function

package
v1.0.1 Latest Latest
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 Go to latest Published: Jan 19, 2023 License: Apache-2.0 Imports: 21 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// NumBytes counts the number of bytes in a string or binary content.
	NumBytes = CountType(false)
	// NumChars counts the number of characters in a string or binary content.
	NumChars = CountType(true)
)

Variables

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var Defaults = []sql.Function{
	sql.Function1{
		Name: "count",
		Fn:   func(e sql.Expression) sql.Expression { return aggregation.NewCount(e) },
	},
	sql.Function1{
		Name: "min",
		Fn:   func(e sql.Expression) sql.Expression { return aggregation.NewMin(e) },
	},
	sql.Function1{
		Name: "max",
		Fn:   func(e sql.Expression) sql.Expression { return aggregation.NewMax(e) },
	},
	sql.Function1{
		Name: "avg",
		Fn:   func(e sql.Expression) sql.Expression { return aggregation.NewAvg(e) },
	},
	sql.Function1{
		Name: "sum",
		Fn:   func(e sql.Expression) sql.Expression { return aggregation.NewSum(e) },
	},
	sql.Function1{
		Name: "first",
		Fn:   func(e sql.Expression) sql.Expression { return aggregation.NewFirst(e) },
	},
	sql.Function1{
		Name: "last",
		Fn:   func(e sql.Expression) sql.Expression { return aggregation.NewLast(e) },
	},
	sql.Function1{Name: "is_binary", Fn: NewIsBinary},
	sql.FunctionN{Name: "substring", Fn: NewSubstring},
	sql.Function3{Name: "substring_index", Fn: NewSubstringIndex},
	sql.FunctionN{Name: "mid", Fn: NewSubstring},
	sql.FunctionN{Name: "substr", Fn: NewSubstring},
	sql.Function1{Name: "date", Fn: NewDate},
	sql.Function1{Name: "year", Fn: NewYear},
	sql.Function1{Name: "month", Fn: NewMonth},
	sql.Function1{Name: "day", Fn: NewDay},
	sql.Function1{Name: "weekday", Fn: NewWeekday},
	sql.Function1{Name: "hour", Fn: NewHour},
	sql.Function1{Name: "minute", Fn: NewMinute},
	sql.Function1{Name: "second", Fn: NewSecond},
	sql.Function1{Name: "dayofweek", Fn: NewDayOfWeek},
	sql.Function1{Name: "dayofmonth", Fn: NewDay},
	sql.Function1{Name: "dayofyear", Fn: NewDayOfYear},
	sql.FunctionN{Name: "yearweek", Fn: NewYearWeek},
	sql.Function1{Name: "array_length", Fn: NewArrayLength},
	sql.Function2{Name: "split", Fn: NewSplit},
	sql.FunctionN{Name: "concat", Fn: NewConcat},
	sql.FunctionN{Name: "concat_ws", Fn: NewConcatWithSeparator},
	sql.FunctionN{Name: "coalesce", Fn: NewCoalesce},
	sql.Function1{Name: "lower", Fn: NewLower},
	sql.Function1{Name: "upper", Fn: NewUpper},
	sql.Function1{Name: "ceiling", Fn: NewCeil},
	sql.Function1{Name: "ceil", Fn: NewCeil},
	sql.Function1{Name: "floor", Fn: NewFloor},
	sql.FunctionN{Name: "round", Fn: NewRound},
	sql.Function0{Name: "connection_id", Fn: NewConnectionID},
	sql.Function1{Name: "soundex", Fn: NewSoundex},
	sql.FunctionN{Name: "json_extract", Fn: NewJSONExtract},
	sql.Function1{Name: "json_unquote", Fn: NewJSONUnquote},
	sql.Function1{Name: "ln", Fn: NewLogBaseFunc(float64(math.E))},
	sql.Function1{Name: "log2", Fn: NewLogBaseFunc(float64(2))},
	sql.Function1{Name: "log10", Fn: NewLogBaseFunc(float64(10))},
	sql.FunctionN{Name: "log", Fn: NewLog},
	sql.FunctionN{Name: "rpad", Fn: NewPadFunc(rPadType)},
	sql.FunctionN{Name: "lpad", Fn: NewPadFunc(lPadType)},
	sql.Function1{Name: "sqrt", Fn: NewSqrt},
	sql.Function2{Name: "pow", Fn: NewPower},
	sql.Function2{Name: "power", Fn: NewPower},
	sql.Function1{Name: "ltrim", Fn: NewTrimFunc(lTrimType)},
	sql.Function1{Name: "rtrim", Fn: NewTrimFunc(rTrimType)},
	sql.Function1{Name: "trim", Fn: NewTrimFunc(bTrimType)},
	sql.Function1{Name: "reverse", Fn: NewReverse},
	sql.Function2{Name: "repeat", Fn: NewRepeat},
	sql.Function3{Name: "replace", Fn: NewReplace},
	sql.Function2{Name: "ifnull", Fn: NewIfNull},
	sql.Function2{Name: "nullif", Fn: NewNullIf},
	sql.Function0{Name: "now", Fn: NewNow},
	sql.Function1{Name: "sleep", Fn: NewSleep},
	sql.Function1{Name: "to_base64", Fn: NewToBase64},
	sql.Function1{Name: "from_base64", Fn: NewFromBase64},
	sql.FunctionN{Name: "date_add", Fn: NewDateAdd},
	sql.FunctionN{Name: "date_sub", Fn: NewDateSub},
	sql.FunctionN{Name: "greatest", Fn: NewGreatest},
	sql.FunctionN{Name: "least", Fn: NewLeast},
	sql.Function1{Name: "length", Fn: NewLength},
	sql.Function1{Name: "char_length", Fn: NewCharLength},
	sql.Function1{Name: "character_length", Fn: NewCharLength},
	sql.Function1{Name: "explode", Fn: NewExplode},
	sql.FunctionN{Name: "regexp_matches", Fn: NewRegexpMatches},
}

Defaults is the function map with all the default functions.

