types

package
v0.1.1-beta.1 Latest Latest
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 Go to latest Published: Jun 30, 2022 License: Apache-2.0, Apache-2.0 Imports: 27 Imported by: 0

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Index

Constants

View Source 
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
)

Kind constants.

View Source 
const (
	DateTimeStr = "datetime"
	TimeStr     = "time"
)

const strings for ErrWrongValue

View Source 
const (
	// ETInt represents type INT in evaluation.
	ETInt = ast.ETInt
	// ETReal represents type REAL in evaluation.
	ETReal = ast.ETReal
	// ETDecimal represents type DECIMAL in evaluation.
	ETDecimal = ast.ETDecimal
	// ETString represents type STRING in evaluation.
	ETString = ast.ETString
	// ETDatetime represents type DATETIME in evaluation.
	ETDatetime = ast.ETDatetime
	// ETTimestamp represents type TIMESTAMP in evaluation.
	ETTimestamp = ast.ETTimestamp
	// ETDuration represents type DURATION in evaluation.
	ETDuration = ast.ETDuration
	// ETJson represents type JSON in evaluation.
	ETJson = ast.ETJson
)
View Source 
const (
	// UnspecifiedFsp is the unspecified fractional seconds part.
	UnspecifiedFsp = int8(-1)
	// MaxFsp is the maximum digit of fractional seconds part.
	MaxFsp = int8(6)
	// MinFsp is the minimum digit of fractional seconds part.
	MinFsp = int8(0)
	// DefaultFsp is the default digit of fractional seconds part.
	// MySQL use 0 as the default Fsp.
	DefaultFsp = int8(0)
)
View Source 
const (
	TimeFormat = "2006-01-02 15:04:05"
	// TimeFSPFormat is time format with fractional seconds precision.
	TimeFSPFormat = "2006-01-02 15:04:05.000000"
)

Time format without fractional seconds precision.

View Source 
const (
	// MinYear is the minimum for mysql year type.
	MinYear int16 = 1901
	// MaxYear is the maximum for mysql year type.
	MaxYear int16 = 2155
	// MaxDuration is the maximum for duration.
	MaxDuration int64 = 838*10000 + 59*100 + 59
	// MinTime is the minimum for mysql time type.
	MinTime = -gotime.Duration(838*3600+59*60+59) * gotime.Second
	// MaxTime is the maximum for mysql time type.
	MaxTime = gotime.Duration(838*3600+59*60+59) * gotime.Second

	// TimeMaxHour is the max hour for mysql time type.
	TimeMaxHour = 838
	// TimeMaxMinute is the max minute for mysql time type.
	TimeMaxMinute = 59
	// TimeMaxSecond is the max second for mysql time type.
	TimeMaxSecond = 59
	// TimeMaxValue is the maximum value for mysql time type.
	TimeMaxValue = TimeMaxHour*10000 + TimeMaxMinute*100 + TimeMaxSecond
	// TimeMaxValueSeconds is the maximum second value for mysql time type.
	TimeMaxValueSeconds = TimeMaxHour*3600 + TimeMaxMinute*60 + TimeMaxSecond
)
View Source 
const (
	// YearIndex is index of 'YEARS-MONTHS DAYS HOURS:MINUTES:SECONDS.MICROSECONDS' expr Format
	YearIndex = 0 + iota
	// MonthIndex is index of 'YEARS-MONTHS DAYS HOURS:MINUTES:SECONDS.MICROSECONDS' expr Format
	MonthIndex
	// DayIndex is index of 'YEARS-MONTHS DAYS HOURS:MINUTES:SECONDS.MICROSECONDS' expr Format
	DayIndex
	// HourIndex is index of 'YEARS-MONTHS DAYS HOURS:MINUTES:SECONDS.MICROSECONDS' expr Format
	HourIndex
	// MinuteIndex is index of 'YEARS-MONTHS DAYS HOURS:MINUTES:SECONDS.MICROSECONDS' expr Format
	MinuteIndex
	// SecondIndex is index of 'YEARS-MONTHS DAYS HOURS:MINUTES:SECONDS.MICROSECONDS' expr Format
	SecondIndex
	// MicrosecondIndex is index of 'YEARS-MONTHS DAYS HOURS:MINUTES:SECONDS.MICROSECONDS' expr Format
	MicrosecondIndex
)
View Source 
const (
	// YearMonthMaxCnt is max parameters count 'YEARS-MONTHS' expr Format allowed
	YearMonthMaxCnt = 2
	// DayHourMaxCnt is max parameters count 'DAYS HOURS' expr Format allowed
	DayHourMaxCnt = 2
	// DayMinuteMaxCnt is max parameters count 'DAYS HOURS:MINUTES' expr Format allowed
	DayMinuteMaxCnt = 3
	// DaySecondMaxCnt is max parameters count 'DAYS HOURS:MINUTES:SECONDS' expr Format allowed
	DaySecondMaxCnt = 4
	// DayMicrosecondMaxCnt is max parameters count 'DAYS HOURS:MINUTES:SECONDS.MICROSECONDS' expr Format allowed
	DayMicrosecondMaxCnt = 5
	// HourMinuteMaxCnt is max parameters count 'HOURS:MINUTES' expr Format allowed
	HourMinuteMaxCnt = 2
	// HourSecondMaxCnt is max parameters count 'HOURS:MINUTES:SECONDS' expr Format allowed
	HourSecondMaxCnt = 3
	// HourMicrosecondMaxCnt is max parameters count 'HOURS:MINUTES:SECONDS.MICROSECONDS' expr Format allowed
	HourMicrosecondMaxCnt = 4
	// MinuteSecondMaxCnt is max parameters count 'MINUTES:SECONDS' expr Format allowed
	MinuteSecondMaxCnt = 2
	// MinuteMicrosecondMaxCnt is max parameters count 'MINUTES:SECONDS.MICROSECONDS' expr Format allowed
	MinuteMicrosecondMaxCnt = 3
	// SecondMicrosecondMaxCnt is max parameters count 'SECONDS.MICROSECONDS' expr Format allowed
	SecondMicrosecondMaxCnt = 2
	// TimeValueCnt is parameters count 'YEARS-MONTHS DAYS HOURS:MINUTES:SECONDS.MICROSECONDS' expr Format
	TimeValueCnt = 7
)
View Source 
const (
	// GoDurationDay is the gotime.Duration which equals to a Day.
	GoDurationDay = gotime.Hour * 24
)
View Source 
const MyDecimalStructSize = 40

MyDecimalStructSize is the struct size of MyDecimal.

View Source 
const UnspecifiedLength = -1

UnspecifiedLength is unspecified length.

Variables

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var (
	// ZeroDuration is the zero value for Duration type.
	ZeroDuration = Duration{Duration: gotime.Duration(0), Fsp: DefaultFsp}

	// ZeroCoreTime is the zero value for Time type.
	ZeroTime = Time{}

	// ZeroDatetime is the zero value for datetime Time.
	ZeroDatetime = NewTime(ZeroCoreTime, mysql.TypeDatetime, DefaultFsp)

	// ZeroTimestamp is the zero value for timestamp Time.
	ZeroTimestamp = NewTime(ZeroCoreTime, mysql.TypeTimestamp, DefaultFsp)

	// ZeroDate is the zero value for date Time.
	ZeroDate = NewTime(ZeroCoreTime, mysql.TypeDate, DefaultFsp)
)

Zero values for different types.

View Source 
var (
	// MinDatetime is the minimum for Golang Time type.
	MinDatetime = FromDate(1, 1, 1, 0, 0, 0, 0)
	// MaxDatetime is the maximum for mysql datetime type.
	MaxDatetime = FromDate(9999, 12, 31, 23, 59, 59, 999999)

	// BoundTimezone is the timezone for min and max timestamp.
	BoundTimezone = gotime.UTC
	// MinTimestamp is the minimum for mysql timestamp type.
	MinTimestamp = NewTime(FromDate(1970, 1, 1, 0, 0, 1, 0), mysql.TypeTimestamp, DefaultFsp)
	// MaxTimestamp is the maximum for mysql timestamp type.
	MaxTimestamp = NewTime(FromDate(2038, 1, 19, 3, 14, 7, 999999), mysql.TypeTimestamp, DefaultFsp)

	// WeekdayNames lists names of weekdays, which are used in builtin time function `dayname`.
	WeekdayNames = []string{
		"Monday",
		"Tuesday",
		"Wednesday",
		"Thursday",
		"Friday",
		"Saturday",
		"Sunday",
	}

	// MonthNames lists names of months, which are used in builtin time function `monthname`.
	MonthNames = []string{
		"January", "February",
		"March", "April",
		"May", "June",
		"July", "August",
		"September", "October",
		"November", "December",
	}
)
View Source 
var EmptyName = &FieldName{Hidden: true}

EmptyName is to occupy the position in the name slice. If it's set, that column's name is hidden.

