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builtin_arithmetic.go
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// Copyright 2017 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package expression
import (
"fmt"
"math"
"github.com/pingcap/tidb/pkg/parser/mysql"
"github.com/pingcap/tidb/pkg/parser/terror"
"github.com/pingcap/tidb/pkg/sessionctx"
"github.com/pingcap/tidb/pkg/types"
"github.com/pingcap/tidb/pkg/util/chunk"
"github.com/pingcap/tidb/pkg/util/mathutil"
"github.com/pingcap/tipb/go-tipb"
)
var (
_ functionClass = &arithmeticPlusFunctionClass{}
_ functionClass = &arithmeticMinusFunctionClass{}
_ functionClass = &arithmeticDivideFunctionClass{}
_ functionClass = &arithmeticMultiplyFunctionClass{}
_ functionClass = &arithmeticIntDivideFunctionClass{}
_ functionClass = &arithmeticModFunctionClass{}
)
var (
_ builtinFunc = &builtinArithmeticPlusRealSig{}
_ builtinFunc = &builtinArithmeticPlusDecimalSig{}
_ builtinFunc = &builtinArithmeticPlusIntSig{}
_ builtinFunc = &builtinArithmeticMinusRealSig{}
_ builtinFunc = &builtinArithmeticMinusDecimalSig{}
_ builtinFunc = &builtinArithmeticMinusIntSig{}
_ builtinFunc = &builtinArithmeticDivideRealSig{}
_ builtinFunc = &builtinArithmeticDivideDecimalSig{}
_ builtinFunc = &builtinArithmeticMultiplyRealSig{}
_ builtinFunc = &builtinArithmeticMultiplyDecimalSig{}
_ builtinFunc = &builtinArithmeticMultiplyIntUnsignedSig{}
_ builtinFunc = &builtinArithmeticMultiplyIntSig{}
_ builtinFunc = &builtinArithmeticIntDivideIntSig{}
_ builtinFunc = &builtinArithmeticIntDivideDecimalSig{}
_ builtinFunc = &builtinArithmeticModIntUnsignedUnsignedSig{}
_ builtinFunc = &builtinArithmeticModIntUnsignedSignedSig{}
_ builtinFunc = &builtinArithmeticModIntSignedUnsignedSig{}
_ builtinFunc = &builtinArithmeticModIntSignedSignedSig{}
_ builtinFunc = &builtinArithmeticModRealSig{}
_ builtinFunc = &builtinArithmeticModDecimalSig{}
)
// precIncrement indicates the number of digits by which to increase the scale of the result of division operations
// performed with the / operator.
const precIncrement = 4
// isConstantBinaryLiteral return true if expr is constant binary literal
func isConstantBinaryLiteral(expr Expression) bool {
if types.IsBinaryStr(expr.GetType()) {
if v, ok := expr.(*Constant); ok {
if k := v.Value.Kind(); k == types.KindBinaryLiteral {
return true
}
}
}
return false
}
// numericContextResultType returns types.EvalType for numeric function's parameters.
// the returned types.EvalType should be one of: types.ETInt, types.ETDecimal, types.ETReal
func numericContextResultType(expr Expression) types.EvalType {
ft := expr.GetType()
if types.IsTypeTemporal(ft.GetType()) {
if ft.GetDecimal() > 0 {
return types.ETDecimal
}
return types.ETInt
}
// to solve https://github.com/pingcap/tidb/issues/27698
// if expression is constant binary literal, like `0x1234`, `0b00011`, cast to integer
// for other binary str column related expression, like varbinary, cast to float/double.
if isConstantBinaryLiteral(expr) || ft.GetType() == mysql.TypeBit {
return types.ETInt
}
evalTp4Ft := types.ETReal
if !ft.Hybrid() {
evalTp4Ft = ft.EvalType()
if evalTp4Ft != types.ETDecimal && evalTp4Ft != types.ETInt {
evalTp4Ft = types.ETReal
}
}
return evalTp4Ft
}
// setFlenDecimal4RealOrDecimal is called to set proper `flen` and `decimal` of return
// type according to the two input parameter's types.