View Source 
var ErrConcatArrayWithOthers = errors.NewKind("can't concat a string array with any other elements")

ErrConcatArrayWithOthers is returned when there are more than 1 argument in concat and any of them is an array.

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var ErrDivisionByZero = errors.NewKind("division by zero")
View Source 
var ErrInvalidArgumentForLogarithm = errors.NewKind("invalid argument value for logarithm: %v")

ErrInvalidArgumentForLogarithm is returned when an invalid argument value is passed to a logarithm function

View Source 
var ErrNegativeRepeatCount = errors.NewKind("negative Repeat count: %v")
View Source 
var ErrUintOverflow = errors.NewKind(
	"Unsigned integer too big to fit on signed integer")
View Source 
var ErrUnsupportedType = errors.NewKind("unsupported type for greatest/latest argument: %T")

ErrUnsupportedType is returned when an argument to Greatest or Latest is not numeric or string

Functions

func NewArrayLength 

func NewArrayLength(array sql.Expression) sql.Expression

NewArrayLength creates a new ArrayLength UDF.

func NewCeil 

func NewCeil(num sql.Expression) sql.Expression

NewCeil creates a new Ceil expression.

func NewCharLength 

func NewCharLength(e sql.Expression) sql.Expression

NewCharLength returns a new CHAR_LENGTH function.

func NewCoalesce 

func NewCoalesce(args ...sql.Expression) (sql.Expression, error)

NewCoalesce creates a new Coalesce sql.Expression.

func NewConcat 

func NewConcat(args ...sql.Expression) (sql.Expression, error)

NewConcat creates a new Concat UDF.

func NewConcatWithSeparator 

func NewConcatWithSeparator(args ...sql.Expression) (sql.Expression, error)

NewConcatWithSeparator creates a new NewConcatWithSeparator UDF.

func NewConnectionID 

func NewConnectionID() sql.Expression

NewConnectionID creates a new ConnectionID UDF node.

func NewDatabase 

func NewDatabase(c *sql.Catalog) func() sql.Expression

NewDatabase returns a new Database function

func NewDate 

func NewDate(date sql.Expression) sql.Expression

NewDate returns a new Date node.

func NewDateAdd 

func NewDateAdd(args ...sql.Expression) (sql.Expression, error)

NewDateAdd creates a new date add function.

func NewDateSub 

func NewDateSub(args ...sql.Expression) (sql.Expression, error)

NewDateSub creates a new date add function.

func NewDay 

func NewDay(date sql.Expression) sql.Expression

NewDay creates a new Day UDF.

func NewDayOfWeek 

func NewDayOfWeek(date sql.Expression) sql.Expression

NewDayOfWeek creates a new DayOfWeek UDF.

func NewDayOfYear 

func NewDayOfYear(date sql.Expression) sql.Expression

NewDayOfYear creates a new DayOfYear UDF.

func NewExplode 

func NewExplode(child sql.Expression) sql.Expression

NewExplode creates a new Explode function.

func NewFloor 

func NewFloor(num sql.Expression) sql.Expression

NewFloor returns a new Floor expression.

func NewFromBase64 

func NewFromBase64(e sql.Expression) sql.Expression

NewFromBase64 creates a new FromBase64 expression.

func NewGenerate 

func NewGenerate(child sql.Expression) sql.Expression

NewGenerate creates a new Generate function.

func NewGreatest 

func NewGreatest(args ...sql.Expression) (sql.Expression, error)

NewGreatest creates a new Greatest UDF

func NewHour 

func NewHour(date sql.Expression) sql.Expression

NewHour creates a new Hour UDF.

func NewIfNull 

func NewIfNull(ex, value sql.Expression) sql.Expression

NewIfNull returns a new IFNULL UDF

func NewIsBinary 

func NewIsBinary(e sql.Expression) sql.Expression

NewIsBinary creates a new IsBinary expression.

func NewJSONExtract 

func NewJSONExtract(args ...sql.Expression) (sql.Expression, error)

NewJSONExtract creates a new JSONExtract UDF.

func NewJSONUnquote 

func NewJSONUnquote(json sql.Expression) sql.Expression

NewJSONUnquote creates a new JSONUnquote UDF.

func NewLeast 

func NewLeast(args ...sql.Expression) (sql.Expression, error)

NewLeast creates a new Least UDF

func NewLength 

func NewLength(e sql.Expression) sql.Expression

NewLength returns a new LENGTH function.

func NewLog 

func NewLog(args ...sql.Expression) (sql.Expression, error)

NewLog creates a new Log expression.

func NewLogBase 

func NewLogBase(base float64, e sql.Expression) sql.Expression

NewLogBase creates a new LogBase expression.

func NewLogBaseFunc 

func NewLogBaseFunc(base float64) func(e sql.Expression) sql.Expression

NewLogBaseFunc returns LogBase creator function with a specific base.

func NewLower 

func NewLower(e sql.Expression) sql.Expression

NewLower creates a new Lower expression.

func NewMinute 

func NewMinute(date sql.Expression) sql.Expression

NewMinute creates a new Minute UDF.

func NewMonth 

func NewMonth(date sql.Expression) sql.Expression

NewMonth creates a new Month UDF.

func NewNow 

func NewNow() sql.Expression

NewNow returns a new Now node.

func NewNullIf 

func NewNullIf(ex1, ex2 sql.Expression) sql.Expression

NewNullIf returns a new NULLIF UDF

func NewPad 

func NewPad(pType padType, args ...sql.Expression) (sql.Expression, error)

