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datum.go
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datum.go
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// Copyright 2016 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.
package types
import (
"fmt"
"math"
"sort"
"strconv"
"strings"
"time"
"github.com/juju/errors"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/util/charset"
"github.com/pingcap/tidb/util/hack"
"github.com/pingcap/tidb/util/types/json"
)
// Kind constants.
const (
KindNull byte = 0
KindInt64 byte = 1
KindUint64 byte = 2
KindFloat32 byte = 3
KindFloat64 byte = 4
KindString byte = 5
KindBytes byte = 6
KindBinaryLiteral byte = 7 // Used for BIT / HEX literals.
KindMysqlDecimal byte = 8
KindMysqlDuration byte = 9
KindMysqlEnum byte = 10
KindMysqlBit byte = 11 // Used for BIT table column values.
KindMysqlSet byte = 12
KindMysqlTime byte = 13
KindInterface byte = 14
KindMinNotNull byte = 15
KindMaxValue byte = 16
KindRaw byte = 17
KindMysqlJSON byte = 18
)
// Datum is a data box holds different kind of data.
// It has better performance and is easier to use than `interface{}`.
type Datum struct {
k byte // datum kind.
collation uint8 // collation can hold uint8 values.
decimal uint16 // decimal can hold uint16 values.
length uint32 // length can hold uint32 values.
i int64 // i can hold int64 uint64 float64 values.
b []byte // b can hold string or []byte values.
x interface{} // x hold all other types.
}
// Kind gets the kind of the datum.
func (d *Datum) Kind() byte {
return d.k
}
// Collation gets the collation of the datum.
func (d *Datum) Collation() byte {
return d.collation
}
// SetCollation sets the collation of the datum.
func (d *Datum) SetCollation(collation byte) {
d.collation = collation
}
// Frac gets the frac of the datum.
func (d *Datum) Frac() int {
return int(d.decimal)
}
// SetFrac sets the frac of the datum.
func (d *Datum) SetFrac(frac int) {
d.decimal = uint16(frac)
}
// Length gets the length of the datum.
func (d *Datum) Length() int {
return int(d.length)
}
// SetLength sets the length of the datum
func (d *Datum) SetLength(l int) {
d.length = uint32(l)
}
// IsNull checks if datum is null.
func (d *Datum) IsNull() bool {
return d.k == KindNull
}
// GetInt64 gets int64 value.
func (d *Datum) GetInt64() int64 {
return d.i
}
// SetInt64 sets int64 value.
func (d *Datum) SetInt64(i int64) {
d.k = KindInt64
d.i = i
}
// GetUint64 gets uint64 value.
func (d *Datum) GetUint64() uint64 {
return uint64(d.i)
}
// SetUint64 sets uint64 value.
func (d *Datum) SetUint64(i uint64) {
d.k = KindUint64
d.i = int64(i)
}
// GetFloat64 gets float64 value.
func (d *Datum) GetFloat64() float64 {
return math.Float64frombits(uint64(d.i))
}
// SetFloat64 sets float64 value.
func (d *Datum) SetFloat64(f float64) {
d.k = KindFloat64
d.i = int64(math.Float64bits(f))
}
// GetFloat32 gets float32 value.
func (d *Datum) GetFloat32() float32 {
return float32(math.Float64frombits(uint64(d.i)))
}
// SetFloat32 sets float32 value.
func (d *Datum) SetFloat32(f float32) {
d.k = KindFloat32
d.i = int64(math.Float64bits(float64(f)))
}
// GetString gets string value.
func (d *Datum) GetString() string {
return hack.String(d.b)
}
// SetString sets string value.
func (d *Datum) SetString(s string) {
d.k = KindString
sink(s)
d.b = hack.Slice(s)
}
// sink prevents s from being allocated on the stack.
var sink = func(s string) {
}
// GetBytes gets bytes value.
func (d *Datum) GetBytes() []byte {
return d.b
}
// SetBytes sets bytes value to datum.