func setFlenDecimal4RealOrDecimal(ctx sessionctx.Context, retTp *types.FieldType, arg0, arg1 Expression, isReal bool, isMultiply bool) {
a, b := arg0.GetType(), arg1.GetType()
if a.GetDecimal() != types.UnspecifiedLength && b.GetDecimal() != types.UnspecifiedLength {
retTp.SetDecimalUnderLimit(a.GetDecimal() + b.GetDecimal())
if !isMultiply {
retTp.SetDecimalUnderLimit(mathutil.Max(a.GetDecimal(), b.GetDecimal()))
}
if !isReal && retTp.GetDecimal() > mysql.MaxDecimalScale {
retTp.SetDecimal(mysql.MaxDecimalScale)
}
if a.GetFlen() == types.UnspecifiedLength || b.GetFlen() == types.UnspecifiedLength {
retTp.SetFlen(types.UnspecifiedLength)
return
}
if isMultiply {
digitsInt := a.GetFlen() - a.GetDecimal() + b.GetFlen() - b.GetDecimal()
retTp.SetFlenUnderLimit(digitsInt + retTp.GetDecimal())
} else {
digitsInt := mathutil.Max(a.GetFlen()-a.GetDecimal(), b.GetFlen()-b.GetDecimal())
retTp.SetFlenUnderLimit(digitsInt + retTp.GetDecimal() + 1)
}
if isReal {
retTp.SetFlen(mathutil.Min(retTp.GetFlen(), mysql.MaxRealWidth))
return
}
retTp.SetFlenUnderLimit(mathutil.Min(retTp.GetFlen(), mysql.MaxDecimalWidth))
return
}
if isReal {
retTp.SetFlen(types.UnspecifiedLength)
retTp.SetDecimal(types.UnspecifiedLength)
} else {
retTp.SetFlen(mysql.MaxDecimalWidth)
retTp.SetDecimal(mysql.MaxDecimalScale)
}
}
func (c *arithmeticDivideFunctionClass) setType4DivDecimal(retTp, a, b *types.FieldType) {
var deca, decb = a.GetDecimal(), b.GetDecimal()
if deca == types.UnspecifiedFsp {
deca = 0
}
if decb == types.UnspecifiedFsp {
decb = 0
}
retTp.SetDecimalUnderLimit(deca + precIncrement)
if a.GetFlen() == types.UnspecifiedLength {
retTp.SetFlen(mysql.MaxDecimalWidth)
return
}
aPrec := types.DecimalLength2Precision(a.GetFlen(), a.GetDecimal(), mysql.HasUnsignedFlag(a.GetFlag()))
retTp.SetFlenUnderLimit(aPrec + decb + precIncrement)
retTp.SetFlenUnderLimit(types.Precision2LengthNoTruncation(retTp.GetFlen(), retTp.GetDecimal(), mysql.HasUnsignedFlag(retTp.GetFlag())))
}
func (c *arithmeticDivideFunctionClass) setType4DivReal(retTp *types.FieldType) {
retTp.SetDecimal(types.UnspecifiedLength)
retTp.SetFlen(mysql.MaxRealWidth)
}
type arithmeticPlusFunctionClass struct {
baseFunctionClass
}
func (c *arithmeticPlusFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := c.verifyArgs(args); err != nil {
return nil, err
}
lhsEvalTp, rhsEvalTp := numericContextResultType(args[0]), numericContextResultType(args[1])
if lhsEvalTp == types.ETReal || rhsEvalTp == types.ETReal {
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETReal, types.ETReal, types.ETReal)
if err != nil {
return nil, err
}
setFlenDecimal4RealOrDecimal(ctx, bf.tp, args[0], args[1], true, false)
sig := &builtinArithmeticPlusRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_PlusReal)
return sig, nil
} else if lhsEvalTp == types.ETDecimal || rhsEvalTp == types.ETDecimal {
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETDecimal, types.ETDecimal, types.ETDecimal)
if err != nil {
return nil, err
}
setFlenDecimal4RealOrDecimal(ctx, bf.tp, args[0], args[1], false, false)
sig := &builtinArithmeticPlusDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_PlusDecimal)
return sig, nil
}
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETInt, types.ETInt, types.ETInt)
if err != nil {
return nil, err
}
if mysql.HasUnsignedFlag(args[0].GetType().GetFlag()) || mysql.HasUnsignedFlag(args[1].GetType().GetFlag()) {
bf.tp.AddFlag(mysql.UnsignedFlag)
}
sig := &builtinArithmeticPlusIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_PlusInt)
return sig, nil
}
type builtinArithmeticPlusIntSig struct {
baseBuiltinFunc
}
func (s *builtinArithmeticPlusIntSig) Clone() builtinFunc {
newSig := &builtinArithmeticPlusIntSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticPlusIntSig) evalInt(ctx EvalContext, row chunk.Row) (val int64, isNull bool, err error) {
a, isNull, err := s.args[0].EvalInt(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