NewPad creates a new Pad expression.

func NewPadFunc 

func NewPadFunc(pType padType) func(e ...sql.Expression) (sql.Expression, error)

NewPadFunc returns a Pad creator function with a specific padType.

func NewPower 

func NewPower(e1, e2 sql.Expression) sql.Expression

NewPower creates a new Power expression.

func NewRegexpMatches 

func NewRegexpMatches(args ...sql.Expression) (sql.Expression, error)

NewRegexpMatches creates a new RegexpMatches expression.

func NewRepeat 

func NewRepeat(str sql.Expression, count sql.Expression) sql.Expression

NewRepeat creates a new Repeat expression.

func NewReplace 

func NewReplace(str sql.Expression, fromStr sql.Expression, toStr sql.Expression) sql.Expression

NewReplace creates a new Replace expression.

func NewReverse 

func NewReverse(e sql.Expression) sql.Expression

NewReverse creates a new Reverse expression.

func NewRound 

func NewRound(args ...sql.Expression) (sql.Expression, error)

NewRound returns a new Round expression.

func NewSecond 

func NewSecond(date sql.Expression) sql.Expression

NewSecond creates a new Second UDF.

func NewSleep 

func NewSleep(e sql.Expression) sql.Expression

NewSleep creates a new Sleep expression.

func NewSoundex 

func NewSoundex(e sql.Expression) sql.Expression

NewSoundex creates a new Soundex expression.

func NewSplit 

func NewSplit(str, delimiter sql.Expression) sql.Expression

NewSplit creates a new Split UDF.

func NewSqrt 

func NewSqrt(e sql.Expression) sql.Expression

NewSqrt creates a new Sqrt expression.

func NewSubstring 

func NewSubstring(args ...sql.Expression) (sql.Expression, error)

NewSubstring creates a new substring UDF.

func NewSubstringIndex 

func NewSubstringIndex(str, delim, count sql.Expression) sql.Expression

NewSubstringIndex creates a new SubstringIndex UDF.

func NewToBase64 

func NewToBase64(e sql.Expression) sql.Expression

NewToBase64 creates a new ToBase64 expression.

func NewTrim 

func NewTrim(tType trimType, str sql.Expression) sql.Expression

NewTrim creates a new Trim expression.

func NewTrimFunc 

func NewTrimFunc(tType trimType) func(e sql.Expression) sql.Expression

NewTrimFunc returns a Trim creator function with a specific trimType.

func NewUpper 

func NewUpper(e sql.Expression) sql.Expression

NewUpper creates a new Lower expression.

func NewVersion 

func NewVersion(versionPostfix string) func(...sql.Expression) (sql.Expression, error)

NewVersion creates a new Version UDF.

func NewWeekday 

func NewWeekday(date sql.Expression) sql.Expression

NewWeekday creates a new Weekday UDF.

func NewYear 

func NewYear(date sql.Expression) sql.Expression

NewYear creates a new Year UDF.

func NewYearWeek 

func NewYearWeek(args ...sql.Expression) (sql.Expression, error)

NewYearWeek creates a new YearWeek UDF

Types

type ArrayLength 

type ArrayLength struct {
	expression.UnaryExpression
}

ArrayLength returns the length of an array.

func (*ArrayLength) Eval 

func (f *ArrayLength) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*ArrayLength) String 

func (f *ArrayLength) String() string

func (*ArrayLength) Type 

func (*ArrayLength) Type() sql.Type

Type implements the Expression interface.

func (*ArrayLength) WithChildren 

func (f *ArrayLength) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Ceil 

type Ceil struct {
	expression.UnaryExpression
}

Ceil returns the smallest integer value not less than X.

func (*Ceil) Eval 

func (c *Ceil) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Ceil) String 

func (c *Ceil) String() string

func (*Ceil) Type 

func (c *Ceil) Type() sql.Type

Type implements the Expression interface.

func (*Ceil) WithChildren 

func (c *Ceil) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Coalesce 

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

Coalesce returns the first non-NULL value in the list, or NULL if there are no non-NULL values.

func (*Coalesce) Children 

func (c *Coalesce) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*Coalesce) Eval 

func (c *Coalesce) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the sql.Expression interface. The function evaluates the first non-nil argument. If the value is nil, then we keep going, otherwise we return the first non-nil value.

func (*Coalesce) IsNullable 

func (c *Coalesce) IsNullable() bool

IsNullable implements the sql.Expression interface. Returns true if all arguments are nil or of the first non-nil argument is nullable, otherwise false.

func (*Coalesce) Resolved 

func (c *Coalesce) Resolved() bool

Resolved implements the sql.Expression interface. The function checks if first non-nil argument is resolved.

func (*Coalesce) String 

func (c *Coalesce) String() string

func (*Coalesce) Type 

func (c *Coalesce) Type() sql.Type

Type implements the sql.Expression interface. The return type of Type() is the aggregated type of the argument types.

func (*Coalesce) WithChildren 

func (*Coalesce) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Concat 

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

Concat joins several strings together.

func (*Concat) Children 

func (f *Concat) Children() []sql.Expression

Children implements the Expression interface.

func (*Concat) Eval 

func (f *Concat) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Concat) IsNullable 

func (f *Concat) IsNullable() bool

IsNullable implements the Expression interface.

func (*Concat) Resolved 

func (f *Concat) Resolved() bool

Resolved implements the Expression interface.

func (*Concat) String 

func (f *Concat) String() string

func (*Concat) Type 

func (f *Concat) Type() sql.Type

Type implements the Expression interface.

func (*Concat) WithChildren 

func (*Concat) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type ConcatWithSeparator 

