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builtin_cast.go
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builtin_cast.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,
// See the License for the specific language governing permissions and
// limitations under the License.
// We implement 6 CastAsXXFunctionClass for `cast` built-in functions.
// XX means the return type of the `cast` built-in functions.
// XX contains the following 6 types:
// Int, Decimal, Real, String, Time, Duration.
// We implement 6 CastYYAsXXSig built-in function signatures for every CastAsXXFunctionClass.
// builtinCastXXAsYYSig takes a argument of type XX and returns a value of type YY.
package expression
import (
"math"
"strconv"
"strings"
"github.com/juju/errors"
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/terror"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/types/json"
"github.com/pingcap/tidb/util/charset"
"github.com/pingcap/tipb/go-tipb"
)
var (
_ functionClass = &castAsIntFunctionClass{}
_ functionClass = &castAsRealFunctionClass{}
_ functionClass = &castAsStringFunctionClass{}
_ functionClass = &castAsDecimalFunctionClass{}
_ functionClass = &castAsTimeFunctionClass{}
_ functionClass = &castAsDurationFunctionClass{}
_ functionClass = &castAsJSONFunctionClass{}
)
var (
_ builtinFunc = &builtinCastIntAsIntSig{}
_ builtinFunc = &builtinCastIntAsRealSig{}
_ builtinFunc = &builtinCastIntAsStringSig{}
_ builtinFunc = &builtinCastIntAsDecimalSig{}
_ builtinFunc = &builtinCastIntAsTimeSig{}
_ builtinFunc = &builtinCastIntAsDurationSig{}
_ builtinFunc = &builtinCastIntAsJSONSig{}
_ builtinFunc = &builtinCastRealAsIntSig{}
_ builtinFunc = &builtinCastRealAsRealSig{}
_ builtinFunc = &builtinCastRealAsStringSig{}
_ builtinFunc = &builtinCastRealAsDecimalSig{}
_ builtinFunc = &builtinCastRealAsTimeSig{}
_ builtinFunc = &builtinCastRealAsDurationSig{}
_ builtinFunc = &builtinCastRealAsJSONSig{}
_ builtinFunc = &builtinCastDecimalAsIntSig{}
_ builtinFunc = &builtinCastDecimalAsRealSig{}
_ builtinFunc = &builtinCastDecimalAsStringSig{}
_ builtinFunc = &builtinCastDecimalAsDecimalSig{}
_ builtinFunc = &builtinCastDecimalAsTimeSig{}
_ builtinFunc = &builtinCastDecimalAsDurationSig{}
_ builtinFunc = &builtinCastDecimalAsJSONSig{}
_ builtinFunc = &builtinCastStringAsIntSig{}
_ builtinFunc = &builtinCastStringAsRealSig{}
_ builtinFunc = &builtinCastStringAsStringSig{}
_ builtinFunc = &builtinCastStringAsDecimalSig{}
_ builtinFunc = &builtinCastStringAsTimeSig{}
_ builtinFunc = &builtinCastStringAsDurationSig{}
_ builtinFunc = &builtinCastStringAsJSONSig{}
_ builtinFunc = &builtinCastTimeAsIntSig{}
_ builtinFunc = &builtinCastTimeAsRealSig{}
_ builtinFunc = &builtinCastTimeAsStringSig{}
_ builtinFunc = &builtinCastTimeAsDecimalSig{}
_ builtinFunc = &builtinCastTimeAsTimeSig{}
_ builtinFunc = &builtinCastTimeAsDurationSig{}
_ builtinFunc = &builtinCastTimeAsJSONSig{}
_ builtinFunc = &builtinCastDurationAsIntSig{}
_ builtinFunc = &builtinCastDurationAsRealSig{}
_ builtinFunc = &builtinCastDurationAsStringSig{}
_ builtinFunc = &builtinCastDurationAsDecimalSig{}
_ builtinFunc = &builtinCastDurationAsTimeSig{}
_ builtinFunc = &builtinCastDurationAsDurationSig{}
_ builtinFunc = &builtinCastDurationAsJSONSig{}
_ builtinFunc = &builtinCastJSONAsIntSig{}
_ builtinFunc = &builtinCastJSONAsRealSig{}
_ builtinFunc = &builtinCastJSONAsStringSig{}
_ builtinFunc = &builtinCastJSONAsDecimalSig{}
_ builtinFunc = &builtinCastJSONAsTimeSig{}
_ builtinFunc = &builtinCastJSONAsDurationSig{}
_ builtinFunc = &builtinCastJSONAsJSONSig{}
)
type castAsIntFunctionClass struct {
baseFunctionClass
tp *types.FieldType
}
func (c *castAsIntFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (sig builtinFunc, err error) {