b, isNull, err := s.args[1].EvalInt(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
isLHSUnsigned := mysql.HasUnsignedFlag(s.args[0].GetType().GetFlag())
isRHSUnsigned := mysql.HasUnsignedFlag(s.args[1].GetType().GetFlag())
switch {
case isLHSUnsigned && isRHSUnsigned:
if uint64(a) > math.MaxUint64-uint64(b) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("BIGINT UNSIGNED", fmt.Sprintf("(%s + %s)", s.args[0].String(), s.args[1].String()))
}
case isLHSUnsigned && !isRHSUnsigned:
if b < 0 && uint64(-b) > uint64(a) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("BIGINT UNSIGNED", fmt.Sprintf("(%s + %s)", s.args[0].String(), s.args[1].String()))
}
if b > 0 && uint64(a) > math.MaxUint64-uint64(b) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("BIGINT UNSIGNED", fmt.Sprintf("(%s + %s)", s.args[0].String(), s.args[1].String()))
}
case !isLHSUnsigned && isRHSUnsigned:
if a < 0 && uint64(-a) > uint64(b) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("BIGINT UNSIGNED", fmt.Sprintf("(%s + %s)", s.args[0].String(), s.args[1].String()))
}
if a > 0 && uint64(b) > math.MaxUint64-uint64(a) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("BIGINT UNSIGNED", fmt.Sprintf("(%s + %s)", s.args[0].String(), s.args[1].String()))
}
case !isLHSUnsigned && !isRHSUnsigned:
if (a > 0 && b > math.MaxInt64-a) || (a < 0 && b < math.MinInt64-a) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("BIGINT", fmt.Sprintf("(%s + %s)", s.args[0].String(), s.args[1].String()))
}
}
return a + b, false, nil
}
type builtinArithmeticPlusDecimalSig struct {
baseBuiltinFunc
}
func (s *builtinArithmeticPlusDecimalSig) Clone() builtinFunc {
newSig := &builtinArithmeticPlusDecimalSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticPlusDecimalSig) evalDecimal(ctx EvalContext, row chunk.Row) (*types.MyDecimal, bool, error) {
a, isNull, err := s.args[0].EvalDecimal(ctx, row)
if isNull || err != nil {
return nil, isNull, err
}
b, isNull, err := s.args[1].EvalDecimal(ctx, row)
if isNull || err != nil {
return nil, isNull, err
}
c := &types.MyDecimal{}
err = types.DecimalAdd(a, b, c)
if err != nil {
if err == types.ErrOverflow {
err = types.ErrOverflow.GenWithStackByArgs("DECIMAL", fmt.Sprintf("(%s + %s)", s.args[0].String(), s.args[1].String()))
}
return nil, true, err
}
return c, false, nil
}
type builtinArithmeticPlusRealSig struct {
baseBuiltinFunc
}
func (s *builtinArithmeticPlusRealSig) Clone() builtinFunc {
newSig := &builtinArithmeticPlusRealSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticPlusRealSig) evalReal(ctx EvalContext, row chunk.Row) (float64, bool, error) {
a, isLHSNull, err := s.args[0].EvalReal(ctx, row)
if err != nil {
return 0, isLHSNull, err
}
b, isRHSNull, err := s.args[1].EvalReal(ctx, row)
if err != nil {
return 0, isRHSNull, err
}
if isLHSNull || isRHSNull {
return 0, true, nil
}
if !mathutil.IsFinite(a + b) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("DOUBLE", fmt.Sprintf("(%s + %s)", s.args[0].String(), s.args[1].String()))
}
return a + b, false, nil
}
type arithmeticMinusFunctionClass struct {
baseFunctionClass
}
func (c *arithmeticMinusFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := c.verifyArgs(args); err != nil {
return nil, err
}
lhsEvalTp, rhsEvalTp := numericContextResultType(args[0]), numericContextResultType(args[1])
if lhsEvalTp == types.ETReal || rhsEvalTp == types.ETReal {
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETReal, types.ETReal, types.ETReal)
if err != nil {
return nil, err
}
setFlenDecimal4RealOrDecimal(ctx, bf.tp, args[0], args[1], true, false)
sig := &builtinArithmeticMinusRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_MinusReal)
return sig, nil
} else if lhsEvalTp == types.ETDecimal || rhsEvalTp == types.ETDecimal {
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETDecimal, types.ETDecimal, types.ETDecimal)
if err != nil {
return nil, err
}
setFlenDecimal4RealOrDecimal(ctx, bf.tp, args[0], args[1], false, false)
