示例#1
0
文件: binop.go 项目: nengwang/tidb
func (o *BinaryOperation) evalMinus(a interface{}, b interface{}) (interface{}, error) {
	switch x := a.(type) {
	case int64:
		switch y := b.(type) {
		case int64:
			return types.SubInt64(x, y)
		case uint64:
			return types.SubIntWithUint(x, y)
		}
	case uint64:
		switch y := b.(type) {
		case int64:
			return types.SubUintWithInt(x, y)
		case uint64:
			return types.SubUint64(x, y)
		}
	case float64:
		switch y := b.(type) {
		case float64:
			return x - y, nil
		}
	case mysql.Decimal:
		switch y := b.(type) {
		case mysql.Decimal:
			return x.Sub(y), nil
		}
	}

	return types.InvOp2(a, b, opcode.Minus)
}
示例#2
0
func computeMinus(a, b types.Datum) (d types.Datum, err error) {
	switch a.Kind() {
	case types.KindInt64:
		switch b.Kind() {
		case types.KindInt64:
			r, err1 := types.SubInt64(a.GetInt64(), b.GetInt64())
			d.SetInt64(r)
			return d, errors.Trace(err1)
		case types.KindUint64:
			r, err1 := types.SubIntWithUint(a.GetInt64(), b.GetUint64())
			d.SetUint64(r)
			return d, errors.Trace(err1)
		}
	case types.KindUint64:
		switch b.Kind() {
		case types.KindInt64:
			r, err1 := types.SubUintWithInt(a.GetUint64(), b.GetInt64())
			d.SetUint64(r)
			return d, errors.Trace(err1)
		case types.KindUint64:
			r, err1 := types.SubUint64(a.GetUint64(), b.GetUint64())
			d.SetUint64(r)
			return d, errors.Trace(err1)
		}
	case types.KindFloat64:
		switch b.Kind() {
		case types.KindFloat64:
			r := a.GetFloat64() - b.GetFloat64()
			d.SetFloat64(r)
			return d, nil
		}
	case types.KindMysqlDecimal:
		switch b.Kind() {
		case types.KindMysqlDecimal:
			r := a.GetMysqlDecimal().Sub(b.GetMysqlDecimal())
			d.SetMysqlDecimal(r)
			return d, nil
		}
	}
	_, err = types.InvOp2(a.GetValue(), b.GetValue(), opcode.Minus)
	return d, errors.Trace(err)
}