if err := c.verifyArgs(args); err != nil {
return nil, errors.Trace(err)
}
bf := newBaseBuiltinFunc(ctx, args)
bf.tp = c.tp
if args[0].GetType().Hybrid() || IsBinaryLiteral(args[0]) {
sig = &builtinCastIntAsIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastIntAsInt)
return sig, nil
}
argTp := args[0].GetType().EvalType()
switch argTp {
case types.ETInt:
sig = &builtinCastIntAsIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastIntAsInt)
case types.ETReal:
sig = &builtinCastRealAsIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastRealAsInt)
case types.ETDecimal:
sig = &builtinCastDecimalAsIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDecimalAsInt)
case types.ETDatetime, types.ETTimestamp:
sig = &builtinCastTimeAsIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastTimeAsInt)
case types.ETDuration:
sig = &builtinCastDurationAsIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDurationAsInt)
case types.ETJson:
sig = &builtinCastJSONAsIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastJsonAsInt)
case types.ETString:
sig = &builtinCastStringAsIntSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastStringAsInt)
default:
panic("unsupported types.EvalType in castAsIntFunctionClass")
}
return sig, nil
}
type castAsRealFunctionClass struct {
baseFunctionClass
tp *types.FieldType
}
func (c *castAsRealFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (sig builtinFunc, err error) {
if err := c.verifyArgs(args); err != nil {
return nil, errors.Trace(err)
}
bf := newBaseBuiltinFunc(ctx, args)
bf.tp = c.tp
if IsBinaryLiteral(args[0]) {
sig = &builtinCastRealAsRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastRealAsReal)
return sig, nil
}
var argTp types.EvalType
if args[0].GetType().Hybrid() {
argTp = types.ETInt
} else {
argTp = args[0].GetType().EvalType()
}
switch argTp {
case types.ETInt:
sig = &builtinCastIntAsRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastIntAsReal)
case types.ETReal:
sig = &builtinCastRealAsRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastRealAsReal)
case types.ETDecimal:
sig = &builtinCastDecimalAsRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDecimalAsReal)
case types.ETDatetime, types.ETTimestamp:
sig = &builtinCastTimeAsRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastTimeAsReal)
case types.ETDuration:
sig = &builtinCastDurationAsRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDurationAsReal)
case types.ETJson:
sig = &builtinCastJSONAsRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastJsonAsReal)
case types.ETString:
sig = &builtinCastStringAsRealSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastStringAsReal)
default:
panic("unsupported types.EvalType in castAsRealFunctionClass")
}
return sig, nil
}
type castAsDecimalFunctionClass struct {
baseFunctionClass
tp *types.FieldType
}
func (c *castAsDecimalFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (sig builtinFunc, err error) {
if err := c.verifyArgs(args); err != nil {
return nil, errors.Trace(err)
}
bf := newBaseBuiltinFunc(ctx, args)
bf.tp = c.tp
if IsBinaryLiteral(args[0]) {
sig = &builtinCastDecimalAsDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDecimalAsDecimal)
return sig, nil
}
var argTp types.EvalType
if args[0].GetType().Hybrid() {
argTp = types.ETInt
} else {
argTp = args[0].GetType().EvalType()
}
switch argTp {
case types.ETInt:
sig = &builtinCastIntAsDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastIntAsDecimal)
case types.ETReal:
sig = &builtinCastRealAsDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastRealAsDecimal)
case types.ETDecimal:
sig = &builtinCastDecimalAsDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDecimalAsDecimal)