View Source 
var IsTypeBlob = ast.IsTypeBlob

IsTypeBlob returns a boolean indicating whether the tp is a blob type.

View Source 
var IsTypeChar = ast.IsTypeChar

IsTypeChar returns a boolean indicating whether the tp is the char type like a string type or a varchar type.

View Source 
var TypeStr = ast.TypeStr

TypeStr converts tp to a string.

View Source 
var ZeroBinaryLiteral = BinaryLiteral{}

ZeroBinaryLiteral is a BinaryLiteral literal with zero value.

View Source 
var ZeroCoreTime = CoreTime(0)

ZeroCoreTime is the zero value for TimeInternal type.

Functions

func AddDate 

func AddDate(year, month, day int64, ot gotime.Time) (nt gotime.Time)

AddDate fix gap between mysql and golang api When we execute select date_add('2018-01-31',interval 1 month) in mysql we got 2018-02-28 but in tidb we got 2018-03-03. Dig it and we found it's caused by golang api time.Date(year int, month Month, day, hour, min, sec, nsec int, loc *Location) Time , it says October 32 converts to November 1 ,it conflicts with mysql. See https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date-add

func AddDuration 

func AddDuration(a time.Duration, b time.Duration) (time.Duration, error)

AddDuration adds time.Duration a and b if no overflow, otherwise returns error.

func AddInt64 

func AddInt64(a int64, b int64) (int64, error)

AddInt64 adds int64 a and b if no overflow, otherwise returns error.

func AdjustYear 

func AdjustYear(y int64, adjustZero bool) (int64, error)

AdjustYear is used for adjusting year and checking its validation.

func CheckFsp 

func CheckFsp(fsp int) (int8, error)

CheckFsp checks whether fsp is in valid range.

func CompareDuration 

func CompareDuration(x, y time.Duration) int

CompareDuration returns an integer comparing the duration x to y.

func CompareFloat64 

func CompareFloat64(x, y float64) int

CompareFloat64 returns an integer comparing the float64 x to y.

func CompareInt64 

func CompareInt64(x, y int64) int

CompareInt64 returns an integer comparing the int64 x to y.

func CompareString 

func CompareString(x, y, collation string) int

CompareString returns an integer comparing the string x to y with the specified collation and length.

func CompareUint64 

func CompareUint64(x, y uint64) int

CompareUint64 returns an integer comparing the uint64 x to y.

func ConvertDecimalToUint 

func ConvertDecimalToUint(sc *stmtctx.StatementContext, d *MyDecimal, upperBound uint64, tp byte) (uint64, error)

ConvertDecimalToUint converts a decimal to a uint by converting it to a string first to avoid float overflow (#10181).

func ConvertFloatToInt 

func ConvertFloatToInt(fval float64, lowerBound, upperBound int64, tp byte) (int64, error)

ConvertFloatToInt converts a float64 value to a int value. `tp` is used in err msg, if there is overflow, this func will report err according to `tp`

func ConvertFloatToUint 

func ConvertFloatToUint(sc *stmtctx.StatementContext, fval float64, upperBound uint64, tp byte) (uint64, error)

ConvertFloatToUint converts a float value to an uint value.

func ConvertIntToInt 

func ConvertIntToInt(val int64, lowerBound int64, upperBound int64, tp byte) (int64, error)

ConvertIntToInt converts an int value to another int value of different precision.

func ConvertIntToUint 

func ConvertIntToUint(sc *stmtctx.StatementContext, val int64, upperBound uint64, tp byte) (uint64, error)

ConvertIntToUint converts an int value to an uint value.

func ConvertJSONToFloat 

func ConvertJSONToFloat(sc *stmtctx.StatementContext, j json.BinaryJSON) (float64, error)

ConvertJSONToFloat casts JSON into float64.

func ConvertJSONToInt 

func ConvertJSONToInt(sc *stmtctx.StatementContext, j json.BinaryJSON, unsigned bool, tp byte) (int64, error)

ConvertJSONToInt casts JSON into int by type.

func ConvertJSONToInt64 

func ConvertJSONToInt64(sc *stmtctx.StatementContext, j json.BinaryJSON, unsigned bool) (int64, error)

ConvertJSONToInt64 casts JSON into int64.

func ConvertUintToInt 

func ConvertUintToInt(val uint64, upperBound int64, tp byte) (int64, error)

ConvertUintToInt converts an uint value to an int value.

func ConvertUintToUint 

func ConvertUintToUint(val uint64, upperBound uint64, tp byte) (uint64, error)

ConvertUintToUint converts an uint value to another uint value of different precision.

func DateDiff 

func DateDiff(startTime, endTime CoreTime) int

DateDiff calculates number of days between two days.

func DateFSP 

func DateFSP(date string) (fsp int)

DateFSP gets fsp from date string.

func DateTimeIsOverflow 

func DateTimeIsOverflow(sc *stmtctx.StatementContext, date Time) (bool, error)

DateTimeIsOverflow returns if this date is overflow. See: https://dev.mysql.com/doc/refman/8.0/en/datetime.html

func DatumsToStrNoErr 

func DatumsToStrNoErr(datums []Datum) string

DatumsToStrNoErr converts some datums to a formatted string. If an error occurs, it will print a log instead of returning an error.

func DatumsToString 

func DatumsToString(datums []Datum, handleSpecialValue bool) (string, error)

DatumsToString converts several datums to formatted string.

func DecimalAdd 

func DecimalAdd(from1, from2, to *MyDecimal) error

DecimalAdd adds two decimals, sets the result to 'to'. Note: DO NOT use `from1` or `from2` as `to` since the metadata of `to` may be changed during evaluating.

func DecimalBinSize 

func DecimalBinSize(precision, frac int) int

DecimalBinSize returns the size of array to hold a binary representation of a decimal.

func DecimalDiv 

func DecimalDiv(from1, from2, to *MyDecimal, fracIncr int) error

DecimalDiv does division of two decimals.

from1 - dividend from2 - divisor to - quotient fracIncr - increment of fraction

func DecimalMod 

func DecimalMod(from1, from2, to *MyDecimal) error

DecimalMod does modulus of two decimals. 

    from1   - dividend
    from2   - divisor
    to      - modulus

RETURN VALUE
  E_DEC_OK/E_DEC_TRUNCATED/E_DEC_OVERFLOW/E_DEC_DIV_ZERO;

NOTES
  see do_div_mod()

DESCRIPTION
  the modulus R in    R = M mod N

 is defined as

   0 <= |R| < |M|
   sign R == sign M
   R = M - k*N, where k is integer

 thus, there's no requirement for M or N to be integers

func DecimalMul 

func DecimalMul(from1, from2, to *MyDecimal) error

DecimalMul multiplies two decimals. 

    from1, from2 - factors
    to      - product

RETURN VALUE
  E_DEC_OK/E_DEC_TRUNCATED/E_DEC_OVERFLOW;

NOTES
  in this implementation, with wordSize=4 we have digitsPerWord=9,
  and 63-digit number will take only 7 words (basically a 7-digit
  "base 999999999" number).  Thus there's no need in fast multiplication
  algorithms, 7-digit numbers can be multiplied with a naive O(n*n)
  method.