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

ConcatWithSeparator joins several strings together. The first argument is the separator for the rest of the arguments. The separator is added between the strings to be concatenated. The separator can be a string, as can the rest of the arguments. If the separator is NULL, the result is NULL.

func (*ConcatWithSeparator) Children 

func (f *ConcatWithSeparator) Children() []sql.Expression

Children implements the Expression interface.

func (*ConcatWithSeparator) Eval 

func (f *ConcatWithSeparator) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*ConcatWithSeparator) IsNullable 

func (f *ConcatWithSeparator) IsNullable() bool

IsNullable implements the Expression interface.

func (*ConcatWithSeparator) Resolved 

func (f *ConcatWithSeparator) Resolved() bool

Resolved implements the Expression interface.

func (*ConcatWithSeparator) String 

func (f *ConcatWithSeparator) String() string

func (*ConcatWithSeparator) Type 

func (f *ConcatWithSeparator) Type() sql.Type

Type implements the Expression interface.

func (*ConcatWithSeparator) WithChildren 

func (*ConcatWithSeparator) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type ConnectionID 

type ConnectionID struct{}

ConnectionID returns the current connection id.

func (ConnectionID) Children 

func (ConnectionID) Children() []sql.Expression

Children implements the sql.Expression interface.

func (ConnectionID) Eval 

func (ConnectionID) Eval(ctx *sql.Context, _ sql.Row) (interface{}, error)

Eval implements the sql.Expression interface.

func (ConnectionID) IsNullable 

func (ConnectionID) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (ConnectionID) Resolved 

func (ConnectionID) Resolved() bool

Resolved implements the sql.Expression interface.

func (ConnectionID) String 

func (ConnectionID) String() string

String implements the fmt.Stringer interface.

func (ConnectionID) Type 

func (ConnectionID) Type() sql.Type

Type implements the sql.Expression interface.

func (ConnectionID) WithChildren 

func (c ConnectionID) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type CountType 

type CountType bool

CountType is the kind of length count.

type Database 

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

Database stands for DATABASE() function

func (*Database) Children 

func (db *Database) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*Database) Eval 

func (db *Database) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the sql.Expression interface.

func (*Database) IsNullable 

func (db *Database) IsNullable() bool

IsNullable implements the sql.Expression interface. The function returns always true

func (*Database) Resolved 

func (db *Database) Resolved() bool

Resolved implements the sql.Expression interface.

func (*Database) String 

func (*Database) String() string

func (*Database) Type 

func (db *Database) Type() sql.Type

Type implements the sql.Expression (sql.Text)

func (*Database) WithChildren 

func (d *Database) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Date 

type Date struct {
	expression.UnaryExpression
}

Date a function takes the DATE part out from a datetime expression.

func (*Date) Eval 

func (d *Date) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Date) String 

func (d *Date) String() string

func (*Date) Type 

func (d *Date) Type() sql.Type

Type implements the Expression interface.

func (*Date) WithChildren 

func (d *Date) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type DateAdd 

type DateAdd struct {
	Date     sql.Expression
	Interval *expression.Interval
}

DateAdd adds an interval to a date.

func (*DateAdd) Children 

func (d *DateAdd) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*DateAdd) Eval 

func (d *DateAdd) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the sql.Expression interface.

func (*DateAdd) IsNullable 

func (d *DateAdd) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*DateAdd) Resolved 

func (d *DateAdd) Resolved() bool

Resolved implements the sql.Expression interface.

func (*DateAdd) String 

func (d *DateAdd) String() string

func (*DateAdd) Type 

func (d *DateAdd) Type() sql.Type

Type implements the sql.Expression interface.

func (*DateAdd) WithChildren 

func (d *DateAdd) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type DateSub 

type DateSub struct {
	Date     sql.Expression
	Interval *expression.Interval
}

DateSub subtracts an interval from a date.

func (*DateSub) Children 

func (d *DateSub) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*DateSub) Eval 

func (d *DateSub) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the sql.Expression interface.

func (*DateSub) IsNullable 

func (d *DateSub) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*DateSub) Resolved 

func (d *DateSub) Resolved() bool

Resolved implements the sql.Expression interface.

func (*DateSub) String 

func (d *DateSub) String() string

func (*DateSub) Type 

func (d *DateSub) Type() sql.Type

Type implements the sql.Expression interface.

func (*DateSub) WithChildren 

func (d *DateSub) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Day 

type Day struct {
	expression.UnaryExpression
}

Day is a function that returns the day of a date.

func (*Day) Eval 

func (d *Day) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Day) String 

func (d *Day) String() string

func (*Day) Type 

func (d *Day) Type() sql.Type

Type implements the Expression interface.

func (*Day) WithChildren 

func (d *Day) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type DayOfWeek 

type DayOfWeek struct {
	expression.UnaryExpression
}

DayOfWeek is a function that returns the day of the week from a date where 1 = Sunday, ..., 7 = Saturday.

func (*DayOfWeek) Eval 

func (d *DayOfWeek) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*DayOfWeek) String 

func (d *DayOfWeek) String() string

func (*DayOfWeek) Type 

func (d *DayOfWeek) Type() sql.Type

Type implements the Expression interface.

func (*DayOfWeek) WithChildren 

func (d *DayOfWeek) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type DayOfYear 

type DayOfYear struct {
	expression.UnaryExpression
}

DayOfYear is a function that returns the day of the year from a date.

func (*DayOfYear) Eval 

func (d *DayOfYear) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*DayOfYear) String 

func (d *DayOfYear) String() string

func (*DayOfYear) Type 

func (d *DayOfYear) Type() sql.Type

Type implements the Expression interface.

func (*DayOfYear) WithChildren 

func (d *DayOfYear) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Explode 

type Explode struct {
	Child sql.Expression
}

Explode is a function that generates a row for each value of its child. It is a placeholder expression node.