case types.ETDatetime, types.ETTimestamp:
sig = &builtinCastTimeAsDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastTimeAsDecimal)
case types.ETDuration:
sig = &builtinCastDurationAsDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDurationAsDecimal)
case types.ETJson:
sig = &builtinCastJSONAsDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastJsonAsDecimal)
case types.ETString:
sig = &builtinCastStringAsDecimalSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastStringAsDecimal)
default:
panic("unsupported types.EvalType in castAsDecimalFunctionClass")
}
return sig, nil
}
type castAsStringFunctionClass struct {
baseFunctionClass
tp *types.FieldType
}
func (c *castAsStringFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (sig builtinFunc, err error) {
if err := c.verifyArgs(args); err != nil {
return nil, errors.Trace(err)
}
bf := newBaseBuiltinFunc(ctx, args)
bf.tp = c.tp
if args[0].GetType().Hybrid() || IsBinaryLiteral(args[0]) {
sig = &builtinCastStringAsStringSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastStringAsString)
return sig, nil
}
argTp := args[0].GetType().EvalType()
switch argTp {
case types.ETInt:
sig = &builtinCastIntAsStringSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastIntAsString)
case types.ETReal:
sig = &builtinCastRealAsStringSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastRealAsString)
case types.ETDecimal:
sig = &builtinCastDecimalAsStringSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDecimalAsString)
case types.ETDatetime, types.ETTimestamp:
sig = &builtinCastTimeAsStringSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastTimeAsString)
case types.ETDuration:
sig = &builtinCastDurationAsStringSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDurationAsString)
case types.ETJson:
sig = &builtinCastJSONAsStringSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastJsonAsString)
case types.ETString:
sig = &builtinCastStringAsStringSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastStringAsString)
default:
panic("unsupported types.EvalType in castAsStringFunctionClass")
}
return sig, nil
}
type castAsTimeFunctionClass struct {
baseFunctionClass
tp *types.FieldType
}
func (c *castAsTimeFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (sig builtinFunc, err error) {
if err := c.verifyArgs(args); err != nil {
return nil, errors.Trace(err)
}
bf := newBaseBuiltinFunc(ctx, args)
bf.tp = c.tp
argTp := args[0].GetType().EvalType()
switch argTp {
case types.ETInt:
sig = &builtinCastIntAsTimeSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastIntAsTime)
case types.ETReal:
sig = &builtinCastRealAsTimeSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastRealAsTime)
case types.ETDecimal:
sig = &builtinCastDecimalAsTimeSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDecimalAsTime)
case types.ETDatetime, types.ETTimestamp:
sig = &builtinCastTimeAsTimeSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastTimeAsTime)
case types.ETDuration:
sig = &builtinCastDurationAsTimeSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDurationAsTime)
case types.ETJson:
sig = &builtinCastJSONAsTimeSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastJsonAsTime)
case types.ETString:
sig = &builtinCastStringAsTimeSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastStringAsTime)
default:
panic("unsupported types.EvalType in castAsTimeFunctionClass")
}
return sig, nil
}
type castAsDurationFunctionClass struct {
baseFunctionClass
tp *types.FieldType
}
func (c *castAsDurationFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (sig builtinFunc, err error) {
if err := c.verifyArgs(args); err != nil {
return nil, errors.Trace(err)
}
bf := newBaseBuiltinFunc(ctx, args)