  XXX if this library is to be used with huge numbers of thousands of
  digits, fast multiplication must be implemented.

func DecimalPeak 

func DecimalPeak(b []byte) (int, error)

DecimalPeak returns the length of the encoded decimal.

func DecimalSub 

func DecimalSub(from1, from2, to *MyDecimal) error

DecimalSub subs one decimal from another, sets the result to 'to'.

func DefaultParamTypeForValue 

func DefaultParamTypeForValue(value interface{}, tp *FieldType)

DefaultParamTypeForValue returns the default FieldType for the parameterized value.

func DefaultTypeForValue 

func DefaultTypeForValue(value interface{}, tp *FieldType, char string, collate string)

DefaultTypeForValue returns the default FieldType for the value.

func DivInt64 

func DivInt64(a int64, b int64) (int64, error)

DivInt64 divides int64 a with b, returns int64 if no overflow error. It just checks overflow, if b is zero, a "divide by zero" panic throws.

func DivIntWithUint 

func DivIntWithUint(a int64, b uint64) (uint64, error)

DivIntWithUint divides int64 a with uint64 b, returns uint64 if no overflow error. It just checks overflow, if b is zero, a "divide by zero" panic throws.

func DivUintWithInt 

func DivUintWithInt(a uint64, b int64) (uint64, error)

DivUintWithInt divides uint64 a with int64 b, returns uint64 if no overflow error. It just checks overflow, if b is zero, a "divide by zero" panic throws.

func ExtractDatetimeNum 

func ExtractDatetimeNum(t *Time, unit string) (int64, error)

ExtractDatetimeNum extracts time value number from datetime unit and format.

func ExtractDurationNum 

func ExtractDurationNum(d *Duration, unit string) (res int64, err error)

ExtractDurationNum extracts duration value number from duration unit and format.

func FormatIntWidthN 

func FormatIntWidthN(num, n int) string

FormatIntWidthN uses to format int with width. Insufficient digits are filled by 0.

func GetFormatType 

func GetFormatType(format string) (isDuration, isDate bool)

GetFormatType checks the type(Duration, Date or Datetime) of a format string.

func GetFracIndex 

func GetFracIndex(s string) (index int)

GetFracIndex finds the last '.' for get fracStr, index = -1 means fracStr not found. but for format like '2019.01.01 00:00:00', the index should be -1.

func GetFsp 

func GetFsp(s string) int8

GetFsp gets the fsp of a string.

func GetLastDay 

func GetLastDay(year, month int) int

GetLastDay returns the last day of the month

func GetMaxFloat 

func GetMaxFloat(flen int, decimal int) float64

GetMaxFloat gets the max float for given flen and decimal.

func GetTimezone 

func GetTimezone(lit string) (idx int, tzSign, tzHour, tzSep, tzMinute string)

GetTimezone parses the trailing timezone information of a given time string literal. If idx = -1 is returned, it means timezone information not found, otherwise it indicates the index of the starting index of the timezone information. If the timezone contains sign, hour part and/or minute part, it will be returned as is, otherwise an empty string will be returned.

Supported syntax: 

MySQL compatible: ((?P<tz_sign>[-+])(?P<tz_hour>[0-9]{2}):(?P<tz_minute>[0-9]{2})){0,1}$, see
  https://dev.mysql.com/doc/refman/8.0/en/time-zone-support.html and https://dev.mysql.com/doc/refman/8.0/en/datetime.html
  the first link specified that timezone information should be in "[H]H:MM, prefixed with a + or -" while the
  second link specified that for string literal, "hour values less than than 10, a leading zero is required.".
ISO-8601: Z|((((?P<tz_sign>[-+])(?P<tz_hour>[0-9]{2})(:(?P<tz_minute>[0-9]{2}){0,1}){0,1})|((?P<tz_minute>[0-9]{2}){0,1}){0,1}))$
  see https://www.cl.cam.ac.uk/~mgk25/iso-time.html

func IntergerSignedLowerBound 

func IntergerSignedLowerBound(intType byte) int64

IntergerSignedLowerBound indicates the min int64 values of different mysql types.

func IntergerSignedUpperBound 

func IntergerSignedUpperBound(intType byte) int64

IntergerSignedUpperBound indicates the max int64 values of different mysql types.

func IntergerUnsignedUpperBound 

func IntergerUnsignedUpperBound(intType byte) uint64

IntergerUnsignedUpperBound indicates the max uint64 values of different mysql types.

func IsBinaryStr 

func IsBinaryStr(ft *FieldType) bool

IsBinaryStr returns a boolean indicating whether the field type is a binary string type.

func IsClockUnit 

func IsClockUnit(unit string) bool

IsClockUnit returns true when unit is interval unit with hour, minute or second.

func IsDateFormat 

func IsDateFormat(format string) bool

IsDateFormat returns true when the specified time format could contain only date.

func IsNonBinaryStr 

func IsNonBinaryStr(ft *FieldType) bool

IsNonBinaryStr returns a boolean indicating whether the field type is a non-binary string type.

func IsString 

func IsString(tp byte) bool

IsString returns a boolean indicating whether the field type is a string type.

func IsTemporalWithDate 

func IsTemporalWithDate(tp byte) bool

IsTemporalWithDate returns a boolean indicating whether the tp is time type with date.

func IsTypeInteger 

func IsTypeInteger(tp byte) bool

IsTypeInteger returns a boolean indicating whether the tp is integer type.

func IsTypeNumeric 

func IsTypeNumeric(tp byte) bool

IsTypeNumeric returns a boolean indicating whether the tp is numeric type.

func IsTypeTemporal 

func IsTypeTemporal(tp byte) bool

IsTypeTemporal checks if a type is a temporal type.

func IsTypeTime 

func IsTypeTime(tp byte) bool

IsTypeTime returns a boolean indicating whether the tp is time type like datetime, date or timestamp.

func IsTypeUnspecified 

func IsTypeUnspecified(tp byte) bool

IsTypeUnspecified returns a boolean indicating whether the tp is the Unspecified type.

func IsTypeVarchar 

func IsTypeVarchar(tp byte) bool

IsTypeVarchar returns a boolean indicating whether the tp is the varchar type like a varstring type or a varchar type.

func KindStr 

func KindStr(kind byte) (r string)

KindStr converts kind to a string.

func MergeFieldType 

func MergeFieldType(a byte, b byte) byte

MergeFieldType merges two MySQL type to a new type. This is used in hybrid field type expression. For example "select case c when 1 then 2 when 2 then 'tidb' from t;" The result field type of the case expression is the merged type of the two when clause. See https://github.com/mysql/mysql-server/blob/8.0/sql/field.cc#L1042

func ParseDateFormat 

func ParseDateFormat(format string) []string

ParseDateFormat parses a formatted date string and returns separated components.

func ParseDurationValue 

func ParseDurationValue(unit string, format string) (y int64, m int64, d int64, n int64, _ error)

ParseDurationValue parses time value from time unit and format. Returns y years m months d days + n nanoseconds Nanoseconds will no longer than one day.

func ParseFrac 

func ParseFrac(s string, fsp int8) (v int, overflow bool, err error)

ParseFrac parses the input string according to fsp, returns the microsecond, and also a bool value to indice overflow. eg: "999" fsp=2 will overflow.

func ProduceFloatWithSpecifiedTp 

func ProduceFloatWithSpecifiedTp(f float64, target *FieldType, sc *stmtctx.StatementContext) (_ float64, err error)

ProduceFloatWithSpecifiedTp produces a new float64 according to `flen` and `decimal`.

func ProduceStrWithSpecifiedTp 

func ProduceStrWithSpecifiedTp(s string, tp *FieldType, sc *stmtctx.StatementContext, padZero bool) (_ string, err error)

ProduceStrWithSpecifiedTp produces a new string according to `flen` and `chs`. Param `padZero` indicates whether we should pad `\0` for `binary(flen)` type.

func Round 

func Round(f float64, dec int) float64

Round rounds the argument f to dec decimal places. dec defaults to 0 if not specified. dec can be negative to cause dec digits left of the decimal point of the value f to become zero.

func RoundFloat 

func RoundFloat(f float64) float64

RoundFloat rounds float val to the nearest even integer value with float64 format, like MySQL Round function. RoundFloat uses default rounding mode, see https://dev.mysql.com/doc/refman/5.7/en/precision-math-rounding.html so rounding use "round to nearest even". e.g, 1.5 -> 2, -1.5 -> -2.

func RoundFrac 

func RoundFrac(t gotime.Time, fsp int8) (gotime.Time, error)

RoundFrac rounds fractional seconds precision with new fsp and returns a new one. We will use the “round half up” rule, e.g, >= 0.5 -> 1, < 0.5 -> 0, so 2011:11:11 10:10:10.888888 round 0 -> 2011:11:11 10:10:11 and 2011:11:11 10:10:10.111111 round 0 -> 2011:11:11 10:10:10

func SetBinChsClnFlag 

func SetBinChsClnFlag(ft *FieldType)

SetBinChsClnFlag sets charset, collation as 'binary' and adds binaryFlag to FieldType.

func SetTypeFlag 

func SetTypeFlag(flag *uint, flagItem uint, on bool)

SetTypeFlag turns the flagItem on or off.

func StrToDuration 

func StrToDuration(sc *stmtctx.StatementContext, str string, fsp int8) (d Duration, t Time, isDuration bool, err error)