func (*Explode) Children 

func (e *Explode) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*Explode) Eval 

func (e *Explode) Eval(*sql.Context, sql.Row) (interface{}, error)

Eval implements the sql.Expression interface.

func (*Explode) IsNullable 

func (e *Explode) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*Explode) Resolved 

func (e *Explode) Resolved() bool

Resolved implements the sql.Expression interface.

func (*Explode) String 

func (e *Explode) String() string

func (*Explode) Type 

func (e *Explode) Type() sql.Type

Type implements the sql.Expression interface.

func (*Explode) WithChildren 

func (e *Explode) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Floor 

type Floor struct {
	expression.UnaryExpression
}

Floor returns the biggest integer value not less than X.

func (*Floor) Eval 

func (f *Floor) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Floor) String 

func (f *Floor) String() string

func (*Floor) Type 

func (f *Floor) Type() sql.Type

Type implements the Expression interface.

func (*Floor) WithChildren 

func (f *Floor) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type FromBase64 

type FromBase64 struct {
	expression.UnaryExpression
}

FromBase64 is a function to decode a Base64-formatted string using the same dialect that MySQL's FROM_BASE64 uses

func (*FromBase64) Eval 

func (t *FromBase64) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*FromBase64) IsNullable 

func (t *FromBase64) IsNullable() bool

IsNullable implements the Expression interface.

func (*FromBase64) String 

func (t *FromBase64) String() string

String implements the Stringer interface.

func (*FromBase64) Type 

func (t *FromBase64) Type() sql.Type

Type implements the Expression interface.

func (*FromBase64) WithChildren 

func (t *FromBase64) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Generate 

type Generate struct {
	Child sql.Expression
}

Generate is a function that generates a row for each value of its child. This is the non-placeholder counterpart of Explode.

func (*Generate) Children 

func (e *Generate) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*Generate) Eval 

func (e *Generate) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the sql.Expression interface.

func (*Generate) IsNullable 

func (e *Generate) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*Generate) Resolved 

func (e *Generate) Resolved() bool

Resolved implements the sql.Expression interface.

func (*Generate) String 

func (e *Generate) String() string

func (*Generate) Type 

func (e *Generate) Type() sql.Type

Type implements the sql.Expression interface.

func (*Generate) WithChildren 

func (e *Generate) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Greatest 

type Greatest struct {
	Args []sql.Expression
	// contains filtered or unexported fields
}

Greatest returns the argument with the greatest numerical or string value. It allows for numeric (ints anf floats) and string arguments and will return the used type when all arguments are of the same type or floats if there are numerically convertible strings or integers mixed with floats. When ints or floats are mixed with non numerically convertible strings, those are ignored.

func (*Greatest) Children 

func (f *Greatest) Children() []sql.Expression

Children implements the Expression interface.

func (*Greatest) Eval 

func (f *Greatest) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Greatest) IsNullable 

func (f *Greatest) IsNullable() bool

IsNullable implements the Expression interface.

func (*Greatest) Resolved 

func (f *Greatest) Resolved() bool

Resolved implements the Expression interface.

func (*Greatest) String 

func (f *Greatest) String() string

func (*Greatest) Type 

func (f *Greatest) Type() sql.Type

Type implements the Expression interface.

func (*Greatest) WithChildren 

func (f *Greatest) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Hour 

type Hour struct {
	expression.UnaryExpression
}

Hour is a function that returns the hour of a date.

func (*Hour) Eval 

func (h *Hour) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Hour) String 

func (h *Hour) String() string

func (*Hour) Type 

func (h *Hour) Type() sql.Type

Type implements the Expression interface.

func (*Hour) WithChildren 

func (h *Hour) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type IfNull 

type IfNull struct {
	expression.BinaryExpression
}

IfNull function returns the specified value IF the expression is NULL, otherwise return the expression.

func (*IfNull) Eval 

func (f *IfNull) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*IfNull) IsNullable 

func (f *IfNull) IsNullable() bool

IsNullable implements the Expression interface.

func (*IfNull) String 

func (f *IfNull) String() string

func (*IfNull) Type 

func (f *IfNull) Type() sql.Type

Type implements the Expression interface.

func (*IfNull) WithChildren 

func (f *IfNull) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type IsBinary 

type IsBinary struct {
	expression.UnaryExpression
}

IsBinary is a function that returns whether a blob is binary or not.

func (*IsBinary) Eval 

func (ib *IsBinary) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*IsBinary) String 

func (ib *IsBinary) String() string

func (*IsBinary) Type 

func (ib *IsBinary) Type() sql.Type

Type implements the Expression interface.

func (*IsBinary) WithChildren 

func (ib *IsBinary) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type JSONExtract 

type JSONExtract struct {
	JSON  sql.Expression
	Paths []sql.Expression
}

JSONExtract extracts data from a json document using json paths.

func (*JSONExtract) Children 

func (j *JSONExtract) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*JSONExtract) Eval 

func (j *JSONExtract) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the sql.Expression interface.

func (*JSONExtract) IsNullable 

func (j *JSONExtract) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*JSONExtract) Resolved 

func (j *JSONExtract) Resolved() bool

Resolved implements the sql.Expression interface.

func (*JSONExtract) String 

func (j *JSONExtract) String() string

func (*JSONExtract) Type 

func (j *JSONExtract) Type() sql.Type

Type implements the sql.Expression interface.

func (*JSONExtract) WithChildren 

func (j *JSONExtract) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type JSONUnquote 

type JSONUnquote struct {
	expression.UnaryExpression
}

JSONUnquote unquotes JSON value and returns the result as a utf8mb4 string. Returns NULL if the argument is NULL. An error occurs if the value starts and ends with double quotes but is not a valid JSON string literal.