func (d *Datum) SetBytes(b []byte) {
d.k = KindBytes
d.b = b
}
// SetBytesAsString sets bytes value to datum as string type.
func (d *Datum) SetBytesAsString(b []byte) {
d.k = KindString
d.b = b
}
// GetInterface gets interface value.
func (d *Datum) GetInterface() interface{} {
return d.x
}
// SetInterface sets interface to datum.
func (d *Datum) SetInterface(x interface{}) {
d.k = KindInterface
d.x = x
}
// SetNull sets datum to nil.
func (d *Datum) SetNull() {
d.k = KindNull
d.x = nil
}
// GetBinaryLiteral gets Bit value
func (d *Datum) GetBinaryLiteral() BinaryLiteral {
return d.b
}
// GetMysqlBit gets MysqlBit value
func (d *Datum) GetMysqlBit() BinaryLiteral {
return d.GetBinaryLiteral()
}
// SetBinaryLiteral sets Bit value
func (d *Datum) SetBinaryLiteral(b BinaryLiteral) {
d.k = KindBinaryLiteral
d.b = b
}
// SetMysqlBit sets MysqlBit value
func (d *Datum) SetMysqlBit(b BinaryLiteral) {
d.k = KindMysqlBit
d.b = b
}
// GetMysqlDecimal gets Decimal value
func (d *Datum) GetMysqlDecimal() *MyDecimal {
return d.x.(*MyDecimal)
}
// SetMysqlDecimal sets Decimal value
func (d *Datum) SetMysqlDecimal(b *MyDecimal) {
d.k = KindMysqlDecimal
d.x = b
}
// GetMysqlDuration gets Duration value
func (d *Datum) GetMysqlDuration() Duration {
return Duration{Duration: time.Duration(d.i), Fsp: int(d.decimal)}
}
// SetMysqlDuration sets Duration value
func (d *Datum) SetMysqlDuration(b Duration) {
d.k = KindMysqlDuration
d.i = int64(b.Duration)
d.decimal = uint16(b.Fsp)
}
// GetMysqlEnum gets Enum value
func (d *Datum) GetMysqlEnum() Enum {
return Enum{Value: uint64(d.i), Name: hack.String(d.b)}
}
// SetMysqlEnum sets Enum value
func (d *Datum) SetMysqlEnum(b Enum) {
d.k = KindMysqlEnum
d.i = int64(b.Value)
sink(b.Name)
d.b = hack.Slice(b.Name)
}
// GetMysqlSet gets Set value
func (d *Datum) GetMysqlSet() Set {
return Set{Value: uint64(d.i), Name: hack.String(d.b)}
}
// SetMysqlSet sets Set value
func (d *Datum) SetMysqlSet(b Set) {
d.k = KindMysqlSet
d.i = int64(b.Value)
sink(b.Name)
d.b = hack.Slice(b.Name)
}
// GetMysqlJSON gets json.JSON value
func (d *Datum) GetMysqlJSON() json.JSON {
return d.x.(json.JSON)
}
// SetMysqlJSON sets json.JSON value
func (d *Datum) SetMysqlJSON(b json.JSON) {
d.k = KindMysqlJSON
d.x = b
}
// GetMysqlTime gets types.Time value
func (d *Datum) GetMysqlTime() Time {
return d.x.(Time)
}
// SetMysqlTime sets types.Time value
func (d *Datum) SetMysqlTime(b Time) {
d.k = KindMysqlTime
d.x = b
}
// SetRaw sets raw value.
func (d *Datum) SetRaw(b []byte) {
d.k = KindRaw
d.b = b
}
// GetRaw gets raw value.
func (d *Datum) GetRaw() []byte {
return d.b
}
// GetValue gets the value of the datum of any kind.