StrToDuration converts str to Duration. It returns Duration in normal case, and returns Time when str is in datetime format. when isDuration is true, the d is returned, when it is false, the t is returned. See https://dev.mysql.com/doc/refman/5.5/en/date-and-time-literals.html.

func StrToFloat 

func StrToFloat(sc *stmtctx.StatementContext, str string, isFuncCast bool) (float64, error)

StrToFloat converts a string to a float64 at the best-effort.

func StrToInt 

func StrToInt(sc *stmtctx.StatementContext, str string, isFuncCast bool) (int64, error)

StrToInt converts a string to an integer at the best-effort.

func StrToUint 

func StrToUint(sc *stmtctx.StatementContext, str string, isFuncCast bool) (uint64, error)

StrToUint converts a string to an unsigned integer at the best-effortt.

func SubDuration 

func SubDuration(a time.Duration, b time.Duration) (time.Duration, error)

SubDuration subtracts time.Duration a with b and returns time.Duration if no overflow error.

func SubInt64 

func SubInt64(a int64, b int64) (int64, error)

SubInt64 subtracts int64 a with b and returns int64 if no overflow error.

func TimestampDiff 

func TimestampDiff(unit string, t1 Time, t2 Time) int64

TimestampDiff returns t2 - t1 where t1 and t2 are date or datetime expressions. The unit for the result (an integer) is given by the unit argument. The legal values for unit are "YEAR" "QUARTER" "MONTH" "DAY" "HOUR" "SECOND" and so on.

func Truncate 

func Truncate(f float64, dec int) float64

Truncate truncates the argument f to dec decimal places. dec defaults to 0 if not specified. dec can be negative to cause dec digits left of the decimal point of the value f to become zero.

func TruncateFloat 

func TruncateFloat(f float64, flen int, decimal int) (float64, error)

TruncateFloat tries to truncate f. If the result exceeds the max/min float that flen/decimal allowed, returns the max/min float allowed.

func TruncateFrac 

func TruncateFrac(t gotime.Time, fsp int8) (gotime.Time, error)

TruncateFrac truncates fractional seconds precision with new fsp and returns a new one. 2011:11:11 10:10:10.888888 round 0 -> 2011:11:11 10:10:10 2011:11:11 10:10:10.111111 round 0 -> 2011:11:11 10:10:10

func TruncateOverflowMySQLTime 

func TruncateOverflowMySQLTime(d gotime.Duration) (gotime.Duration, error)

TruncateOverflowMySQLTime truncates d when it overflows, and returns ErrTruncatedWrongVal.

func VecCompareII 

func VecCompareII(x, y, res []int64)

VecCompareII returns []int64 comparing the []int64 x to []int64 y

func VecCompareIU 

func VecCompareIU(x []int64, y []uint64, res []int64)

VecCompareIU returns []int64 comparing the []int64 x to []uint64y

func VecCompareUI 

func VecCompareUI(x []uint64, y, res []int64)

VecCompareUI returns []int64 comparing the []uint64 x to []int64y

func VecCompareUU 

func VecCompareUU(x, y []uint64, res []int64)

VecCompareUU returns []int64 comparing the []uint64 x to []uint64 y

Types

type BinaryLiteral 

type BinaryLiteral []byte

BinaryLiteral is the internal type for storing bit / hex literal type.

func NewBinaryLiteralFromUint 

func NewBinaryLiteralFromUint(value uint64, byteSize int) BinaryLiteral

NewBinaryLiteralFromUint creates a new BinaryLiteral instance by the given uint value in BitEndian. byteSize will be used as the length of the new BinaryLiteral, with leading bytes filled to zero. If byteSize is -1, the leading zeros in new BinaryLiteral will be trimmed.

func ParseBitStr 

func ParseBitStr(s string) (BinaryLiteral, error)

ParseBitStr parses bit string. The string format can be b'val', B'val' or 0bval, val must be 0 or 1. See https://dev.mysql.com/doc/refman/5.7/en/bit-value-literals.html

func ParseHexStr 

func ParseHexStr(s string) (BinaryLiteral, error)

ParseHexStr parses hexadecimal string literal. See https://dev.mysql.com/doc/refman/5.7/en/hexadecimal-literals.html

func (BinaryLiteral) Compare 

func (b BinaryLiteral) Compare(b2 BinaryLiteral) int

Compare compares BinaryLiteral to another one

func (BinaryLiteral) String 

func (b BinaryLiteral) String() string

String implements fmt.Stringer interface.

func (BinaryLiteral) ToBitLiteralString 

func (b BinaryLiteral) ToBitLiteralString(trimLeadingZero bool) string

ToBitLiteralString returns the bit literal representation for the literal.

func (BinaryLiteral) ToInt 

func (b BinaryLiteral) ToInt(sc *stmtctx.StatementContext) (uint64, error)

ToInt returns the int value for the literal.

func (BinaryLiteral) ToString 

func (b BinaryLiteral) ToString() string

ToString returns the string representation for the literal.

type BitLiteral 

type BitLiteral BinaryLiteral

BitLiteral is the bit literal type.

func NewBitLiteral 

func NewBitLiteral(s string) (BitLiteral, error)

NewBitLiteral parses bit string as BitLiteral type.

func (BitLiteral) ToString 

func (b BitLiteral) ToString() string

ToString implement ast.BinaryLiteral interface

type CoreTime 

type CoreTime uint64

CoreTime is the internal struct type for Time.

func FromDate 

func FromDate(year int, month int, day int, hour int, minute int, second int, microsecond int) CoreTime

FromDate makes a internal time representation from the given date.

func FromDateChecked 

func FromDateChecked(year, month, day, hour, minute, second, microsecond int) (CoreTime, bool)

FromDateChecked makes a internal time representation from the given date with field overflow check.

func FromGoTime 

func FromGoTime(t gotime.Time) CoreTime

FromGoTime translates time.Time to mysql time internal representation.

func (CoreTime) Day 

func (t CoreTime) Day() int

Day returns the day value.

func (CoreTime) GoTime 

func (t CoreTime) GoTime(loc *gotime.Location) (gotime.Time, error)

GoTime converts Time to GoTime.

func (CoreTime) Hour 

func (t CoreTime) Hour() int

Hour returns the hour value.

func (CoreTime) IsLeapYear 

func (t CoreTime) IsLeapYear() bool

IsLeapYear returns if it's leap year.

func (CoreTime) Microsecond 

func (t CoreTime) Microsecond() int

Microsecond returns the microsecond value.

func (CoreTime) Minute 

func (t CoreTime) Minute() int

Minute returns the minute value.

func (CoreTime) Month 

func (t CoreTime) Month() int

Month returns the month value.

func (CoreTime) Second 

func (t CoreTime) Second() int

Second returns the second value.

func (CoreTime) String 

func (t CoreTime) String() string

String implements fmt.Stringer.

func (CoreTime) Week 

func (t CoreTime) Week(mode int) int

Week returns week value.

func (CoreTime) Weekday 

func (t CoreTime) Weekday() gotime.Weekday

Weekday returns weekday value.

func (CoreTime) Year 

func (t CoreTime) Year() int

Year returns the year value.

func (CoreTime) YearDay 

func (t CoreTime) YearDay() int

YearDay returns year and day.

func (CoreTime) YearWeek 

func (t CoreTime) YearWeek(mode int) (int, int)

YearWeek returns year and week.

type Datum 

type Datum struct {
	// contains filtered or unexported fields
}

Datum is a data box holds different kind of data. It has better performance and is easier to use than `interface{}`.

func ChangeReverseResultByUpperLowerBound 

func ChangeReverseResultByUpperLowerBound(
	sc *stmtctx.StatementContext,
	retType *FieldType,
	res Datum,
	rType RoundingType) (Datum, error)

ChangeReverseResultByUpperLowerBound is for expression's reverse evaluation. Here is an example for what's effort for the function: CastRealAsInt(t.a), 

		if the type of column `t.a` is mysql.TypeDouble, and there is a row that t.a == MaxFloat64
		then the cast function will arrive a result MaxInt64. But when we do the reverse evaluation,
     if the result is MaxInt64, and the rounding type is ceiling. Then we should get the MaxFloat64
     instead of float64(MaxInt64).