func (*JSONUnquote) Eval 

func (js *JSONUnquote) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*JSONUnquote) String 

func (js *JSONUnquote) String() string

func (*JSONUnquote) Type 

func (*JSONUnquote) Type() sql.Type

Type implements the Expression interface.

func (*JSONUnquote) WithChildren 

func (js *JSONUnquote) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Least 

type Least struct {
	Args []sql.Expression
	// contains filtered or unexported fields
}

Least returns the argument with the least numerical or string value. It allows for numeric (ints anf floats) and string arguments and will return the used type when all arguments are of the same type or floats if there are numerically convertible strings or integers mixed with floats. When ints or floats are mixed with non numerically convertible strings, those are ignored.

func (*Least) Children 

func (f *Least) Children() []sql.Expression

Children implements the Expression interface.

func (*Least) Eval 

func (f *Least) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Least) IsNullable 

func (f *Least) IsNullable() bool

IsNullable implements the Expression interface.

func (*Least) Resolved 

func (f *Least) Resolved() bool

Resolved implements the Expression interface.

func (*Least) String 

func (f *Least) String() string

func (*Least) Type 

func (f *Least) Type() sql.Type

Type implements the Expression interface.

func (*Least) WithChildren 

func (f *Least) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Length 

type Length struct {
	expression.UnaryExpression
	CountType CountType
}

Length returns the length of a string or binary content, either in bytes or characters.

func (*Length) Eval 

func (l *Length) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the sql.Expression interface.

func (*Length) String 

func (l *Length) String() string

func (*Length) Type 

func (l *Length) Type() sql.Type

Type implements the sql.Expression interface.

func (*Length) WithChildren 

func (l *Length) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Log 

type Log struct {
	expression.BinaryExpression
}

Log is a function that returns the natural logarithm of a value.

func (*Log) Children 

func (l *Log) Children() []sql.Expression

Children implements the Expression interface.

func (*Log) Eval 

func (l *Log) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*Log) IsNullable 

func (l *Log) IsNullable() bool

IsNullable implements the Expression interface.

func (*Log) String 

func (l *Log) String() string

func (*Log) Type 

func (l *Log) Type() sql.Type

Type returns the resultant type of the function.

func (*Log) WithChildren 

func (l *Log) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type LogBase 

type LogBase struct {
	expression.UnaryExpression
	// contains filtered or unexported fields
}

LogBase is a function that returns the logarithm of a value with a specific base.

func (*LogBase) Eval 

func (l *LogBase) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*LogBase) IsNullable 

func (l *LogBase) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*LogBase) String 

func (l *LogBase) String() string

func (*LogBase) Type 

func (l *LogBase) Type() sql.Type

Type returns the resultant type of the function.

func (*LogBase) WithChildren 

func (l *LogBase) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Lower 

type Lower struct {
	expression.UnaryExpression
}

Lower is a function that returns the lowercase of the text provided.

func (*Lower) Eval 

func (l *Lower) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*Lower) String 

func (l *Lower) String() string

func (*Lower) Type 

func (l *Lower) Type() sql.Type

Type implements the Expression interface.

func (*Lower) WithChildren 

func (l *Lower) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Minute 

type Minute struct {
	expression.UnaryExpression
}

Minute is a function that returns the minute of a date.

func (*Minute) Eval 

func (m *Minute) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Minute) String 

func (m *Minute) String() string

func (*Minute) Type 

func (m *Minute) Type() sql.Type

Type implements the Expression interface.

func (*Minute) WithChildren 

func (m *Minute) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Month 

type Month struct {
	expression.UnaryExpression
}

Month is a function that returns the month of a date.

func (*Month) Eval 

func (m *Month) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Month) String 

func (m *Month) String() string

func (*Month) Type 

func (m *Month) Type() sql.Type

Type implements the Expression interface.

func (*Month) WithChildren 

func (m *Month) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Now 

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

Now is a function that returns the current time.

func (*Now) Children 

func (*Now) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*Now) Eval 

func (n *Now) Eval(*sql.Context, sql.Row) (interface{}, error)

Eval implements the sql.Expression interface.

func (*Now) IsNullable 

func (*Now) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*Now) Resolved 

func (*Now) Resolved() bool

Resolved implements the sql.Expression interface.

func (*Now) String 

func (*Now) String() string

func (*Now) Type 

func (*Now) Type() sql.Type

Type implements the sql.Expression interface.

func (*Now) WithChildren 

func (n *Now) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type NullIf 

type NullIf struct {
	expression.BinaryExpression
}

NullIf function compares two expressions and returns NULL if they are equal. Otherwise, the first expression is returned.

func (*NullIf) Eval 

func (f *NullIf) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*NullIf) IsNullable 

func (f *NullIf) IsNullable() bool

IsNullable implements the Expression interface.

func (*NullIf) String 

func (f *NullIf) String() string

func (*NullIf) Type 

func (f *NullIf) Type() sql.Type

Type implements the Expression interface.

func (*NullIf) WithChildren 

func (f *NullIf) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Pad 

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

Pad is a function that pads a string with another string.

func (*Pad) Children 

func (p *Pad) Children() []sql.Expression

Children implements the Expression interface.

func (*Pad) Eval 

func (p *Pad) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*Pad) IsNullable 

func (p *Pad) IsNullable() bool

IsNullable implements the Expression interface.

func (*Pad) Resolved 

func (p *Pad) Resolved() bool

Resolved implements the Expression interface.

func (*Pad) String 

func (p *Pad) String() string

func (*Pad) Type 

func (p *Pad) Type() sql.Type

Type implements the Expression interface.