sig := &builtinArithmeticMinusDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_MinusDecimal)
return sig, nil
}
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETInt, types.ETInt, types.ETInt)
if err != nil {
return nil, err
}
if (mysql.HasUnsignedFlag(args[0].GetType().GetFlag()) || mysql.HasUnsignedFlag(args[1].GetType().GetFlag())) && !ctx.GetSessionVars().SQLMode.HasNoUnsignedSubtractionMode() {
bf.tp.AddFlag(mysql.UnsignedFlag)
}
sig := &builtinArithmeticMinusIntSig{baseBuiltinFunc: bf}
sig.setPbCode(tipb.ScalarFuncSig_MinusInt)
return sig, nil
}
type builtinArithmeticMinusRealSig struct {
baseBuiltinFunc
}
func (s *builtinArithmeticMinusRealSig) Clone() builtinFunc {
newSig := &builtinArithmeticMinusRealSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticMinusRealSig) evalReal(ctx EvalContext, row chunk.Row) (float64, bool, error) {
a, isNull, err := s.args[0].EvalReal(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
b, isNull, err := s.args[1].EvalReal(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
if !mathutil.IsFinite(a - b) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("DOUBLE", fmt.Sprintf("(%s - %s)", s.args[0].String(), s.args[1].String()))
}
return a - b, false, nil
}
type builtinArithmeticMinusDecimalSig struct {
baseBuiltinFunc
}
func (s *builtinArithmeticMinusDecimalSig) Clone() builtinFunc {
newSig := &builtinArithmeticMinusDecimalSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticMinusDecimalSig) evalDecimal(ctx EvalContext, row chunk.Row) (*types.MyDecimal, bool, error) {
a, isNull, err := s.args[0].EvalDecimal(ctx, row)
if isNull || err != nil {
return nil, isNull, err
}
b, isNull, err := s.args[1].EvalDecimal(ctx, row)
if isNull || err != nil {
return nil, isNull, err
}
c := &types.MyDecimal{}
err = types.DecimalSub(a, b, c)
if err != nil {
if err == types.ErrOverflow {
err = types.ErrOverflow.GenWithStackByArgs("DECIMAL", fmt.Sprintf("(%s - %s)", s.args[0].String(), s.args[1].String()))
}
return nil, true, err
}
return c, false, nil
}
type builtinArithmeticMinusIntSig struct {
baseBuiltinFunc
}
func (s *builtinArithmeticMinusIntSig) Clone() builtinFunc {
newSig := &builtinArithmeticMinusIntSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticMinusIntSig) evalInt(ctx EvalContext, row chunk.Row) (val int64, isNull bool, err error) {
a, isNull, err := s.args[0].EvalInt(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
b, isNull, err := s.args[1].EvalInt(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
forceToSigned := ctx.GetSessionVars().SQLMode.HasNoUnsignedSubtractionMode()
isLHSUnsigned := mysql.HasUnsignedFlag(s.args[0].GetType().GetFlag())
isRHSUnsigned := mysql.HasUnsignedFlag(s.args[1].GetType().GetFlag())
errType := "BIGINT UNSIGNED"
signed := forceToSigned || (!isLHSUnsigned && !isRHSUnsigned)
if signed {
errType = "BIGINT"
}
overflow := s.overflowCheck(isLHSUnsigned, isRHSUnsigned, signed, a, b)
if overflow {
return 0, true, types.ErrOverflow.GenWithStackByArgs(errType, fmt.Sprintf("(%s - %s)", s.args[0].String(), s.args[1].String()))
}
return a - b, false, nil
}
// returns true when overflowed
func (s *builtinArithmeticMinusIntSig) overflowCheck(isLHSUnsigned, isRHSUnsigned, signed bool, a, b int64) bool {
res := a - b
ua, ub := uint64(a), uint64(b)
resUnsigned := false
if isLHSUnsigned {
if isRHSUnsigned {
if ua < ub {
if res >= 0 {
return true
}
} else {
resUnsigned = true
}
} else {
if b >= 0 {
if ua > ub {
resUnsigned = true
}
} else {
if testIfSumOverflowsUll(ua, uint64(-b)) {
return true
}
resUnsigned = true
}
}
} else {
if isRHSUnsigned {
if uint64(a-math.MinInt64) < ub {
return true
}
} else {
if a > 0 && b < 0 {
resUnsigned = true
} else if a < 0 && b > 0 && res >= 0 {
return true
}
}
}
if (!signed && !resUnsigned && res < 0) || (signed && resUnsigned && uint64(res) > uint64(math.MaxInt64)) {
return true
}
return false
}
func testIfSumOverflowsUll(a, b uint64) bool {