Another example: cast(1.1 as signed) = 1, 

when we get the answer 1, we can only reversely evaluate 1.0 as the column value. So in this
case, we should judge whether the rounding type are ceiling. If it is, then we should plus one for
1.0 and get the reverse result 2.0.

func GetMaxValue 

func GetMaxValue(ft *FieldType) (max Datum)

GetMaxValue returns the max value datum for each type.

func GetMinValue 

func GetMinValue(ft *FieldType) (min Datum)

GetMinValue returns the min value datum for each type.

func MakeDatums 

func MakeDatums(args ...interface{}) []Datum

MakeDatums creates datum slice from interfaces.

func MaxValueDatum 

func MaxValueDatum() Datum

MaxValueDatum returns a datum represents max value.

func MinNotNullDatum 

func MinNotNullDatum() Datum

MinNotNullDatum returns a datum represents minimum not null value.

func NewBytesDatum 

func NewBytesDatum(b []byte) (d Datum)

NewBytesDatum creates a new Datum from a byte slice.

func NewCollateMysqlEnumDatum 

func NewCollateMysqlEnumDatum(e Enum, collation string) (d Datum)

NewCollateMysqlEnumDatum create a new MysqlEnum Datum for a Enum value with collation information.

func NewCollationStringDatum 

func NewCollationStringDatum(s string, collation string, length int) (d Datum)

NewCollationStringDatum creates a new Datum from a string with collation and length info.

func NewDatum 

func NewDatum(in interface{}) (d Datum)

NewDatum creates a new Datum from an interface{}.

func NewDecimalDatum 

func NewDecimalDatum(dec *MyDecimal) (d Datum)

NewDecimalDatum creates a new Datum from a MyDecimal value.

func NewDurationDatum 

func NewDurationDatum(dur Duration) (d Datum)

NewDurationDatum creates a new Datum from a Duration value.

func NewFloat32Datum 

func NewFloat32Datum(f float32) (d Datum)

NewFloat32Datum creates a new Datum from a float32 value.

func NewIntDatum 

func NewIntDatum(i int64) (d Datum)

NewIntDatum creates a new Datum from an int64 value.

func NewStringDatum 

func NewStringDatum(s string) (d Datum)

NewStringDatum creates a new Datum from a string.

func NewTimeDatum 

func NewTimeDatum(t Time) (d Datum)

NewTimeDatum creates a new Time from a Time value.

func NewUintDatum 

func NewUintDatum(i uint64) (d Datum)

NewUintDatum creates a new Datum from an uint64 value.

func (*Datum) Clone 

func (d *Datum) Clone() *Datum

Clone create a deep copy of the Datum.

func (*Datum) Collation 

func (d *Datum) Collation() string

Collation gets the collation of the datum.

func (*Datum) CompareDatum 

func (d *Datum) CompareDatum(sc *stmtctx.StatementContext, ad *Datum) (int, error)

CompareDatum compares datum to another datum. TODO: return error properly.

func (*Datum) ConvertTo 

func (d *Datum) ConvertTo(sc *stmtctx.StatementContext, target *FieldType) (Datum, error)

ConvertTo converts a datum to the target field type. change this method need sync modification to type2Kind in rowcodec/types.go

func (*Datum) ConvertToMysqlYear 

func (d *Datum) ConvertToMysqlYear(sc *stmtctx.StatementContext, target *FieldType) (Datum, error)

ConvertToMysqlYear converts a datum to MySQLYear.

func (*Datum) Copy 

func (d *Datum) Copy(dst *Datum)

Copy deep copies a Datum into destination.

func (*Datum) Frac 

func (d *Datum) Frac() int

Frac gets the frac of the datum.

func (*Datum) GetBinaryLiteral 

func (d *Datum) GetBinaryLiteral() BinaryLiteral

GetBinaryLiteral gets Bit value

func (*Datum) GetBinaryLiteral4Cmp 

func (d *Datum) GetBinaryLiteral4Cmp() BinaryLiteral

GetBinaryLiteral4Cmp gets Bit value, and remove it's prefix 0 for comparison.

func (*Datum) GetBytes 

func (d *Datum) GetBytes() []byte

GetBytes gets bytes value.

func (*Datum) GetFloat32 

func (d *Datum) GetFloat32() float32

GetFloat32 gets float32 value.

func (*Datum) GetFloat64 

func (d *Datum) GetFloat64() float64

GetFloat64 gets float64 value.

func (*Datum) GetInt64 

func (d *Datum) GetInt64() int64

GetInt64 gets int64 value.

func (*Datum) GetInterface 

func (d *Datum) GetInterface() interface{}

GetInterface gets interface value.

func (*Datum) GetMysqlBit 

func (d *Datum) GetMysqlBit() BinaryLiteral

GetMysqlBit gets MysqlBit value

func (*Datum) GetMysqlDecimal 

func (d *Datum) GetMysqlDecimal() *MyDecimal

GetMysqlDecimal gets Decimal value

func (*Datum) GetMysqlDuration 

func (d *Datum) GetMysqlDuration() Duration

GetMysqlDuration gets Duration value

func (*Datum) GetMysqlEnum 

func (d *Datum) GetMysqlEnum() Enum

GetMysqlEnum gets Enum value

func (*Datum) GetMysqlJSON 

func (d *Datum) GetMysqlJSON() json.BinaryJSON

GetMysqlJSON gets json.BinaryJSON value

func (*Datum) GetMysqlSet 

func (d *Datum) GetMysqlSet() Set

GetMysqlSet gets Set value

func (*Datum) GetMysqlTime 

func (d *Datum) GetMysqlTime() Time

GetMysqlTime gets types.Time value

func (*Datum) GetRaw 

func (d *Datum) GetRaw() []byte

GetRaw gets raw value.

func (*Datum) GetString 

func (d *Datum) GetString() string

GetString gets string value.

func (*Datum) GetUint64 

func (d *Datum) GetUint64() uint64

GetUint64 gets uint64 value.

func (*Datum) GetValue 

func (d *Datum) GetValue() interface{}

GetValue gets the value of the datum of any kind.

func (*Datum) IsNull 

func (d *Datum) IsNull() bool

IsNull checks if datum is null.

func (*Datum) Kind 

func (d *Datum) Kind() byte

Kind gets the kind of the datum.

func (*Datum) Length 

func (d *Datum) Length() int

Length gets the length of the datum.

func (*Datum) SetAutoID 

func (d *Datum) SetAutoID(id int64, flag uint)

SetAutoID set the auto increment ID according to its int flag.

func (*Datum) SetBinaryLiteral 

func (d *Datum) SetBinaryLiteral(b BinaryLiteral)

SetBinaryLiteral sets Bit value

func (*Datum) SetBytes 

func (d *Datum) SetBytes(b []byte)

SetBytes sets bytes value to datum.

func (*Datum) SetBytesAsString 

func (d *Datum) SetBytesAsString(b []byte, collation string, length uint32)

SetBytesAsString sets bytes value to datum as string type.

func (*Datum) SetCollation 

func (d *Datum) SetCollation(collation string)

SetCollation sets the collation of the datum.

func (*Datum) SetFloat32 

func (d *Datum) SetFloat32(f float32)

SetFloat32 sets float32 value.

func (*Datum) SetFloat64 

func (d *Datum) SetFloat64(f float64)

SetFloat64 sets float64 value.

func (*Datum) SetFrac 

func (d *Datum) SetFrac(frac int)

SetFrac sets the frac of the datum.

func (*Datum) SetInt64 

func (d *Datum) SetInt64(i int64)

SetInt64 sets int64 value.

func (*Datum) SetInterface 

func (d *Datum) SetInterface(x interface{})

SetInterface sets interface to datum.

func (*Datum) SetLength 

func (d *Datum) SetLength(l int)

SetLength sets the length of the datum.

func (*Datum) SetMinNotNull 

func (d *Datum) SetMinNotNull()

SetMinNotNull sets datum to minNotNull value.

func (*Datum) SetMysqlBit 

func (d *Datum) SetMysqlBit(b BinaryLiteral)

SetMysqlBit sets MysqlBit value

func (*Datum) SetMysqlDecimal 

func (d *Datum) SetMysqlDecimal(b *MyDecimal)

SetMysqlDecimal sets Decimal value

func (*Datum) SetMysqlDuration 

func (d *Datum) SetMysqlDuration(b Duration)

SetMysqlDuration sets Duration value

func (*Datum) SetMysqlEnum 

func (d *Datum) SetMysqlEnum(b Enum, collation string)

SetMysqlEnum sets Enum value

func (*Datum) SetMysqlJSON 

func (d *Datum) SetMysqlJSON(b json.BinaryJSON)

SetMysqlJSON sets json.BinaryJSON value

func (*Datum) SetMysqlSet 

func (d *Datum) SetMysqlSet(b Set, collation string)

SetMysqlSet sets Set value

func (*Datum) SetMysqlTime 

func (d *Datum) SetMysqlTime(b Time)