func (*Pad) WithChildren 

func (p *Pad) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Power 

type Power struct {
	expression.BinaryExpression
}

Power is a function that returns value of X raised to the power of Y.

func (*Power) Eval 

func (p *Power) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Power) IsNullable 

func (p *Power) IsNullable() bool

IsNullable implements the Expression interface.

func (*Power) String 

func (p *Power) String() string

func (*Power) Type 

func (p *Power) Type() sql.Type

Type implements the Expression interface.

func (*Power) WithChildren 

func (p *Power) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type RegexpMatches 

type RegexpMatches struct {
	Text    sql.Expression
	Pattern sql.Expression
	Flags   sql.Expression
	// contains filtered or unexported fields
}

RegexpMatches returns the matches of a regular expression.

func (*RegexpMatches) Children 

func (r *RegexpMatches) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*RegexpMatches) Eval 

func (r *RegexpMatches) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the sql.Expression interface.

func (*RegexpMatches) IsNullable 

func (r *RegexpMatches) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*RegexpMatches) Resolved 

func (r *RegexpMatches) Resolved() bool

Resolved implements the sql.Expression interface.

func (*RegexpMatches) String 

func (r *RegexpMatches) String() string

func (*RegexpMatches) Type 

func (r *RegexpMatches) Type() sql.Type

Type implements the sql.Expression interface.

func (*RegexpMatches) WithChildren 

func (r *RegexpMatches) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the sql.Expression interface.

type Repeat 

type Repeat struct {
	expression.BinaryExpression
}

Repeat is a function that returns the string repeated n times.

func (*Repeat) Eval 

func (r *Repeat) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*Repeat) String 

func (r *Repeat) String() string

func (*Repeat) Type 

func (r *Repeat) Type() sql.Type

Type implements the Expression interface.

func (*Repeat) WithChildren 

func (r *Repeat) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Replace 

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

Replace is a function that returns a string with all occurrences of fromStr replaced by the string toStr

func (*Replace) Children 

func (r *Replace) Children() []sql.Expression

Children implements the Expression interface.

func (*Replace) Eval 

func (r *Replace) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*Replace) IsNullable 

func (r *Replace) IsNullable() bool

IsNullable implements the Expression interface.

func (*Replace) Resolved 

func (r *Replace) Resolved() bool

Resolved implements the Expression interface.

func (*Replace) String 

func (r *Replace) String() string

func (*Replace) Type 

func (r *Replace) Type() sql.Type

Type implements the Expression interface.

func (*Replace) WithChildren 

func (r *Replace) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Reverse 

type Reverse struct {
	expression.UnaryExpression
}

Reverse is a function that returns the reverse of the text provided.

func (*Reverse) Eval 

func (r *Reverse) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*Reverse) String 

func (r *Reverse) String() string

func (*Reverse) Type 

func (r *Reverse) Type() sql.Type

Type implements the Expression interface.

func (*Reverse) WithChildren 

func (r *Reverse) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Round 

type Round struct {
	expression.BinaryExpression
}

Round returns the number (x) with (d) requested decimal places. If d is negative, the number is returned with the (abs(d)) least significant digits of it's integer part set to 0. If d is not specified or nil/null it defaults to 0.

func (*Round) Children 

func (r *Round) Children() []sql.Expression

Children implements the Expression interface.

func (*Round) Eval 

func (r *Round) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Round) IsNullable 

func (r *Round) IsNullable() bool

IsNullable implements the Expression interface.

func (*Round) Resolved 

func (r *Round) Resolved() bool

Resolved implements the Expression interface.

func (*Round) String 

func (r *Round) String() string

func (*Round) Type 

func (r *Round) Type() sql.Type

Type implements the Expression interface.

func (*Round) WithChildren 

func (r *Round) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Second 

type Second struct {
	expression.UnaryExpression
}

Second is a function that returns the second of a date.

func (*Second) Eval 

func (s *Second) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Second) String 

func (s *Second) String() string

func (*Second) Type 

func (s *Second) Type() sql.Type

Type implements the Expression interface.

func (*Second) WithChildren 

func (s *Second) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Sleep 

type Sleep struct {
	expression.UnaryExpression
}

Sleep is a function that just waits for the specified number of seconds and returns 0. It can be useful to test timeouts or long queries.

func (*Sleep) Eval 

func (s *Sleep) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Sleep) IsNullable 

func (s *Sleep) IsNullable() bool

IsNullable implements the Expression interface.

func (*Sleep) String 

func (s *Sleep) String() string

String implements the Stringer interface.

func (*Sleep) Type 

func (s *Sleep) Type() sql.Type

Type implements the Expression interface.

func (*Sleep) WithChildren 

func (s *Sleep) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Soundex 

type Soundex struct {
	expression.UnaryExpression
}

Soundex is a function that returns the soundex of a string. Two strings that sound almost the same should have identical soundex strings. A standard soundex string is four characters long, but the SOUNDEX() function returns an arbitrarily long string.

func (*Soundex) Eval 

func (s *Soundex) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Soundex) String 

func (s *Soundex) String() string

func (*Soundex) Type 

func (s *Soundex) Type() sql.Type

Type implements the Expression interface.

func (*Soundex) WithChildren 

func (s *Soundex) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Split 

type Split struct {
	expression.BinaryExpression
}

Split receives a string and returns the parts of it splitted by a delimiter.

func (*Split) Eval 

func (f *Split) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Split) IsNullable 

func (f *Split) IsNullable() bool

IsNullable implements the Expression interface.

func (*Split) String 

func (f *Split) String() string

func (*Split) Type 

func (*Split) Type() sql.Type

Type implements the Expression interface.

func (*Split) WithChildren 

func (f *Split) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Sqrt 

type Sqrt struct {
	expression.UnaryExpression
}

Sqrt is a function that returns the square value of the number provided.