func (d *Datum) GetValue() interface{} {
switch d.k {
case KindInt64:
return d.GetInt64()
case KindUint64:
return d.GetUint64()
case KindFloat32:
return d.GetFloat32()
case KindFloat64:
return d.GetFloat64()
case KindString:
return d.GetString()
case KindBytes:
return d.GetBytes()
case KindMysqlDecimal:
return d.GetMysqlDecimal()
case KindMysqlDuration:
return d.GetMysqlDuration()
case KindMysqlEnum:
return d.GetMysqlEnum()
case KindBinaryLiteral, KindMysqlBit:
return d.GetBinaryLiteral()
case KindMysqlSet:
return d.GetMysqlSet()
case KindMysqlJSON:
return d.GetMysqlJSON()
case KindMysqlTime:
return d.GetMysqlTime()
default:
return d.GetInterface()
}
}
// SetValue sets any kind of value.
func (d *Datum) SetValue(val interface{}) {
switch x := val.(type) {
case nil:
d.SetNull()
case bool:
if x {
d.SetInt64(1)
} else {
d.SetInt64(0)
}
case int:
d.SetInt64(int64(x))
case int64:
d.SetInt64(x)
case uint64:
d.SetUint64(x)
case float32:
d.SetFloat32(x)
case float64:
d.SetFloat64(x)
case string:
d.SetString(x)
case []byte:
d.SetBytes(x)
case *MyDecimal:
d.SetMysqlDecimal(x)
case Duration:
d.SetMysqlDuration(x)
case Enum:
d.SetMysqlEnum(x)
case BinaryLiteral:
d.SetBinaryLiteral(x)
case BitLiteral: // Store as BinaryLiteral for Bit and Hex literals
d.SetBinaryLiteral(BinaryLiteral(x))
case HexLiteral:
d.SetBinaryLiteral(BinaryLiteral(x))
case Set:
d.SetMysqlSet(x)
case json.JSON:
d.SetMysqlJSON(x)
case Time:
d.SetMysqlTime(x)
default:
d.SetInterface(x)
}
}
// CompareDatum compares datum to another datum.
// TODO: return error properly.
func (d *Datum) CompareDatum(sc *variable.StatementContext, ad *Datum) (int, error) {
if d.k == KindMysqlJSON && ad.k != KindMysqlJSON {
cmp, err := ad.CompareDatum(sc, d)
return cmp * -1, errors.Trace(err)
}
switch ad.k {
case KindNull:
if d.k == KindNull {
return 0, nil
}
return 1, nil
case KindMinNotNull:
if d.k == KindNull {
return -1, nil
} else if d.k == KindMinNotNull {
return 0, nil
}
return 1, nil
case KindMaxValue:
if d.k == KindMaxValue {
return 0, nil
}
return -1, nil
case KindInt64:
return d.compareInt64(sc, ad.GetInt64())
case KindUint64:
return d.compareUint64(sc, ad.GetUint64())
case KindFloat32, KindFloat64:
return d.compareFloat64(sc, ad.GetFloat64())
case KindString:
return d.compareString(sc, ad.GetString())
case KindBytes:
return d.compareBytes(sc, ad.GetBytes())
case KindMysqlDecimal:
return d.compareMysqlDecimal(sc, ad.GetMysqlDecimal())
case KindMysqlDuration:
return d.compareMysqlDuration(sc, ad.GetMysqlDuration())
case KindMysqlEnum:
return d.compareMysqlEnum(sc, ad.GetMysqlEnum())
case KindBinaryLiteral, KindMysqlBit:
return d.compareBinaryLiteral(sc, ad.GetBinaryLiteral())
case KindMysqlSet:
return d.compareMysqlSet(sc, ad.GetMysqlSet())
case KindMysqlJSON:
return d.compareMysqlJSON(sc, ad.GetMysqlJSON())
case KindMysqlTime:
return d.compareMysqlTime(sc, ad.GetMysqlTime())
default:
return 0, nil
}
}
func (d *Datum) compareInt64(sc *variable.StatementContext, i int64) (int, error) {
switch d.k {
case KindMaxValue:
return 1, nil
case KindInt64:
return CompareInt64(d.i, i), nil
case KindUint64:
if i < 0 || d.GetUint64() > math.MaxInt64 {
return 1, nil
}
return CompareInt64(d.i, i), nil
default:
return d.compareFloat64(sc, float64(i))
}
}
func (d *Datum) compareUint64(sc *variable.StatementContext, u uint64) (int, error) {
switch d.k {
case KindMaxValue:
return 1, nil
case KindInt64:
if d.i < 0 || u > math.MaxInt64 {
return -1, nil
}
return CompareInt64(d.i, int64(u)), nil
case KindUint64:
return CompareUint64(d.GetUint64(), u), nil
default:
return d.compareFloat64(sc, float64(u))
}
}
func (d *Datum) compareFloat64(sc *variable.StatementContext, f float64) (int, error) {
switch d.k {
case KindNull, KindMinNotNull:
return -1, nil
case KindMaxValue:
return 1, nil
case KindInt64:
return CompareFloat64(float64(d.i), f), nil
case KindUint64:
return CompareFloat64(float64(d.GetUint64()), f), nil
case KindFloat32, KindFloat64:
return CompareFloat64(d.GetFloat64(), f), nil
case KindString, KindBytes:
fVal, err := StrToFloat(sc, d.GetString())
return CompareFloat64(fVal, f), err
case KindMysqlDecimal:
fVal, err := d.GetMysqlDecimal().ToFloat64()
return CompareFloat64(fVal, f), err
case KindMysqlDuration:
fVal := d.GetMysqlDuration().Seconds()
return CompareFloat64(fVal, f), nil
case KindMysqlEnum:
fVal := d.GetMysqlEnum().ToNumber()
return CompareFloat64(fVal, f), nil
case KindBinaryLiteral, KindMysqlBit:
val, err := d.GetBinaryLiteral().ToInt()
fVal := float64(val)
return CompareFloat64(fVal, f), err
case KindMysqlSet:
fVal := d.GetMysqlSet().ToNumber()
return CompareFloat64(fVal, f), nil
case KindMysqlTime:
fVal, err := d.GetMysqlTime().ToNumber().ToFloat64()
return CompareFloat64(fVal, f), err
default:
return -1, nil
}
}
func (d *Datum) compareString(sc *variable.StatementContext, s string) (int, error) {
switch d.k {
case KindNull, KindMinNotNull:
return -1, nil
case KindMaxValue:
return 1, nil
case KindString, KindBytes:
return CompareString(d.GetString(), s), nil
case KindMysqlDecimal:
dec := new(MyDecimal)
err := sc.HandleTruncate(dec.FromString(hack.Slice(s)))
return d.GetMysqlDecimal().Compare(dec), err
case KindMysqlTime:
dt, err := ParseDatetime(sc, s)
return d.GetMysqlTime().Compare(dt), err
case KindMysqlDuration:
dur, err := ParseDuration(s, MaxFsp)
return d.GetMysqlDuration().Compare(dur), err
case KindMysqlSet:
return CompareString(d.GetMysqlSet().String(), s), nil
case KindMysqlEnum:
return CompareString(d.GetMysqlEnum().String(), s), nil
case KindBinaryLiteral, KindMysqlBit:
return CompareString(d.GetBinaryLiteral().ToString(), s), nil
default:
fVal, err := StrToFloat(sc, s)
if err != nil {
