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(e.sc)
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(e.sc)
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(types.MyDecimal)
var zero types.MyDecimal
types.DecimalSub(&zero, aDatum.GetMysqlDuration().ToNumber(), to)
u.SetMysqlDecimal(to)
case types.KindMysqlTime:
dec := aDatum.GetMysqlTime().ToNumber()
var zero, to types.MyDecimal
types.DecimalSub(&zero, dec, &to)
u.SetMysqlDecimal(&to)
case types.KindString, types.KindBytes:
f, err := types.StrToFloat(e.sc, aDatum.GetString())
e.err = errors.Trace(err)
u.SetFloat64(-f)
case types.KindMysqlDecimal:
dec := aDatum.GetMysqlDecimal()
var zero, to types.MyDecimal
types.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
}
// See http://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_from-unixtime
func builtinFromUnixTime(args []types.Datum, ctx context.Context) (d types.Datum, err error) {
sc := ctx.GetSessionVars().StmtCtx
unixTimeStamp, err := args[0].ToDecimal(sc)
if err != nil {
return d, errors.Trace(err)
}
// 0 <= unixTimeStamp <= INT32_MAX
if unixTimeStamp.IsNegative() {
return
}
integralPart, err := unixTimeStamp.ToInt()
if err == types.ErrTruncated {
err = nil
}
if err != nil {
return d, errors.Trace(err)
}
if integralPart > int64(math.MaxInt32) {
return
}
// Split the integral part and fractional part of a decimal timestamp.
// e.g. for timestamp 12345.678,
// first get the integral part 12345,
// then (12345.678 - 12345) * (10^9) to get the decimal part and convert it to nanosecond precision.
integerDecimalTp := new(types.MyDecimal).FromInt(integralPart)
fracDecimalTp := new(types.MyDecimal)
err = types.DecimalSub(unixTimeStamp, integerDecimalTp, fracDecimalTp)
if err != nil {
return d, errors.Trace(err)
}
nano := new(types.MyDecimal).FromInt(int64(time.Second))
x := new(types.MyDecimal)
err = types.DecimalMul(fracDecimalTp, nano, x)
if err != nil {
return d, errors.Trace(err)
}
fractionalPart, err := x.ToInt() // here fractionalPart is result multiplying the original fractional part by 10^9.
if err == types.ErrTruncated {
err = nil
}
if err != nil {
return d, errors.Trace(err)
}
_, fracDigitsNumber := unixTimeStamp.PrecisionAndFrac()
fsp := fracDigitsNumber
if fracDigitsNumber > types.MaxFsp {
fsp = types.MaxFsp
}
tr, err := types.RoundFrac(time.Unix(integralPart, fractionalPart), fsp)
if err != nil {
return d, errors.Trace(err)
}
t := types.Time{
Time: types.FromGoTime(tr),
Type: mysql.TypeDatetime,
Fsp: fsp,
}
if args[0].Kind() == types.KindString { // Keep consistent with MySQL.
t.Fsp = types.MaxFsp
}
d.SetMysqlTime(t)
if len(args) == 1 {
return
}
return builtinDateFormat([]types.Datum{d, args[1]}, ctx)
}