bf.tp = c.tp
argTp := args[0].GetType().EvalType()
switch argTp {
case types.ETInt:
sig = &builtinCastIntAsDurationSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastIntAsDuration)
case types.ETReal:
sig = &builtinCastRealAsDurationSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastRealAsDuration)
case types.ETDecimal:
sig = &builtinCastDecimalAsDurationSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDecimalAsDuration)
case types.ETDatetime, types.ETTimestamp:
sig = &builtinCastTimeAsDurationSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastTimeAsDuration)
case types.ETDuration:
sig = &builtinCastDurationAsDurationSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDurationAsDuration)
case types.ETJson:
sig = &builtinCastJSONAsDurationSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastJsonAsDuration)
case types.ETString:
sig = &builtinCastStringAsDurationSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastStringAsDuration)
default:
panic("unsupported types.EvalType in castAsDurationFunctionClass")
}
return sig, nil
}
type castAsJSONFunctionClass struct {
baseFunctionClass
tp *types.FieldType
}
func (c *castAsJSONFunctionClass) getFunction(ctx sessionctx.Context, args []Expression) (sig builtinFunc, err error) {
if err := c.verifyArgs(args); err != nil {
return nil, errors.Trace(err)
}
bf := newBaseBuiltinFunc(ctx, args)
bf.tp = c.tp
argTp := args[0].GetType().EvalType()
switch argTp {
case types.ETInt:
sig = &builtinCastIntAsJSONSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastIntAsJson)
case types.ETReal:
sig = &builtinCastRealAsJSONSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastRealAsJson)
case types.ETDecimal:
sig = &builtinCastDecimalAsJSONSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDecimalAsJson)
case types.ETDatetime, types.ETTimestamp:
sig = &builtinCastTimeAsJSONSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastTimeAsJson)
case types.ETDuration:
sig = &builtinCastDurationAsJSONSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastDurationAsJson)
case types.ETJson:
sig = &builtinCastJSONAsJSONSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_CastJsonAsJson)
case types.ETString:
sig = &builtinCastStringAsJSONSig{bf}
sig.getRetTp().Flag |= mysql.ParseToJSONFlag
sig.setPbCode(tipb.ScalarFuncSig_CastStringAsJson)
default:
panic("unsupported types.EvalType in castAsJSONFunctionClass")
}
return sig, nil
}
type builtinCastIntAsIntSig struct {
baseBuiltinFunc
}
func (b *builtinCastIntAsIntSig) Clone() builtinFunc {
newSig := &builtinCastIntAsIntSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastIntAsIntSig) evalInt(row types.Row) (res int64, isNull bool, err error) {
return b.args[0].EvalInt(b.ctx, row)
}
type builtinCastIntAsRealSig struct {
baseBuiltinFunc
}
func (b *builtinCastIntAsRealSig) Clone() builtinFunc {
newSig := &builtinCastIntAsRealSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastIntAsRealSig) evalReal(row types.Row) (res float64, isNull bool, err error) {
val, isNull, err := b.args[0].EvalInt(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
if !mysql.HasUnsignedFlag(b.args[0].GetType().Flag) {
res = float64(val)
} else {
var uVal uint64
uVal, err = types.ConvertIntToUint(val, types.UnsignedUpperBound[mysql.TypeLonglong], mysql.TypeLonglong)
res = float64(uVal)
}
return res, false, errors.Trace(err)
}
type builtinCastIntAsDecimalSig struct {
baseBuiltinFunc
}
func (b *builtinCastIntAsDecimalSig) Clone() builtinFunc {
newSig := &builtinCastIntAsDecimalSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastIntAsDecimalSig) evalDecimal(row types.Row) (res *types.MyDecimal, isNull bool, err error) {