return 0, err
}
return d.compareFloat64(sc, fVal)
}
}
func (d *Datum) compareBytes(sc *variable.StatementContext, b []byte) (int, error) {
return d.compareString(sc, hack.String(b))
}
func (d *Datum) compareMysqlDecimal(sc *variable.StatementContext, dec *MyDecimal) (int, error) {
switch d.k {
case KindMysqlDecimal:
return d.GetMysqlDecimal().Compare(dec), nil
case KindString, KindBytes:
dDec := new(MyDecimal)
err := sc.HandleTruncate(dDec.FromString(d.GetBytes()))
return dDec.Compare(dec), err
default:
fVal, err := dec.ToFloat64()
if err != nil {
return 0, errors.Trace(err)
}
return d.compareFloat64(sc, fVal)
}
}
func (d *Datum) compareMysqlDuration(sc *variable.StatementContext, dur Duration) (int, error) {
switch d.k {
case KindMysqlDuration:
return d.GetMysqlDuration().Compare(dur), nil
case KindString, KindBytes:
dDur, err := ParseDuration(d.GetString(), MaxFsp)
return dDur.Compare(dur), err
default:
return d.compareFloat64(sc, dur.Seconds())
}
}
func (d *Datum) compareMysqlEnum(sc *variable.StatementContext, enum Enum) (int, error) {
switch d.k {
case KindString, KindBytes:
return CompareString(d.GetString(), enum.String()), nil
default:
return d.compareFloat64(sc, enum.ToNumber())
}
}
func (d *Datum) compareBinaryLiteral(sc *variable.StatementContext, b BinaryLiteral) (int, error) {
switch d.k {
case KindString, KindBytes:
return CompareString(d.GetString(), b.ToString()), nil
case KindBinaryLiteral, KindMysqlBit:
return CompareString(d.GetBinaryLiteral().ToString(), b.ToString()), nil
default:
val, err := b.ToInt()
if err != nil {
return 0, errors.Trace(err)
}
result, err := d.compareFloat64(sc, float64(val))
return result, errors.Trace(err)
}
}
func (d *Datum) compareMysqlSet(sc *variable.StatementContext, set Set) (int, error) {
switch d.k {
case KindString, KindBytes:
return CompareString(d.GetString(), set.String()), nil
default:
return d.compareFloat64(sc, set.ToNumber())
}
}
func (d *Datum) compareMysqlJSON(sc *variable.StatementContext, target json.JSON) (int, error) {
origin, err := d.ToMysqlJSON()
if err != nil {
return 0, errors.Trace(err)
}
return json.CompareJSON(origin, target)
}
func (d *Datum) compareMysqlTime(sc *variable.StatementContext, time Time) (int, error) {
switch d.k {
case KindString, KindBytes:
dt, err := ParseDatetime(sc, d.GetString())
return dt.Compare(time), err
case KindMysqlTime:
return d.GetMysqlTime().Compare(time), nil
default:
fVal, err := time.ToNumber().ToFloat64()
if err != nil {
return 0, errors.Trace(err)
}
return d.compareFloat64(sc, fVal)
}
}
// ConvertTo converts a datum to the target field type.
func (d *Datum) ConvertTo(sc *variable.StatementContext, target *FieldType) (Datum, error) {
if d.k == KindNull {
return Datum{}, nil
}
switch target.Tp { // TODO: implement mysql types convert when "CAST() AS" syntax are supported.
