		} else if n == 0 {
			u.SetInt64(1)
		} else {
			u.SetInt64(0)
		}
	case opcode.BitNeg:
		// for bit operation, we will use int64 first, then return uint64
		n, err := aDatum.ToInt64()
		if err != nil {
			e.err = errors.Trace(err)
			return false
		}
		u.SetUint64(uint64(^n))
	case opcode.Plus:
		switch aDatum.Kind() {
		case types.KindInt64,
			types.KindUint64,
			types.KindFloat64,
			types.KindFloat32,
			types.KindMysqlDuration,
			types.KindMysqlTime,
			types.KindString,
			types.KindMysqlDecimal,
			types.KindBytes,
			types.KindMysqlHex,
			types.KindMysqlBit,
			types.KindMysqlEnum,
			types.KindMysqlSet:
			u.SetDatum(*aDatum)
		default:
			e.err = ErrInvalidOperation
			return false
		}
	case opcode.Minus:
		switch aDatum.Kind() {
		case types.KindInt64:
			u.SetInt64(-aDatum.GetInt64())
		case types.KindUint64:
			u.SetInt64(-int64(aDatum.GetUint64()))
		case types.KindFloat64:
			u.SetFloat64(-aDatum.GetFloat64())
		case types.KindFloat32:
			u.SetFloat32(-aDatum.GetFloat32())
		case types.KindMysqlDuration:
			var to = new(mysql.MyDecimal)
			var zero mysql.MyDecimal
			mysql.DecimalSub(&zero, aDatum.GetMysqlDuration().ToNumber(), to)
			u.SetMysqlDecimal(to)
		case types.KindMysqlTime:
			dec := aDatum.GetMysqlTime().ToNumber()
			var zero, to mysql.MyDecimal
			mysql.DecimalSub(&zero, dec, &to)
			u.SetMysqlDecimal(&to)
		case types.KindString, types.KindBytes:
			f, err := types.StrToFloat(aDatum.GetString())
			e.err = errors.Trace(err)
			u.SetFloat64(-f)
		case types.KindMysqlDecimal:
			dec := aDatum.GetMysqlDecimal()
			var zero, to mysql.MyDecimal
			mysql.DecimalSub(&zero, dec, &to)
			u.SetMysqlDecimal(&to)
		case types.KindMysqlHex:
			u.SetFloat64(-aDatum.GetMysqlHex().ToNumber())
		case types.KindMysqlBit:
			u.SetFloat64(-aDatum.GetMysqlBit().ToNumber())
		case types.KindMysqlEnum:
			u.SetFloat64(-aDatum.GetMysqlEnum().ToNumber())
		case types.KindMysqlSet:
			u.SetFloat64(-aDatum.GetMysqlSet().ToNumber())
		default:
			e.err = ErrInvalidOperation
			return false
		}
	default:
		e.err = ErrInvalidOperation
		return false
	}

	return true
}
Beispiel #3
0
func unaryOpFactory(op opcode.Op) BuiltinFunc {
	return func(args []types.Datum, _ context.Context) (d types.Datum, err error) {
		defer func() {
			if er := recover(); er != nil {
				err = errors.Errorf("%v", er)
			}
		}()
		aDatum := args[0]
		if aDatum.IsNull() {
			return
		}
		switch op {
		case opcode.Not:
			var n int64
			n, err = aDatum.ToBool()
			if err != nil {
				err = errors.Trace(err)
			} else if n == 0 {
				d.SetInt64(1)
			} else {
				d.SetInt64(0)
			}
		case opcode.BitNeg:
			var n int64
			// for bit operation, we will use int64 first, then return uint64
			n, err = aDatum.ToInt64()
			if err != nil {
				return d, errors.Trace(err)
			}
			d.SetUint64(uint64(^n))
		case opcode.Plus:
			switch aDatum.Kind() {
			case types.KindInt64,
				types.KindUint64,
				types.KindFloat64,
				types.KindFloat32,
				types.KindMysqlDuration,
				types.KindMysqlTime,
				types.KindString,
				types.KindMysqlDecimal,
				types.KindBytes,
				types.KindMysqlHex,
				types.KindMysqlBit,
				types.KindMysqlEnum,
				types.KindMysqlSet:
				d = aDatum
			default:
				return d, ErrInvalidOperation.Gen("Unsupported type %v for op.Plus", aDatum.Kind())
			}
		case opcode.Minus:
			switch aDatum.Kind() {
			case types.KindInt64:
				d.SetInt64(-aDatum.GetInt64())
			case types.KindUint64:
				d.SetInt64(-int64(aDatum.GetUint64()))
			case types.KindFloat64:
				d.SetFloat64(-aDatum.GetFloat64())
			case types.KindFloat32:
				d.SetFloat32(-aDatum.GetFloat32())
			case types.KindMysqlDuration:
				dec := new(mysql.MyDecimal)
				err = mysql.DecimalSub(new(mysql.MyDecimal), aDatum.GetMysqlDuration().ToNumber(), dec)
				d.SetMysqlDecimal(dec)
			case types.KindMysqlTime:
				dec := new(mysql.MyDecimal)
				err = mysql.DecimalSub(new(mysql.MyDecimal), aDatum.GetMysqlTime().ToNumber(), dec)
				d.SetMysqlDecimal(dec)
			case types.KindString, types.KindBytes:
				f, err1 := types.StrToFloat(aDatum.GetString())
				err = errors.Trace(err1)
				d.SetFloat64(-f)
			case types.KindMysqlDecimal:
				dec := new(mysql.MyDecimal)
				err = mysql.DecimalSub(new(mysql.MyDecimal), aDatum.GetMysqlDecimal(), dec)
				d.SetMysqlDecimal(dec)
			case types.KindMysqlHex:
				d.SetFloat64(-aDatum.GetMysqlHex().ToNumber())
			case types.KindMysqlBit:
				d.SetFloat64(-aDatum.GetMysqlBit().ToNumber())
			case types.KindMysqlEnum:
				d.SetFloat64(-aDatum.GetMysqlEnum().ToNumber())
			case types.KindMysqlSet:
				d.SetFloat64(-aDatum.GetMysqlSet().ToNumber())
			default:
				return d, ErrInvalidOperation.Gen("Unsupported type %v for op.Minus", aDatum.Kind())
			}
		default:
			return d, ErrInvalidOperation.Gen("Unsupported op %v for unary op", op)
		}
		return
	}
}