val, isNull, err := b.args[0].EvalInt(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
if !mysql.HasUnsignedFlag(b.args[0].GetType().Flag) {
res = types.NewDecFromInt(val)
} else {
var uVal uint64
uVal, err = types.ConvertIntToUint(val, types.UnsignedUpperBound[mysql.TypeLonglong], mysql.TypeLonglong)
if err != nil {
return res, false, errors.Trace(err)
}
res = types.NewDecFromUint(uVal)
}
res, err = types.ProduceDecWithSpecifiedTp(res, b.tp, b.ctx.GetSessionVars().StmtCtx)
return res, isNull, errors.Trace(err)
}
type builtinCastIntAsStringSig struct {
baseBuiltinFunc
}
func (b *builtinCastIntAsStringSig) Clone() builtinFunc {
newSig := &builtinCastIntAsStringSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastIntAsStringSig) evalString(row types.Row) (res string, isNull bool, err error) {
val, isNull, err := b.args[0].EvalInt(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
if !mysql.HasUnsignedFlag(b.args[0].GetType().Flag) {
res = strconv.FormatInt(val, 10)
} else {
var uVal uint64
uVal, err = types.ConvertIntToUint(val, types.UnsignedUpperBound[mysql.TypeLonglong], mysql.TypeLonglong)
if err != nil {
return res, false, errors.Trace(err)
}
res = strconv.FormatUint(uVal, 10)
}
res, err = types.ProduceStrWithSpecifiedTp(res, b.tp, b.ctx.GetSessionVars().StmtCtx)
return res, false, errors.Trace(err)
}
type builtinCastIntAsTimeSig struct {
baseBuiltinFunc
}
func (b *builtinCastIntAsTimeSig) Clone() builtinFunc {
newSig := &builtinCastIntAsTimeSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastIntAsTimeSig) evalTime(row types.Row) (res types.Time, isNull bool, err error) {
val, isNull, err := b.args[0].EvalInt(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
res, err = types.ParseTimeFromNum(b.ctx.GetSessionVars().StmtCtx, val, b.tp.Tp, b.tp.Decimal)
if err != nil {
return res, true, errors.Trace(err)
}
if b.tp.Tp == mysql.TypeDate {
// Truncate hh:mm:ss part if the type is Date.
res.Time = types.FromDate(res.Time.Year(), res.Time.Month(), res.Time.Day(), 0, 0, 0, 0)
}
return res, false, nil
}
type builtinCastIntAsDurationSig struct {
baseBuiltinFunc
}
func (b *builtinCastIntAsDurationSig) Clone() builtinFunc {
newSig := &builtinCastIntAsDurationSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastIntAsDurationSig) evalDuration(row types.Row) (res types.Duration, isNull bool, err error) {
val, isNull, err := b.args[0].EvalInt(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
dur, err := types.NumberToDuration(val, b.tp.Decimal)
if err != nil {
if types.ErrOverflow.Equal(err) {
err = b.ctx.GetSessionVars().StmtCtx.HandleOverflow(err, err)
}
return res, true, errors.Trace(err)
}
return dur, false, errors.Trace(err)
}
type builtinCastIntAsJSONSig struct {
baseBuiltinFunc
}
func (b *builtinCastIntAsJSONSig) Clone() builtinFunc {
newSig := &builtinCastIntAsJSONSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastIntAsJSONSig) evalJSON(row types.Row) (res json.BinaryJSON, isNull bool, err error) {
val, isNull, err := b.args[0].EvalInt(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
if mysql.HasIsBooleanFlag(b.args[0].GetType().Flag) {
res = json.CreateBinary(val != 0)
} else if mysql.HasUnsignedFlag(b.args[0].GetType().Flag) {
res = json.CreateBinary(uint64(val))
} else {
res = json.CreateBinary(val)
}
return res, false, nil
}
type builtinCastRealAsJSONSig struct {
baseBuiltinFunc
}
func (b *builtinCastRealAsJSONSig) Clone() builtinFunc {
newSig := &builtinCastRealAsJSONSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastRealAsJSONSig) evalJSON(row types.Row) (res json.BinaryJSON, isNull bool, err error) {
val, isNull, err := b.args[0].EvalReal(b.ctx, row)
// FIXME: `select json_type(cast(1111.11 as json))` should return `DECIMAL`, we return `DOUBLE` now.