return math.MaxUint64-a < b
}
type arithmeticMultiplyFunctionClass struct {
baseFunctionClass
}
func (c *arithmeticMultiplyFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := c.verifyArgs(args); err != nil {
return nil, err
}
lhsTp, rhsTp := args[0].GetType(), args[1].GetType()
lhsEvalTp, rhsEvalTp := numericContextResultType(args[0]), numericContextResultType(args[1])
if lhsEvalTp == types.ETReal || rhsEvalTp == types.ETReal {
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETReal, types.ETReal, types.ETReal)
if err != nil {
return nil, err
}
setFlenDecimal4RealOrDecimal(ctx, bf.tp, args[0], args[1], true, true)
sig := &builtinArithmeticMultiplyRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_MultiplyReal)
return sig, nil
} else if lhsEvalTp == types.ETDecimal || rhsEvalTp == types.ETDecimal {
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETDecimal, types.ETDecimal, types.ETDecimal)
if err != nil {
return nil, err
}
setFlenDecimal4RealOrDecimal(ctx, bf.tp, args[0], args[1], false, true)
sig := &builtinArithmeticMultiplyDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_MultiplyDecimal)
return sig, nil
}
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETInt, types.ETInt, types.ETInt)
if err != nil {
return nil, err
}
if mysql.HasUnsignedFlag(lhsTp.GetFlag()) || mysql.HasUnsignedFlag(rhsTp.GetFlag()) {
bf.tp.AddFlag(mysql.UnsignedFlag)
sig := &builtinArithmeticMultiplyIntUnsignedSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_MultiplyIntUnsigned)
return sig, nil
}
sig := &builtinArithmeticMultiplyIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_MultiplyInt)
return sig, nil
}
type builtinArithmeticMultiplyRealSig struct{ baseBuiltinFunc }
func (s *builtinArithmeticMultiplyRealSig) Clone() builtinFunc {
newSig := &builtinArithmeticMultiplyRealSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
type builtinArithmeticMultiplyDecimalSig struct{ baseBuiltinFunc }
func (s *builtinArithmeticMultiplyDecimalSig) Clone() builtinFunc {
newSig := &builtinArithmeticMultiplyDecimalSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
type builtinArithmeticMultiplyIntUnsignedSig struct{ baseBuiltinFunc }
func (s *builtinArithmeticMultiplyIntUnsignedSig) Clone() builtinFunc {
newSig := &builtinArithmeticMultiplyIntUnsignedSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
type builtinArithmeticMultiplyIntSig struct{ baseBuiltinFunc }
func (s *builtinArithmeticMultiplyIntSig) Clone() builtinFunc {
newSig := &builtinArithmeticMultiplyIntSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticMultiplyRealSig) evalReal(ctx EvalContext, row chunk.Row) (float64, bool, error) {
a, isNull, err := s.args[0].EvalReal(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
b, isNull, err := s.args[1].EvalReal(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
result := a * b
if math.IsInf(result, 0) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("DOUBLE", fmt.Sprintf("(%s * %s)", s.args[0].String(), s.args[1].String()))
}
return result, false, nil
}
func (s *builtinArithmeticMultiplyDecimalSig) evalDecimal(ctx EvalContext, row chunk.Row) (*types.MyDecimal, bool, error) {
a, isNull, err := s.args[0].EvalDecimal(ctx, row)
if isNull || err != nil {
return nil, isNull, err
}
b, isNull, err := s.args[1].EvalDecimal(ctx, row)
if isNull || err != nil {
return nil, isNull, err
}
c := &types.MyDecimal{}
err = types.DecimalMul(a, b, c)
if err != nil && !terror.ErrorEqual(err, types.ErrTruncated) {
if err == types.ErrOverflow {
err = types.ErrOverflow.GenWithStackByArgs("DECIMAL", fmt.Sprintf("(%s * %s)", s.args[0].String(), s.args[1].String()))
}
return nil, true, err
}
return c, false, nil
}
func (s *builtinArithmeticMultiplyIntUnsignedSig) evalInt(ctx EvalContext, row chunk.Row) (val int64, isNull bool, err error) {
a, isNull, err := s.args[0].EvalInt(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
unsignedA := uint64(a)