SetMysqlTime sets types.Time value

func (*Datum) SetNull 

func (d *Datum) SetNull()

SetNull sets datum to nil.

func (*Datum) SetRaw 

func (d *Datum) SetRaw(b []byte)

SetRaw sets raw value.

func (*Datum) SetString 

func (d *Datum) SetString(s string, collation string)

SetString sets string value.

func (*Datum) SetUint64 

func (d *Datum) SetUint64(i uint64)

SetUint64 sets uint64 value.

func (*Datum) SetValue 

func (d *Datum) SetValue(val interface{}, tp *types.FieldType)

SetValue sets any kind of value.

func (*Datum) SetValueWithDefaultCollation 

func (d *Datum) SetValueWithDefaultCollation(val interface{})

SetValueWithDefaultCollation sets any kind of value.

func (Datum) String 

func (d Datum) String() string

String returns a human-readable description of Datum. It is intended only for debugging.

func (*Datum) ToBool 

func (d *Datum) ToBool(sc *stmtctx.StatementContext) (int64, error)

ToBool converts to a bool. We will use 1 for true, and 0 for false.

func (*Datum) ToBytes 

func (d *Datum) ToBytes() ([]byte, error)

ToBytes gets the bytes representation of the datum.

func (*Datum) ToDecimal 

func (d *Datum) ToDecimal(sc *stmtctx.StatementContext) (*MyDecimal, error)

ToDecimal converts to a decimal.

func (*Datum) ToFloat64 

func (d *Datum) ToFloat64(sc *stmtctx.StatementContext) (float64, error)

ToFloat64 converts to a float64

func (*Datum) ToInt64 

func (d *Datum) ToInt64(sc *stmtctx.StatementContext) (int64, error)

ToInt64 converts to a int64.

func (*Datum) ToMysqlJSON 

func (d *Datum) ToMysqlJSON() (j json.BinaryJSON, err error)

ToMysqlJSON is similar to convertToMysqlJSON, except the latter parses from string, but the former uses it as primitive.

func (*Datum) ToString 

func (d *Datum) ToString() (string, error)

ToString gets the string representation of the datum.

type Duration 

type Duration struct {
	gotime.Duration
	// Fsp is short for Fractional Seconds Precision.
	// See http://dev.mysql.com/doc/refman/5.7/en/fractional-seconds.html
	Fsp int8
}

Duration is the type for MySQL TIME type.

func ExtractDurationValue 

func ExtractDurationValue(unit string, format string) (Duration, error)

ExtractDurationValue extract the value from format to Duration.

func MaxMySQLDuration 

func MaxMySQLDuration(fsp int8) Duration

MaxMySQLDuration returns Duration with maximum mysql time.

func NewDuration 

func NewDuration(hour, minute, second, microsecond int, fsp int8) Duration

NewDuration construct duration with time.

func NumberToDuration 

func NumberToDuration(number int64, fsp int8) (Duration, error)

NumberToDuration converts number to Duration.

func ParseDuration 

func ParseDuration(sc *stmtctx.StatementContext, str string, fsp int8) (Duration, error)

ParseDuration parses the time form a formatted string with a fractional seconds part, returns the duration type Time value. See http://dev.mysql.com/doc/refman/5.7/en/fractional-seconds.html

func (Duration) Add 

func (d Duration) Add(v Duration) (Duration, error)

Add adds d to d, returns a duration value.

func (Duration) Compare 

func (d Duration) Compare(o Duration) int

Compare returns an integer comparing the Duration instant t to o. If d is after o, returns 1, equal o, returns 0, before o, returns -1.

func (Duration) CompareString 

func (d Duration) CompareString(sc *stmtctx.StatementContext, str string) (int, error)

CompareString is like Compare, but parses str to Duration then compares.

func (Duration) ConvertToTime 

func (d Duration) ConvertToTime(sc *stmtctx.StatementContext, tp uint8) (Time, error)

ConvertToTime converts duration to Time. Tp is TypeDatetime, TypeTimestamp and TypeDate.

func (Duration) DurationFormat 

func (d Duration) DurationFormat(layout string) (string, error)

DurationFormat returns a textual representation of the duration value formatted according to layout. See http://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date-format

func (Duration) Hour 

func (d Duration) Hour() int

Hour returns current hour. e.g, hour("11:11:11") -> 11

func (Duration) MicroSecond 

func (d Duration) MicroSecond() int

MicroSecond returns current microsecond. e.g, hour("11:11:11.11") -> 110000

func (Duration) Minute 

func (d Duration) Minute() int

Minute returns current minute. e.g, hour("11:11:11") -> 11

func (Duration) Neg 

func (d Duration) Neg() Duration

Neg negative d, returns a duration value.

func (Duration) RoundFrac 

func (d Duration) RoundFrac(fsp int8) (Duration, error)

RoundFrac rounds fractional seconds precision with new fsp and returns a new one. We will use the “round half up” rule, e.g, >= 0.5 -> 1, < 0.5 -> 0, so 10:10:10.999999 round 0 -> 10:10:11 and 10:10:10.000000 round 0 -> 10:10:10

func (Duration) Second 

func (d Duration) Second() int

Second returns current second. e.g, hour("11:11:11") -> 11

func (Duration) String 

func (d Duration) String() string

String returns the time formatted using default TimeFormat and fsp.

func (Duration) Sub 

func (d Duration) Sub(v Duration) (Duration, error)

Sub subtracts d to d, returns a duration value.

func (Duration) ToNumber 

func (d Duration) ToNumber() *MyDecimal

ToNumber changes duration to number format. e.g, 10:10:10 -> 101010

type Enum 

type Enum struct {
	Name  string
	Value uint64
}

Enum is for MySQL enum type.

func ParseEnum 

func ParseEnum(elems []string, name string, collation string) (Enum, error)

ParseEnum creates a Enum with item name or value.

func ParseEnumName 

func ParseEnumName(elems []string, name string, collation string) (Enum, error)

ParseEnumName creates a Enum with item name.

func ParseEnumValue 

func ParseEnumValue(elems []string, number uint64) (Enum, error)

ParseEnumValue creates a Enum with special number.

func (Enum) Copy 

func (e Enum) Copy() Enum

Copy deep copy an Enum.

func (Enum) String 

func (e Enum) String() string

String implements fmt.Stringer interface.

func (Enum) ToNumber 

func (e Enum) ToNumber() float64

ToNumber changes enum index to float64 for numeric operation.

type EvalType 

type EvalType = ast.EvalType

EvalType indicates the specified types that arguments and result of a built-in function should be.

func AggregateEvalType 

func AggregateEvalType(fts []*FieldType, flag *uint) EvalType

AggregateEvalType aggregates arguments' EvalType of a multi-argument function.

type FieldName 

type FieldName struct {
	OrigTblName model.CIStr
	OrigColName model.CIStr
	DBName      model.CIStr
	TblName     model.CIStr
	ColName     model.CIStr

	Hidden bool

	// NotExplicitUsable is used for mark whether a column can be explicit used in SQL.
	// update stmt can write `writeable` column implicitly but cannot use non-public columns explicit.
	// e.g. update t set a = 10 where b = 10; which `b` is in `writeOnly` state
	NotExplicitUsable bool
}

FieldName records the names used for mysql protocol.

func (*FieldName) String 

func (name *FieldName) String() string

String implements Stringer interface.

type FieldType 

type FieldType = ast.FieldType

FieldType records field type information.

func AggFieldType 

func AggFieldType(tps []*FieldType) *FieldType

AggFieldType aggregates field types for a multi-argument function like `IF`, `IFNULL`, `COALESCE` whose return type is determined by the arguments' FieldTypes. Aggregation is performed by MergeFieldType function.

func NewFieldType 

func NewFieldType(tp byte) *FieldType

NewFieldType returns a FieldType, with a type and other information about field type.

func NewFieldTypeWithCollation 

func NewFieldTypeWithCollation(tp byte, collation string, length int) *FieldType

NewFieldTypeWithCollation returns a FieldType, with a type and other information about field type.

type HexLiteral 

type HexLiteral BinaryLiteral

HexLiteral is the hex literal type.

func NewHexLiteral 

func NewHexLiteral(s string) (HexLiteral, error)

NewHexLiteral parses hexadecimal string as HexLiteral type.

func (HexLiteral) ToString 

func (b HexLiteral) ToString() string

ToString implement ast.BinaryLiteral interface

type MyDecimal 

type MyDecimal struct {
	// contains filtered or unexported fields
}

MyDecimal represents a decimal value.