return json.CreateBinary(val), isNull, errors.Trace(err)
}
type builtinCastDecimalAsJSONSig struct {
baseBuiltinFunc
}
func (b *builtinCastDecimalAsJSONSig) Clone() builtinFunc {
newSig := &builtinCastDecimalAsJSONSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastDecimalAsJSONSig) evalJSON(row types.Row) (json.BinaryJSON, bool, error) {
val, isNull, err := b.args[0].EvalDecimal(b.ctx, row)
if isNull || err != nil {
return json.BinaryJSON{}, true, errors.Trace(err)
}
// FIXME: `select json_type(cast(1111.11 as json))` should return `DECIMAL`, we return `DOUBLE` now.
f64, err := val.ToFloat64()
if err != nil {
return json.BinaryJSON{}, true, errors.Trace(err)
}
return json.CreateBinary(f64), isNull, errors.Trace(err)
}
type builtinCastStringAsJSONSig struct {
baseBuiltinFunc
}
func (b *builtinCastStringAsJSONSig) Clone() builtinFunc {
newSig := &builtinCastStringAsJSONSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastStringAsJSONSig) evalJSON(row types.Row) (res json.BinaryJSON, isNull bool, err error) {
val, isNull, err := b.args[0].EvalString(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
if mysql.HasParseToJSONFlag(b.tp.Flag) {
res, err = json.ParseBinaryFromString(val)
} else {
res = json.CreateBinary(val)
}
return res, false, errors.Trace(err)
}
type builtinCastDurationAsJSONSig struct {
baseBuiltinFunc
}
func (b *builtinCastDurationAsJSONSig) Clone() builtinFunc {
newSig := &builtinCastDurationAsJSONSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastDurationAsJSONSig) evalJSON(row types.Row) (res json.BinaryJSON, isNull bool, err error) {
val, isNull, err := b.args[0].EvalDuration(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
val.Fsp = types.MaxFsp
return json.CreateBinary(val.String()), false, nil
}
type builtinCastTimeAsJSONSig struct {
baseBuiltinFunc
}
func (b *builtinCastTimeAsJSONSig) Clone() builtinFunc {
newSig := &builtinCastTimeAsJSONSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastTimeAsJSONSig) evalJSON(row types.Row) (res json.BinaryJSON, isNull bool, err error) {
val, isNull, err := b.args[0].EvalTime(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
if val.Type == mysql.TypeDatetime || val.Type == mysql.TypeTimestamp {
val.Fsp = types.MaxFsp
}
return json.CreateBinary(val.String()), false, nil
}
type builtinCastRealAsRealSig struct {
baseBuiltinFunc
}
func (b *builtinCastRealAsRealSig) Clone() builtinFunc {
newSig := &builtinCastRealAsRealSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastRealAsRealSig) evalReal(row types.Row) (res float64, isNull bool, err error) {
return b.args[0].EvalReal(b.ctx, row)
}
type builtinCastRealAsIntSig struct {
baseBuiltinFunc
}
func (b *builtinCastRealAsIntSig) Clone() builtinFunc {
newSig := &builtinCastRealAsIntSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastRealAsIntSig) evalInt(row types.Row) (res int64, isNull bool, err error) {
val, isNull, err := b.args[0].EvalReal(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
if !mysql.HasUnsignedFlag(b.tp.Flag) {
res, err = types.ConvertFloatToInt(val, types.SignedLowerBound[mysql.TypeLonglong], types.SignedUpperBound[mysql.TypeLonglong], mysql.TypeDouble)
} else {
var uintVal uint64
uintVal, err = types.ConvertFloatToUint(val, types.UnsignedUpperBound[mysql.TypeLonglong], mysql.TypeDouble)
res = int64(uintVal)
}
return res, isNull, errors.Trace(err)
}
type builtinCastRealAsDecimalSig struct {
baseBuiltinFunc
}