case mysql.TypeTiny, mysql.TypeShort, mysql.TypeInt24, mysql.TypeLong, mysql.TypeLonglong:
unsigned := mysql.HasUnsignedFlag(target.Flag)
if unsigned {
return d.convertToUint(sc, target)
}
return d.convertToInt(sc, target)
case mysql.TypeFloat, mysql.TypeDouble:
return d.convertToFloat(sc, target)
case mysql.TypeBlob, mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob,
mysql.TypeString, mysql.TypeVarchar, mysql.TypeVarString:
return d.convertToString(sc, target)
case mysql.TypeTimestamp:
return d.convertToMysqlTimestamp(sc, target)
case mysql.TypeDatetime, mysql.TypeDate, mysql.TypeNewDate:
return d.convertToMysqlTime(sc, target)
case mysql.TypeDuration:
return d.convertToMysqlDuration(sc, target)
case mysql.TypeNewDecimal:
return d.convertToMysqlDecimal(sc, target)
case mysql.TypeYear:
return d.convertToMysqlYear(sc, target)
case mysql.TypeEnum:
return d.convertToMysqlEnum(sc, target)
case mysql.TypeBit:
return d.convertToMysqlBit(sc, target)
case mysql.TypeSet:
return d.convertToMysqlSet(sc, target)
case mysql.TypeJSON:
return d.convertToMysqlJSON(sc, target)
case mysql.TypeNull:
return Datum{}, nil
default:
panic("should never happen")
}
}
func (d *Datum) convertToFloat(sc *variable.StatementContext, target *FieldType) (Datum, error) {
var (
f float64
ret Datum
err error
)
switch d.k {
case KindNull:
return ret, nil
case KindInt64:
f = float64(d.GetInt64())
case KindUint64:
f = float64(d.GetUint64())
case KindFloat32, KindFloat64:
f = d.GetFloat64()
case KindString, KindBytes:
f, err = StrToFloat(sc, d.GetString())
case KindMysqlTime:
f, err = d.GetMysqlTime().ToNumber().ToFloat64()
case KindMysqlDuration:
f, err = d.GetMysqlDuration().ToNumber().ToFloat64()
case KindMysqlDecimal:
f, err = d.GetMysqlDecimal().ToFloat64()
case KindMysqlSet:
f = d.GetMysqlSet().ToNumber()
case KindMysqlEnum:
f = d.GetMysqlEnum().ToNumber()
case KindBinaryLiteral, KindMysqlBit:
val, err1 := d.GetBinaryLiteral().ToInt()
f, err = float64(val), err1
case KindMysqlJSON:
f, err = ConvertJSONToFloat(sc, d.GetMysqlJSON())
default:
return invalidConv(d, target.Tp)
}
var err1 error
f, err1 = ProduceFloatWithSpecifiedTp(f, target, sc)
if err == nil && err1 != nil {
err = err1
}
if target.Tp == mysql.TypeFloat {
ret.SetFloat32(float32(f))
} else {
ret.SetFloat64(f)
}
return ret, errors.Trace(err)
}
// ProduceFloatWithSpecifiedTp produces a new float64 according to `flen` and `decimal`.
func ProduceFloatWithSpecifiedTp(f float64, target *FieldType, sc *variable.StatementContext) (_ float64, err error) {
// For float and following double type, we will only truncate it for float(M, D) format.
// If no D is set, we will handle it like origin float whether M is set or not.
if target.Flen != UnspecifiedLength && target.Decimal != UnspecifiedLength {
f, err = TruncateFloat(f, target.Flen, target.Decimal)
err = sc.HandleOverflow(err, err)
}
return f, errors.Trace(err)
}
func (d *Datum) convertToString(sc *variable.StatementContext, target *FieldType) (Datum, error) {
var ret Datum
var s string
switch d.k {
case KindInt64:
s = strconv.FormatInt(d.GetInt64(), 10)
case KindUint64:
s = strconv.FormatUint(d.GetUint64(), 10)
case KindFloat32:
s = strconv.FormatFloat(d.GetFloat64(), 'f', -1, 32)
case KindFloat64:
s = strconv.FormatFloat(d.GetFloat64(), 'f', -1, 64)
case KindString, KindBytes:
s = d.GetString()
case KindMysqlTime:
s = d.GetMysqlTime().String()
case KindMysqlDuration:
s = d.GetMysqlDuration().String()
case KindMysqlDecimal:
s = d.GetMysqlDecimal().String()
case KindMysqlEnum:
s = d.GetMysqlEnum().String()
case KindMysqlSet:
s = d.GetMysqlSet().String()
case KindBinaryLiteral, KindMysqlBit:
s = d.GetBinaryLiteral().ToString()
case KindMysqlJSON:
s = d.GetMysqlJSON().String()
default:
return invalidConv(d, target.Tp)
}
s, err := ProduceStrWithSpecifiedTp(s, target, sc)
ret.SetString(s)
if target.Charset == charset.CharsetBin {
ret.k = KindBytes
}
return ret, errors.Trace(err)
}
// ProduceStrWithSpecifiedTp produces a new string according to `flen` and `chs`.