func ConvertDatumToDecimal 

func ConvertDatumToDecimal(sc *stmtctx.StatementContext, d Datum) (*MyDecimal, error)

ConvertDatumToDecimal converts datum to decimal.

func ConvertJSONToDecimal 

func ConvertJSONToDecimal(sc *stmtctx.StatementContext, j json.BinaryJSON) (*MyDecimal, error)

ConvertJSONToDecimal casts JSON into decimal.

func DecimalNeg 

func DecimalNeg(from *MyDecimal) *MyDecimal

DecimalNeg reverses decimal's sign.

func NewDecFromInt 

func NewDecFromInt(i int64) *MyDecimal

NewDecFromInt creates a MyDecimal from int.

func NewDecFromUint 

func NewDecFromUint(i uint64) *MyDecimal

NewDecFromUint creates a MyDecimal from uint.

func NewMaxOrMinDec 

func NewMaxOrMinDec(negative bool, prec, frac int) *MyDecimal

NewMaxOrMinDec returns the max or min value decimal for given precision and fraction.

func ProduceDecWithSpecifiedTp 

func ProduceDecWithSpecifiedTp(dec *MyDecimal, tp *FieldType, sc *stmtctx.StatementContext) (_ *MyDecimal, err error)

ProduceDecWithSpecifiedTp produces a new decimal according to `flen` and `decimal`.

func (*MyDecimal) Compare 

func (d *MyDecimal) Compare(to *MyDecimal) int

Compare compares one decimal to another, returns -1/0/1.

func (*MyDecimal) FromBin 

func (d *MyDecimal) FromBin(bin []byte, precision, frac int) (binSize int, err error)

FromBin Restores decimal from its binary fixed-length representation.

func (*MyDecimal) FromFloat64 

func (d *MyDecimal) FromFloat64(f float64) error

FromFloat64 creates a decimal from float64 value.

func (*MyDecimal) FromInt 

func (d *MyDecimal) FromInt(val int64) *MyDecimal

FromInt sets the decimal value from int64.

func (*MyDecimal) FromString 

func (d *MyDecimal) FromString(str []byte) error

FromString parses decimal from string.

func (*MyDecimal) FromUint 

func (d *MyDecimal) FromUint(val uint64) *MyDecimal

FromUint sets the decimal value from uint64.

func (*MyDecimal) GetDigitsFrac 

func (d *MyDecimal) GetDigitsFrac() int8

GetDigitsFrac returns the digitsFrac.

func (*MyDecimal) GetDigitsInt 

func (d *MyDecimal) GetDigitsInt() int8

GetDigitsInt returns the digitsInt.

func (*MyDecimal) IsNegative 

func (d *MyDecimal) IsNegative() bool

IsNegative returns whether a decimal is negative.

func (*MyDecimal) IsZero 

func (d *MyDecimal) IsZero() bool

IsZero checks whether it's a zero decimal.

func (*MyDecimal) PrecisionAndFrac 

func (d *MyDecimal) PrecisionAndFrac() (precision, frac int)

PrecisionAndFrac returns the internal precision and frac number.

func (*MyDecimal) Round 

func (d *MyDecimal) Round(to *MyDecimal, frac int, roundMode RoundMode) (err error)

Round rounds the decimal to "frac" digits. 

   to			- result buffer. d == to is allowed
   frac			- to what position after fraction point to round. can be negative!
   roundMode		- round to nearest even or truncate
			ModeHalfEven rounds normally.
			Truncate just truncates the decimal.

NOTES 

scale can be negative !
one TRUNCATED error (line XXX below) isn't treated very logical :(

RETURN VALUE 

eDecOK/eDecTruncated

func (*MyDecimal) Shift 

func (d *MyDecimal) Shift(shift int) error

Shift shifts decimal digits in given number (with rounding if it need), shift > 0 means shift to left shift, shift < 0 means right shift. In fact it is multiplying on 10^shift.

RETURN 

eDecOK          OK
eDecOverflow    operation lead to overflow, number is untoched
eDecTruncated   number was rounded to fit into buffer

func (*MyDecimal) String 

func (d *MyDecimal) String() string

String returns the decimal string representation rounded to resultFrac.

func (*MyDecimal) ToBin 

func (d *MyDecimal) ToBin(precision, frac int) ([]byte, error)

ToBin converts decimal to its binary fixed-length representation two representations of the same length can be compared with memcmp with the correct -1/0/+1 result 

  PARAMS
		precision/frac - if precision is 0, internal value of the decimal will be used,
		then the encoded value is not memory comparable.

  NOTE
    the buffer is assumed to be of the size DecimalBinSize(precision, frac)

  RETURN VALUE
  	bin     - binary value
    errCode - eDecOK/eDecTruncate/eDecOverflow

  DESCRIPTION
    for storage decimal numbers are converted to the "binary" format.

    This format has the following properties:
      1. length of the binary representation depends on the {precision, frac}
      as provided by the caller and NOT on the digitsInt/digitsFrac of the decimal to
      convert.
      2. binary representations of the same {precision, frac} can be compared
      with memcmp - with the same result as DecimalCompare() of the original
      decimals (not taking into account possible precision loss during
      conversion).

    This binary format is as follows:
      1. First the number is converted to have a requested precision and frac.
      2. Every full digitsPerWord digits of digitsInt part are stored in 4 bytes
         as is
      3. The first digitsInt % digitesPerWord digits are stored in the reduced
         number of bytes (enough bytes to store this number of digits -
         see dig2bytes)
      4. same for frac - full word are stored as is,
         the last frac % digitsPerWord digits - in the reduced number of bytes.
      5. If the number is negative - every byte is inversed.
      5. The very first bit of the resulting byte array is inverted (because
         memcmp compares unsigned bytes, see property 2 above)

    Example:

      1234567890.1234

    internally is represented as 3 words

      1 234567890 123400000

    (assuming we want a binary representation with precision=14, frac=4)
    in hex it's

      00-00-00-01  0D-FB-38-D2  07-5A-EF-40

    now, middle word is full - it stores 9 decimal digits. It goes
    into binary representation as is:

      ...........  0D-FB-38-D2 ............

    First word has only one decimal digit. We can store one digit in
    one byte, no need to waste four:

                01 0D-FB-38-D2 ............

    now, last word. It's 123400000. We can store 1234 in two bytes:

                01 0D-FB-38-D2 04-D2

    So, we've packed 12 bytes number in 7 bytes.
    And now we invert the highest bit to get the final result:

                81 0D FB 38 D2 04 D2

    And for -1234567890.1234 it would be

                7E F2 04 C7 2D FB 2D

func (*MyDecimal) ToFloat64 

func (d *MyDecimal) ToFloat64() (float64, error)

ToFloat64 converts decimal to float64 value.

func (*MyDecimal) ToHashKey 

func (d *MyDecimal) ToHashKey() ([]byte, error)

ToHashKey removes the leading and trailing zeros and generates a hash key. Two Decimals dec0 and dec1 with different fraction will generate the same hash keys if dec0.Compare(dec1) == 0.

func (*MyDecimal) ToInt 

func (d *MyDecimal) ToInt() (int64, error)

ToInt returns int part of the decimal, returns the result and errcode.

func (*MyDecimal) ToString 

func (d *MyDecimal) ToString() (str []byte)

ToString converts decimal to its printable string representation without rounding. 