func (b *builtinCastRealAsDecimalSig) Clone() builtinFunc {
newSig := &builtinCastRealAsDecimalSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastRealAsDecimalSig) evalDecimal(row types.Row) (res *types.MyDecimal, isNull bool, err error) {
val, isNull, err := b.args[0].EvalReal(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
res = new(types.MyDecimal)
err = res.FromFloat64(val)
if err != nil {
return res, false, errors.Trace(err)
}
res, err = types.ProduceDecWithSpecifiedTp(res, b.tp, b.ctx.GetSessionVars().StmtCtx)
return res, false, errors.Trace(err)
}
type builtinCastRealAsStringSig struct {
baseBuiltinFunc
}
func (b *builtinCastRealAsStringSig) Clone() builtinFunc {
newSig := &builtinCastRealAsStringSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastRealAsStringSig) evalString(row types.Row) (res string, isNull bool, err error) {
val, isNull, err := b.args[0].EvalReal(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
res, err = types.ProduceStrWithSpecifiedTp(strconv.FormatFloat(val, 'f', -1, 64), b.tp, b.ctx.GetSessionVars().StmtCtx)
return res, isNull, errors.Trace(err)
}
type builtinCastRealAsTimeSig struct {
baseBuiltinFunc
}
func (b *builtinCastRealAsTimeSig) Clone() builtinFunc {
newSig := &builtinCastRealAsTimeSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastRealAsTimeSig) evalTime(row types.Row) (types.Time, bool, error) {
val, isNull, err := b.args[0].EvalReal(b.ctx, row)
if isNull || err != nil {
return types.Time{}, true, errors.Trace(err)
}
sc := b.ctx.GetSessionVars().StmtCtx
res, err := types.ParseTime(sc, strconv.FormatFloat(val, 'f', -1, 64), b.tp.Tp, b.tp.Decimal)
if err != nil {
return types.Time{}, true, errors.Trace(err)
}
if b.tp.Tp == mysql.TypeDate {
// Truncate hh:mm:ss part if the type is Date.
res.Time = types.FromDate(res.Time.Year(), res.Time.Month(), res.Time.Day(), 0, 0, 0, 0)
}
return res, false, nil
}
type builtinCastRealAsDurationSig struct {
baseBuiltinFunc
}
func (b *builtinCastRealAsDurationSig) Clone() builtinFunc {
newSig := &builtinCastRealAsDurationSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastRealAsDurationSig) evalDuration(row types.Row) (res types.Duration, isNull bool, err error) {
val, isNull, err := b.args[0].EvalReal(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
res, err = types.ParseDuration(strconv.FormatFloat(val, 'f', -1, 64), b.tp.Decimal)
return res, false, errors.Trace(err)
}
type builtinCastDecimalAsDecimalSig struct {
baseBuiltinFunc
}
func (b *builtinCastDecimalAsDecimalSig) Clone() builtinFunc {
newSig := &builtinCastDecimalAsDecimalSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastDecimalAsDecimalSig) evalDecimal(row types.Row) (res *types.MyDecimal, isNull bool, err error) {
evalDecimal, isNull, err := b.args[0].EvalDecimal(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
res = &types.MyDecimal{}
*res = *evalDecimal
sc := b.ctx.GetSessionVars().StmtCtx
res, err = types.ProduceDecWithSpecifiedTp(res, b.tp, sc)
return res, false, errors.Trace(err)
}
type builtinCastDecimalAsIntSig struct {
baseBuiltinFunc
}
func (b *builtinCastDecimalAsIntSig) Clone() builtinFunc {
newSig := &builtinCastDecimalAsIntSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastDecimalAsIntSig) evalInt(row types.Row) (res int64, isNull bool, err error) {
val, isNull, err := b.args[0].EvalDecimal(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
// Round is needed for both unsigned and signed.