b, isNull, err := s.args[1].EvalInt(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
unsignedB := uint64(b)
result := unsignedA * unsignedB
if unsignedA != 0 && result/unsignedA != unsignedB {
return 0, true, types.ErrOverflow.GenWithStackByArgs("BIGINT UNSIGNED", fmt.Sprintf("(%s * %s)", s.args[0].String(), s.args[1].String()))
}
return int64(result), false, nil
}
func (s *builtinArithmeticMultiplyIntSig) evalInt(ctx EvalContext, row chunk.Row) (val int64, isNull bool, err error) {
a, isNull, err := s.args[0].EvalInt(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
b, isNull, err := s.args[1].EvalInt(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
result := a * b
if (a != 0 && result/a != b) || (result == math.MinInt64 && a == -1) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("BIGINT", fmt.Sprintf("(%s * %s)", s.args[0].String(), s.args[1].String()))
}
return result, false, nil
}
type arithmeticDivideFunctionClass struct {
baseFunctionClass
}
func (c *arithmeticDivideFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := c.verifyArgs(args); err != nil {
return nil, err
}
lhsTp, rhsTp := args[0].GetType(), args[1].GetType()
lhsEvalTp, rhsEvalTp := numericContextResultType(args[0]), numericContextResultType(args[1])
if lhsEvalTp == types.ETReal || rhsEvalTp == types.ETReal {
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETReal, types.ETReal, types.ETReal)
if err != nil {
return nil, err
}
c.setType4DivReal(bf.tp)
sig := &builtinArithmeticDivideRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_DivideReal)
return sig, nil
}
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETDecimal, types.ETDecimal, types.ETDecimal)
if err != nil {
return nil, err
}
c.setType4DivDecimal(bf.tp, lhsTp, rhsTp)
sig := &builtinArithmeticDivideDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_DivideDecimal)
return sig, nil
}
type builtinArithmeticDivideRealSig struct{ baseBuiltinFunc }
func (s *builtinArithmeticDivideRealSig) Clone() builtinFunc {
newSig := &builtinArithmeticDivideRealSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
type builtinArithmeticDivideDecimalSig struct{ baseBuiltinFunc }
func (s *builtinArithmeticDivideDecimalSig) Clone() builtinFunc {
newSig := &builtinArithmeticDivideDecimalSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticDivideRealSig) evalReal(ctx EvalContext, row chunk.Row) (float64, bool, error) {
a, isNull, err := s.args[0].EvalReal(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
b, isNull, err := s.args[1].EvalReal(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
if b == 0 {
return 0, true, handleDivisionByZeroError(ctx)
}
result := a / b
if math.IsInf(result, 0) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("DOUBLE", fmt.Sprintf("(%s / %s)", s.args[0].String(), s.args[1].String()))
}
return result, false, nil
}
func (s *builtinArithmeticDivideDecimalSig) evalDecimal(ctx EvalContext, row chunk.Row) (*types.MyDecimal, bool, error) {
a, isNull, err := s.args[0].EvalDecimal(ctx, row)
if isNull || err != nil {
return nil, isNull, err
}
b, isNull, err := s.args[1].EvalDecimal(ctx, row)
if isNull || err != nil {
return nil, isNull, err
}
c := &types.MyDecimal{}
err = types.DecimalDiv(a, b, c, types.DivFracIncr)
if err == types.ErrDivByZero {
return c, true, handleDivisionByZeroError(ctx)
} else if err == types.ErrTruncated {
sc := ctx.GetSessionVars().StmtCtx
err = sc.HandleTruncate(errTruncatedWrongValue.GenWithStackByArgs("DECIMAL", c))
} else if err == nil {
_, frac := c.PrecisionAndFrac()
if frac < s.baseBuiltinFunc.tp.GetDecimal() {
err = c.Round(c, s.baseBuiltinFunc.tp.GetDecimal(), types.ModeHalfUp)
}
} else if err == types.ErrOverflow {
err = types.ErrOverflow.GenWithStackByArgs("DECIMAL", fmt.Sprintf("(%s / %s)", s.args[0].String(), s.args[1].String()))
}
return c, false, err
}
type arithmeticIntDivideFunctionClass struct {
baseFunctionClass
}
func (c *arithmeticIntDivideFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := c.verifyArgs(args); err != nil {