RETURN VALUE

    str       - result string
    errCode   - eDecOK/eDecTruncate/eDecOverflow

func (*MyDecimal) ToUint 

func (d *MyDecimal) ToUint() (uint64, error)

ToUint returns int part of the decimal, returns the result and errcode.

func (*MyDecimal) WriteBin 

func (d *MyDecimal) WriteBin(precision, frac int, buf []byte) ([]byte, error)

WriteBin encode and write the binary encoded to target buffer

type NameSlice 

type NameSlice []*FieldName

NameSlice is the slice of the *fieldName

func (NameSlice) FindAstColName 

func (s NameSlice) FindAstColName(name *ast.ColumnName) bool

FindAstColName checks whether the given ast.ColumnName is appeared in this slice.

func (NameSlice) Shallow 

func (s NameSlice) Shallow() NameSlice

Shallow is a shallow copy, only making a new slice.

type RoundMode 

type RoundMode int32

RoundMode is the type for round mode. 

const (
	DivFracIncr = 4

	// ModeHalfEven rounds normally.
	ModeHalfEven RoundMode = 5
	// Truncate just truncates the decimal.
	ModeTruncate RoundMode = 10
)

constant values.

type RoundingType 

type RoundingType uint8

RoundingType is used to indicate the rounding type for reversing evaluation. 

const (
	// Ceiling means rounding up.
	Ceiling RoundingType = iota
	// Floor means rounding down.
	Floor
)

type Set 

type Set struct {
	Name  string
	Value uint64
}

Set is for MySQL Set type.

func ParseSet 

func ParseSet(elems []string, name string, collation string) (Set, error)

ParseSet creates a Set with name or value.

func ParseSetName 

func ParseSetName(elems []string, name string, collation string) (Set, error)

ParseSetName creates a Set with name.

func ParseSetValue 

func ParseSetValue(elems []string, number uint64) (Set, error)

ParseSetValue creates a Set with special number.

func (Set) Copy 

func (e Set) Copy() Set

Copy deep copy a Set.

func (Set) String 

func (e Set) String() string

String implements fmt.Stringer interface.

func (Set) ToNumber 

func (e Set) ToNumber() float64

ToNumber changes Set to float64 for numeric operation.

type Time 

type Time struct {
	// contains filtered or unexported fields
}

Time is the struct for handling datetime, timestamp and date.

func NewTime 

func NewTime(coreTime CoreTime, tp uint8, fsp int8) Time

NewTime constructs time from core time, type and fsp.

func ParseDate 

func ParseDate(sc *stmtctx.StatementContext, str string) (Time, error)

ParseDate is a helper function wrapping ParseTime with date type.

func ParseDatetime 

func ParseDatetime(sc *stmtctx.StatementContext, str string) (Time, error)

ParseDatetime is a helper function wrapping ParseTime with datetime type and default fsp.

func ParseDatetimeFromNum 

func ParseDatetimeFromNum(sc *stmtctx.StatementContext, num int64) (Time, error)

ParseDatetimeFromNum is a helper function wrapping ParseTimeFromNum with datetime type and default fsp.

func ParseTime 

func ParseTime(sc *stmtctx.StatementContext, str string, tp byte, fsp int8) (Time, error)

ParseTime parses a formatted string with type tp and specific fsp. Type is TypeDatetime, TypeTimestamp and TypeDate. Fsp is in range [0, 6]. MySQL supports many valid datetime format, but still has some limitation. If delimiter exists, the date part and time part is separated by a space or T, other punctuation character can be used as the delimiter between date parts or time parts. If no delimiter, the format must be YYYYMMDDHHMMSS or YYMMDDHHMMSS If we have fractional seconds part, we must use decimal points as the delimiter. The valid datetime range is from '1000-01-01 00:00:00.000000' to '9999-12-31 23:59:59.999999'. The valid timestamp range is from '1970-01-01 00:00:01.000000' to '2038-01-19 03:14:07.999999'. The valid date range is from '1000-01-01' to '9999-12-31'

func ParseTimeFromFloatString 

func ParseTimeFromFloatString(sc *stmtctx.StatementContext, str string, tp byte, fsp int8) (Time, error)

ParseTimeFromFloatString is similar to ParseTime, except that it's used to parse a float converted string.

func ParseTimeFromInt64 

func ParseTimeFromInt64(sc *stmtctx.StatementContext, num int64) (Time, error)

ParseTimeFromInt64 parses mysql time value from int64.

func ParseTimeFromNum 

func ParseTimeFromNum(sc *stmtctx.StatementContext, num int64, tp byte, fsp int8) (Time, error)

ParseTimeFromNum parses a formatted int64, returns the value which type is tp.

func ParseTimeFromYear 

func ParseTimeFromYear(sc *stmtctx.StatementContext, year int64) (Time, error)

ParseTimeFromYear parse a `YYYY` formed year to corresponded Datetime type. Note: the invoker must promise the `year` is in the range [MinYear, MaxYear].

func ParseTimestamp 

func ParseTimestamp(sc *stmtctx.StatementContext, str string) (Time, error)

ParseTimestamp is a helper function wrapping ParseTime with timestamp type and default fsp.

func StrToDateTime 

func StrToDateTime(sc *stmtctx.StatementContext, str string, fsp int8) (Time, error)

StrToDateTime converts str to MySQL DateTime.

func TimeFromDays 

func TimeFromDays(num int64) Time

TimeFromDays Converts a day number to a date.

func (*Time) Add 

func (t *Time) Add(sc *stmtctx.StatementContext, d Duration) (Time, error)

Add adds d to t, returns the result time value.

func (*Time) Check 

func (t *Time) Check(sc *stmtctx.StatementContext) error

Check if 't' is valid

func (Time) Clock 

func (t Time) Clock() (hour int, minute int, second int)

Clock returns the hour, minute, and second within the day specified by t.

func (Time) Compare 

func (t Time) Compare(o Time) int

Compare returns an integer comparing the time instant t to o. If t is after o, returns 1, equal o, returns 0, before o, returns -1.

func (Time) CompareString 

func (t Time) CompareString(sc *stmtctx.StatementContext, str string) (int, error)

CompareString is like Compare, but parses string to Time then compares.

func (Time) Convert 

func (t Time) Convert(sc *stmtctx.StatementContext, tp uint8) (Time, error)

Convert converts t with type tp.

func (*Time) ConvertTimeZone 

func (t *Time) ConvertTimeZone(from, to *gotime.Location) error

ConvertTimeZone converts the time value from one timezone to another. The input time should be a valid timestamp.

func (Time) ConvertToDuration 

func (t Time) ConvertToDuration() (Duration, error)

ConvertToDuration converts mysql datetime, timestamp and date to mysql time type. e.g, 2012-12-12T10:10:10 -> 10:10:10 2012-12-12 -> 0

func (Time) CoreTime 

func (t Time) CoreTime() CoreTime

CoreTime returns core time.

func (Time) DateFormat 

func (t Time) DateFormat(layout string) (string, error)

DateFormat returns a textual representation of the time value formatted according to layout. See http://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date-format

func (Time) FillNumber 

func (t Time) FillNumber(dec *MyDecimal)

FillNumber is the same as ToNumber, but reuses input decimal instead of allocating one.

func (*Time) FromPackedUint 

func (t *Time) FromPackedUint(packed uint64) error

FromPackedUint decodes Time from a packed uint64 value.

func (Time) Fsp 

func (t Time) Fsp() int8

Fsp returns fsp value.

func (Time) InvalidZero 

func (t Time) InvalidZero() bool

InvalidZero returns a boolean indicating whether the month or day is zero.

func (Time) IsZero 

func (t Time) IsZero() bool

IsZero returns a boolean indicating whether the time is equal to ZeroCoreTime.

func (Time) RoundFrac 

func (t Time) RoundFrac(sc *stmtctx.StatementContext, fsp int8) (Time, error)

RoundFrac rounds the fraction part of a time-type value according to `fsp`.

func (*Time) SetCoreTime 

func (t *Time) SetCoreTime(ct CoreTime)

SetCoreTime updates core time.

func (*Time) SetFsp 

func (t *Time) SetFsp(fsp int8)

SetFsp updates the fsp in Time.

func (*Time) SetType 

func (t *Time) SetType(tp uint8)

SetType updates the type in Time. Only DateTime/Date/Timestamp is valid.

func (*Time) StrToDate 

func (t *Time) StrToDate(sc *stmtctx.StatementContext, date, format string) bool

StrToDate converts date string according to format. See https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_date-format

func (Time) String 

func (t Time) String() string

func (*Time) Sub 

func (t *Time) Sub(sc *stmtctx.StatementContext, t1 *Time) Duration

Sub subtracts t1 from t, returns a duration value. Note that sub should not be done on different time types.

func (Time) ToNumber 

func (t Time) ToNumber() *MyDecimal

ToNumber returns a formatted number. e.g, 2012-12-12 -> 20121212 2012-12-12T10:10:10 -> 20121212101010 2012-12-12T10:10:10.123456 -> 20121212101010.123456

func (Time) ToPackedUint 

func (t Time) ToPackedUint() (uint64, error)

ToPackedUint encodes Time to a packed uint64 value. 

 1 bit  0
17 bits year*13+month   (year 0-9999, month 0-12)
 5 bits day             (0-31)
 5 bits hour            (0-23)
 6 bits minute          (0-59)
 6 bits second          (0-59)
24 bits microseconds    (0-999999)

Total: 64 bits = 8 bytes

0YYYYYYY.YYYYYYYY.YYdddddh.hhhhmmmm.mmssssss.ffffffff.ffffffff.ffffffff

func (Time) Type 

func (t Time) Type() uint8

Type returns type value.

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