func ProduceStrWithSpecifiedTp(s string, tp *FieldType, sc *variable.StatementContext) (_ string, err error) {
flen, chs := tp.Flen, tp.Charset
if flen >= 0 {
// Flen is the rune length, not binary length, for UTF8 charset, we need to calculate the
// rune count and truncate to Flen runes if it is too long.
if chs == charset.CharsetUTF8 || chs == charset.CharsetUTF8MB4 {
if len([]rune(s)) > flen {
// 1. If len(s) is 0 and flen is 0, truncateLen will be 0, don't truncate s.
// CREATE TABLE t (a char(0));
// INSERT INTO t VALUES (``);
// 2. If len(s) is 10 and flen is 0, truncateLen will be 0 too, but we still need to truncate s.
// SELECT 1, CAST(1234 AS CHAR(0));
// So truncateLen is not a suitable variable to determine to do truncate or not.
var runeCount int
var truncateLen int
for i := range s {
if runeCount == flen {
// We don't break here because we need to iterate to the end to get runeCount.
truncateLen = i
}
runeCount++
}
err = ErrDataTooLong.Gen("Data Too Long, field len %d, data len %d", flen, runeCount)
s = truncateStr(s, truncateLen)
}
} else if len(s) > flen {
err = ErrDataTooLong.Gen("Data Too Long, field len %d, data len %d", flen, len(s))
s = truncateStr(s, flen)
} else if tp.Tp == mysql.TypeString && len(s) < flen {
padding := make([]byte, flen-len(s))
s = string(append([]byte(s), padding...))
}
}
return s, errors.Trace(sc.HandleTruncate(err))
}
func (d *Datum) convertToInt(sc *variable.StatementContext, target *FieldType) (Datum, error) {
i64, err := d.toSignedInteger(sc, target.Tp)
return NewIntDatum(i64), errors.Trace(err)
}
func (d *Datum) convertToUint(sc *variable.StatementContext, target *FieldType) (Datum, error) {
tp := target.Tp
upperBound := UnsignedUpperBound[tp]
var (
val uint64
err error
ret Datum
)
switch d.k {
case KindInt64:
val, err = ConvertIntToUint(d.GetInt64(), upperBound, tp)
case KindUint64:
val, err = ConvertUintToUint(d.GetUint64(), upperBound, tp)
case KindFloat32, KindFloat64:
val, err = ConvertFloatToUint(sc, d.GetFloat64(), upperBound, tp)
case KindString, KindBytes:
val, err = StrToUint(sc, d.GetString())
if err != nil {
return ret, errors.Trace(err)
}
val, err = ConvertUintToUint(val, upperBound, tp)
if err != nil {
return ret, errors.Trace(err)
}
ret.SetUint64(val)
case KindMysqlTime:
dec := d.GetMysqlTime().ToNumber()
err = dec.Round(dec, 0, ModeHalfEven)
ival, err1 := dec.ToInt()
if err == nil {
err = err1
}
val, err1 = ConvertIntToUint(ival, upperBound, tp)
if err == nil {
err = err1
}
case KindMysqlDuration:
dec := d.GetMysqlDuration().ToNumber()
err = dec.Round(dec, 0, ModeHalfEven)
ival, err1 := dec.ToInt()
if err1 == nil {
val, err = ConvertIntToUint(ival, upperBound, tp)
}
case KindMysqlDecimal:
fval, err1 := d.GetMysqlDecimal().ToFloat64()
val, err = ConvertFloatToUint(sc, fval, upperBound, tp)
if err == nil {
err = err1
}
case KindMysqlEnum:
val, err = ConvertFloatToUint(sc, d.GetMysqlEnum().ToNumber(), upperBound, tp)
case KindMysqlSet:
val, err = ConvertFloatToUint(sc, d.GetMysqlSet().ToNumber(), upperBound, tp)
case KindBinaryLiteral, KindMysqlBit:
val, err = d.GetBinaryLiteral().ToInt()
case KindMysqlJSON:
var i64 int64
i64, err = ConvertJSONToInt(sc, d.GetMysqlJSON(), true)
val = uint64(i64)
default:
return invalidConv(d, target.Tp)
}
ret.SetUint64(val)
if err != nil {
return ret, errors.Trace(err)
}
return ret, nil
}
func (d *Datum) convertToMysqlTimestamp(sc *variable.StatementContext, target *FieldType) (Datum, error) {
var (
ret Datum
t Time
err error
)
fsp := DefaultFsp
if target.Decimal != UnspecifiedLength {
fsp = target.Decimal
}
loc := sc.TimeZone
switch d.k {
case KindMysqlTime:
t = d.GetMysqlTime()
if t.Type == mysql.TypeTimestamp {
switch {
case t.TimeZone == nil:
t.TimeZone = loc
case t.TimeZone == time.UTC:
// Convert to session timezone.