return nil, err
}
lhsTp, rhsTp := args[0].GetType(), args[1].GetType()
lhsEvalTp, rhsEvalTp := numericContextResultType(args[0]), numericContextResultType(args[1])
if lhsEvalTp == types.ETInt && rhsEvalTp == types.ETInt {
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETInt, types.ETInt, types.ETInt)
if err != nil {
return nil, err
}
if mysql.HasUnsignedFlag(lhsTp.GetFlag()) || mysql.HasUnsignedFlag(rhsTp.GetFlag()) {
bf.tp.AddFlag(mysql.UnsignedFlag)
}
sig := &builtinArithmeticIntDivideIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_IntDivideInt)
return sig, nil
}
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETInt, types.ETDecimal, types.ETDecimal)
if err != nil {
return nil, err
}
if mysql.HasUnsignedFlag(lhsTp.GetFlag()) || mysql.HasUnsignedFlag(rhsTp.GetFlag()) {
bf.tp.AddFlag(mysql.UnsignedFlag)
}
sig := &builtinArithmeticIntDivideDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_IntDivideDecimal)
return sig, nil
}
type builtinArithmeticIntDivideIntSig struct{ baseBuiltinFunc }
func (s *builtinArithmeticIntDivideIntSig) Clone() builtinFunc {
newSig := &builtinArithmeticIntDivideIntSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
type builtinArithmeticIntDivideDecimalSig struct{ baseBuiltinFunc }
func (s *builtinArithmeticIntDivideDecimalSig) Clone() builtinFunc {
newSig := &builtinArithmeticIntDivideDecimalSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticIntDivideIntSig) evalInt(ctx EvalContext, row chunk.Row) (int64, bool, error) {
b, bIsNull, err := s.args[1].EvalInt(ctx, row)
if bIsNull || err != nil {
return 0, bIsNull, err
}
a, aIsNull, err := s.args[0].EvalInt(ctx, row)
if aIsNull || err != nil {
return 0, aIsNull, err
}
if b == 0 {
return 0, true, handleDivisionByZeroError(ctx)
}
var (
ret int64
val uint64
)
isLHSUnsigned := mysql.HasUnsignedFlag(s.args[0].GetType().GetFlag())
isRHSUnsigned := mysql.HasUnsignedFlag(s.args[1].GetType().GetFlag())
switch {
case isLHSUnsigned && isRHSUnsigned:
ret = int64(uint64(a) / uint64(b))
case isLHSUnsigned && !isRHSUnsigned:
val, err = types.DivUintWithInt(uint64(a), b)
ret = int64(val)
case !isLHSUnsigned && isRHSUnsigned:
val, err = types.DivIntWithUint(a, uint64(b))
ret = int64(val)
case !isLHSUnsigned && !isRHSUnsigned:
ret, err = types.DivInt64(a, b)
}
return ret, err != nil, err
}
func (s *builtinArithmeticIntDivideDecimalSig) evalInt(ctx EvalContext, row chunk.Row) (ret int64, isNull bool, err error) {
sc := ctx.GetSessionVars().StmtCtx
var num [2]*types.MyDecimal
for i, arg := range s.args {
num[i], isNull, err = arg.EvalDecimal(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
}
c := &types.MyDecimal{}
err = types.DecimalDiv(num[0], num[1], c, types.DivFracIncr)
if err == types.ErrDivByZero {
return 0, true, handleDivisionByZeroError(ctx)
}
if err == types.ErrTruncated {
err = sc.HandleTruncate(errTruncatedWrongValue.GenWithStackByArgs("DECIMAL", c))
}
if err == types.ErrOverflow {
newErr := errTruncatedWrongValue.GenWithStackByArgs("DECIMAL", c)
err = sc.HandleError(newErr)
}
if err != nil {
return 0, true, err
}
isLHSUnsigned := mysql.HasUnsignedFlag(s.args[0].GetType().GetFlag())
isRHSUnsigned := mysql.HasUnsignedFlag(s.args[1].GetType().GetFlag())
if isLHSUnsigned || isRHSUnsigned {
val, err := c.ToUint()
// err returned by ToUint may be ErrTruncated or ErrOverflow, only handle ErrOverflow, ignore ErrTruncated.
if err == types.ErrOverflow {
v, err := c.ToInt()
// when the final result is at (-1, 0], it should be return 0 instead of the error
if v == 0 && err == types.ErrTruncated {
ret = int64(0)
return ret, false, nil
}
return 0, true, types.ErrOverflow.GenWithStackByArgs("BIGINT UNSIGNED", fmt.Sprintf("(%s DIV %s)", s.args[0].String(), s.args[1].String()))
}
ret = int64(val)
} else {
ret, err = c.ToInt()
// err returned by ToInt may be ErrTruncated or ErrOverflow, only handle ErrOverflow, ignore ErrTruncated.