var to types.MyDecimal
err = val.Round(&to, 0, types.ModeHalfEven)
if err != nil {
return 0, true, errors.Trace(err)
}
if mysql.HasUnsignedFlag(b.tp.Flag) {
var uintRes uint64
uintRes, err = to.ToUint()
res = int64(uintRes)
} else {
res, err = to.ToInt()
}
if types.ErrOverflow.Equal(err) {
warnErr := types.ErrTruncatedWrongVal.GenByArgs("DECIMAL", val)
err = b.ctx.GetSessionVars().StmtCtx.HandleOverflow(err, warnErr)
}
return res, false, errors.Trace(err)
}
type builtinCastDecimalAsStringSig struct {
baseBuiltinFunc
}
func (b *builtinCastDecimalAsStringSig) Clone() builtinFunc {
newSig := &builtinCastDecimalAsStringSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastDecimalAsStringSig) evalString(row types.Row) (res string, isNull bool, err error) {
val, isNull, err := b.args[0].EvalDecimal(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
sc := b.ctx.GetSessionVars().StmtCtx
res, err = types.ProduceStrWithSpecifiedTp(string(val.ToString()), b.tp, sc)
return res, false, errors.Trace(err)
}
type builtinCastDecimalAsRealSig struct {
baseBuiltinFunc
}
func (b *builtinCastDecimalAsRealSig) Clone() builtinFunc {
newSig := &builtinCastDecimalAsRealSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastDecimalAsRealSig) evalReal(row types.Row) (res float64, isNull bool, err error) {
val, isNull, err := b.args[0].EvalDecimal(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
res, err = val.ToFloat64()
return res, false, errors.Trace(err)
}
type builtinCastDecimalAsTimeSig struct {
baseBuiltinFunc
}
func (b *builtinCastDecimalAsTimeSig) Clone() builtinFunc {
newSig := &builtinCastDecimalAsTimeSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastDecimalAsTimeSig) evalTime(row types.Row) (res types.Time, isNull bool, err error) {
val, isNull, err := b.args[0].EvalDecimal(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
sc := b.ctx.GetSessionVars().StmtCtx
res, err = types.ParseTime(sc, string(val.ToString()), b.tp.Tp, b.tp.Decimal)
if err != nil {
return res, false, errors.Trace(err)
}
if b.tp.Tp == mysql.TypeDate {
// Truncate hh:mm:ss part if the type is Date.
res.Time = types.FromDate(res.Time.Year(), res.Time.Month(), res.Time.Day(), 0, 0, 0, 0)
}
return res, false, errors.Trace(err)
}
type builtinCastDecimalAsDurationSig struct {
baseBuiltinFunc
}
func (b *builtinCastDecimalAsDurationSig) Clone() builtinFunc {
newSig := &builtinCastDecimalAsDurationSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastDecimalAsDurationSig) evalDuration(row types.Row) (res types.Duration, isNull bool, err error) {
val, isNull, err := b.args[0].EvalDecimal(b.ctx, row)
if isNull || err != nil {
return res, false, errors.Trace(err)
}
res, err = types.ParseDuration(string(val.ToString()), b.tp.Decimal)
if types.ErrTruncatedWrongVal.Equal(err) {
err = b.ctx.GetSessionVars().StmtCtx.HandleTruncate(err)
// ZeroDuration of error ErrTruncatedWrongVal needs to be considered NULL.
if res == types.ZeroDuration {
return res, true, errors.Trace(err)
}
}
return res, false, errors.Trace(err)
}
type builtinCastStringAsStringSig struct {
baseBuiltinFunc
}
func (b *builtinCastStringAsStringSig) Clone() builtinFunc {
newSig := &builtinCastStringAsStringSig{}
newSig.cloneFrom(&b.baseBuiltinFunc)
return newSig
}
func (b *builtinCastStringAsStringSig) evalString(row types.Row) (res string, isNull bool, err error) {
res, isNull, err = b.args[0].EvalString(b.ctx, row)
if isNull || err != nil {
return res, isNull, errors.Trace(err)
}
sc := b.ctx.GetSessionVars().StmtCtx
res, err = types.ProduceStrWithSpecifiedTp(res, b.tp, sc)
return res, false, errors.Trace(err)