err = t.ConvertTimeZone(time.UTC, loc)
if err != nil {
return ret, errors.Trace(err)
}
case t.TimeZone == sc.TimeZone:
default:
return ret, errors.New("get a wrong input")
}
}
t, err = t.RoundFrac(fsp)
case KindMysqlDuration:
t, err = d.GetMysqlDuration().ConvertToTime(mysql.TypeTimestamp)
if err != nil {
ret.SetValue(t)
return ret, errors.Trace(err)
}
t, err = t.RoundFrac(fsp)
case KindString, KindBytes:
t, err = ParseTime(sc, d.GetString(), mysql.TypeTimestamp, fsp)
case KindInt64:
t, err = ParseTimeFromNum(sc, d.GetInt64(), mysql.TypeTimestamp, fsp)
default:
return invalidConv(d, mysql.TypeTimestamp)
}
t.Type = mysql.TypeTimestamp
t.TimeZone = loc
ret.SetMysqlTime(t)
if err != nil {
return ret, errors.Trace(err)
}
return ret, nil
}
func (d *Datum) convertToMysqlTime(sc *variable.StatementContext, target *FieldType) (Datum, error) {
tp := target.Tp
fsp := DefaultFsp
if target.Decimal != UnspecifiedLength {
fsp = target.Decimal
}
var (
ret Datum
t Time
err error
)
switch d.k {
case KindMysqlTime:
t, err = d.GetMysqlTime().Convert(sc, tp)
if err != nil {
ret.SetValue(t)
return ret, errors.Trace(err)
}
t, err = t.RoundFrac(fsp)
case KindMysqlDuration:
t, err = d.GetMysqlDuration().ConvertToTime(tp)
if err != nil {
ret.SetValue(t)
return ret, errors.Trace(err)
}
t, err = t.RoundFrac(fsp)
case KindString, KindBytes:
t, err = ParseTime(sc, d.GetString(), tp, fsp)
case KindInt64:
t, err = ParseTimeFromNum(sc, d.GetInt64(), tp, fsp)
default:
return invalidConv(d, tp)
}
if tp == mysql.TypeDate {
// Truncate hh:mm:ss part if the type is Date.
t.Time = FromDate(t.Time.Year(), t.Time.Month(), t.Time.Day(), 0, 0, 0, 0)
}
ret.SetValue(t)
if err != nil {
return ret, errors.Trace(err)
}
return ret, nil
}
func (d *Datum) convertToMysqlDuration(sc *variable.StatementContext, target *FieldType) (Datum, error) {
tp := target.Tp
fsp := DefaultFsp
if target.Decimal != UnspecifiedLength {
fsp = target.Decimal
}
var ret Datum
switch d.k {
case KindMysqlTime:
dur, err := d.GetMysqlTime().ConvertToDuration()
if err != nil {
ret.SetValue(dur)
return ret, errors.Trace(err)
}
dur, err = dur.RoundFrac(fsp)
ret.SetValue(dur)
if err != nil {