if err == types.ErrOverflow {
return 0, true, types.ErrOverflow.GenWithStackByArgs("BIGINT", fmt.Sprintf("(%s DIV %s)", s.args[0].String(), s.args[1].String()))
}
}
return ret, false, nil
}
type arithmeticModFunctionClass struct {
baseFunctionClass
}
func (c *arithmeticModFunctionClass) setType4ModRealOrDecimal(retTp, a, b *types.FieldType, isDecimal bool) {
if a.GetDecimal() == types.UnspecifiedLength || b.GetDecimal() == types.UnspecifiedLength {
retTp.SetDecimal(types.UnspecifiedLength)
} else {
retTp.SetDecimalUnderLimit(mathutil.Max(a.GetDecimal(), b.GetDecimal()))
}
if a.GetFlen() == types.UnspecifiedLength || b.GetFlen() == types.UnspecifiedLength {
retTp.SetFlen(types.UnspecifiedLength)
} else {
retTp.SetFlen(mathutil.Max(a.GetFlen(), b.GetFlen()))
if isDecimal {
retTp.SetFlenUnderLimit(retTp.GetFlen())
return
}
retTp.SetFlen(mathutil.Min(retTp.GetFlen(), mysql.MaxRealWidth))
}
}
func (c *arithmeticModFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (builtinFunc, error) {
if err := c.verifyArgs(args); err != nil {
return nil, err
}
lhsTp, rhsTp := args[0].GetType(), args[1].GetType()
lhsEvalTp, rhsEvalTp := numericContextResultType(args[0]), numericContextResultType(args[1])
if lhsEvalTp == types.ETReal || rhsEvalTp == types.ETReal {
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETReal, types.ETReal, types.ETReal)
if err != nil {
return nil, err
}
c.setType4ModRealOrDecimal(bf.tp, lhsTp, rhsTp, false)
if mysql.HasUnsignedFlag(lhsTp.GetFlag()) {
bf.tp.AddFlag(mysql.UnsignedFlag)
}
sig := &builtinArithmeticModRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_ModReal)
return sig, nil
} else if lhsEvalTp == types.ETDecimal || rhsEvalTp == types.ETDecimal {
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETDecimal, types.ETDecimal, types.ETDecimal)
if err != nil {
return nil, err
}
c.setType4ModRealOrDecimal(bf.tp, lhsTp, rhsTp, true)
if mysql.HasUnsignedFlag(lhsTp.GetFlag()) {
bf.tp.AddFlag(mysql.UnsignedFlag)
}
sig := &builtinArithmeticModDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_ModDecimal)
return sig, nil
}
bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETInt, types.ETInt, types.ETInt)
if err != nil {
return nil, err
}
if mysql.HasUnsignedFlag(lhsTp.GetFlag()) {
bf.tp.AddFlag(mysql.UnsignedFlag)
}
isLHSUnsigned := mysql.HasUnsignedFlag(args[0].GetType().GetFlag())
isRHSUnsigned := mysql.HasUnsignedFlag(args[1].GetType().GetFlag())
switch {
case isLHSUnsigned && isRHSUnsigned:
sig := &builtinArithmeticModIntUnsignedUnsignedSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_ModIntUnsignedUnsigned)
return sig, nil
case isLHSUnsigned && !isRHSUnsigned:
sig := &builtinArithmeticModIntUnsignedSignedSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_ModIntUnsignedSigned)
return sig, nil
case !isLHSUnsigned && isRHSUnsigned:
sig := &builtinArithmeticModIntSignedUnsignedSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_ModIntSignedUnsigned)
return sig, nil
default:
sig := &builtinArithmeticModIntSignedSignedSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_ModIntSignedSigned)
return sig, nil
}
}
type builtinArithmeticModRealSig struct {
baseBuiltinFunc
}
func (s *builtinArithmeticModRealSig) Clone() builtinFunc {
newSig := &builtinArithmeticModRealSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticModRealSig) evalReal(ctx EvalContext, row chunk.Row) (float64, bool, error) {
b, isNull, err := s.args[1].EvalReal(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
if b == 0 {
return 0, true, handleDivisionByZeroError(ctx)
}
a, isNull, err := s.args[0].EvalReal(ctx, row)
if isNull || err != nil {
return 0, isNull, err
}
return math.Mod(a, b), false, nil
}
type builtinArithmeticModDecimalSig struct {
baseBuiltinFunc
}
func (s *builtinArithmeticModDecimalSig) Clone() builtinFunc {
newSig := &builtinArithmeticModDecimalSig{}
newSig.cloneFrom(&s.baseBuiltinFunc)
return newSig
}
func (s *builtinArithmeticModDecimalSig) evalDecimal(ctx EvalContext, row chunk.Row) (*types.MyDecimal, bool, error) {