func (*Sqrt) Eval 

func (s *Sqrt) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Sqrt) IsNullable 

func (s *Sqrt) IsNullable() bool

IsNullable implements the Expression interface.

func (*Sqrt) String 

func (s *Sqrt) String() string

func (*Sqrt) Type 

func (s *Sqrt) Type() sql.Type

Type implements the Expression interface.

func (*Sqrt) WithChildren 

func (s *Sqrt) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Substring 

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

Substring is a function to return a part of a string. This function behaves as the homonym MySQL function. Since Go strings are UTF8, this function does not return a direct sub string str[start:start+length], instead returns the substring of rune s. That is, "á"[0:1] does not return a partial unicode glyph, but "á" itself.

func (*Substring) Children 

func (s *Substring) Children() []sql.Expression

Children implements the Expression interface.

func (*Substring) Eval 

func (s *Substring) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*Substring) IsNullable 

func (s *Substring) IsNullable() bool

IsNullable implements the Expression interface.

func (*Substring) Resolved 

func (s *Substring) Resolved() bool

Resolved implements the Expression interface.

func (*Substring) String 

func (s *Substring) String() string

func (*Substring) Type 

func (*Substring) Type() sql.Type

Type implements the Expression interface.

func (*Substring) WithChildren 

func (*Substring) WithChildren(children ...sql.Expression) (sql.Expression, error)

/ WithChildren implements the Expression interface.

type SubstringIndex 

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

SubstringIndex returns the substring from string str before count occurrences of the delimiter delim. If count is positive, everything to the left of the final delimiter (counting from the left) is returned. If count is negative, everything to the right of the final delimiter (counting from the right) is returned. SUBSTRING_INDEX() performs a case-sensitive match when searching for delim.

func (*SubstringIndex) Children 

func (s *SubstringIndex) Children() []sql.Expression

Children implements the Expression interface.

func (*SubstringIndex) Eval 

func (s *SubstringIndex) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*SubstringIndex) IsNullable 

func (s *SubstringIndex) IsNullable() bool

IsNullable implements the Expression interface.

func (*SubstringIndex) Resolved 

func (s *SubstringIndex) Resolved() bool

Resolved implements the Expression interface.

func (*SubstringIndex) String 

func (s *SubstringIndex) String() string

func (*SubstringIndex) Type 

func (*SubstringIndex) Type() sql.Type

Type implements the Expression interface.

func (*SubstringIndex) WithChildren 

func (s *SubstringIndex) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type ToBase64 

type ToBase64 struct {
	expression.UnaryExpression
}

ToBase64 is a function to encode a string to the Base64 format using the same dialect that MySQL's TO_BASE64 uses

func (*ToBase64) Eval 

func (t *ToBase64) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*ToBase64) IsNullable 

func (t *ToBase64) IsNullable() bool

IsNullable implements the Expression interface.

func (*ToBase64) String 

func (t *ToBase64) String() string

String implements the Stringer interface.

func (*ToBase64) Type 

func (t *ToBase64) Type() sql.Type

Type implements the Expression interface.

func (*ToBase64) WithChildren 

func (t *ToBase64) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Trim 

type Trim struct {
	expression.UnaryExpression
	// contains filtered or unexported fields
}

Trim is a function that returns the string with prefix or suffix spaces removed based on the trimType

func (*Trim) Eval 

func (t *Trim) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*Trim) IsNullable 

func (t *Trim) IsNullable() bool

IsNullable implements the Expression interface.

func (*Trim) String 

func (t *Trim) String() string

func (*Trim) Type 

func (t *Trim) Type() sql.Type

Type implements the Expression interface.

func (*Trim) WithChildren 

func (t *Trim) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Upper 

type Upper struct {
	expression.UnaryExpression
}

Upper is a function that returns the UPPERCASE of the text provided.

func (*Upper) Eval 

func (u *Upper) Eval(
	ctx *sql.Context,
	row sql.Row,
) (interface{}, error)

Eval implements the Expression interface.

func (*Upper) String 

func (u *Upper) String() string

func (*Upper) Type 

func (u *Upper) Type() sql.Type

Type implements the Expression interface.

func (*Upper) WithChildren 

func (u *Upper) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Version 

type Version string

Version is a function that returns server version.

func (Version) Children 

func (f Version) Children() []sql.Expression

Children implements the Expression interface.

func (Version) Eval 

func (f Version) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (Version) IsNullable 

func (f Version) IsNullable() bool

IsNullable implements the Expression interface.

func (Version) Resolved 

func (f Version) Resolved() bool

Resolved implements the Expression interface.

func (Version) String 

func (f Version) String() string

func (Version) Type 

func (f Version) Type() sql.Type

Type implements the Expression interface.

func (Version) WithChildren 

func (f Version) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Weekday 

type Weekday struct {
	expression.UnaryExpression
}

Weekday is a function that returns the weekday of a date where 0 = Monday, ..., 6 = Sunday.

func (*Weekday) Eval 

func (d *Weekday) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Weekday) String 

func (d *Weekday) String() string

func (*Weekday) Type 

func (d *Weekday) Type() sql.Type

Type implements the Expression interface.

func (*Weekday) WithChildren 

func (d *Weekday) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Year 

type Year struct {
	expression.UnaryExpression
}

Year is a function that returns the year of a date.

func (*Year) Eval 

func (y *Year) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Year) String 

func (y *Year) String() string

func (*Year) Type 

func (y *Year) Type() sql.Type

Type implements the Expression interface.

func (*Year) WithChildren 

func (y *Year) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type YearWeek 

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

YearWeek is a function that returns year and week for a date. The year in the result may be different from the year in the date argument for the first and the last week of the year. Details: https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_yearweek

func (*YearWeek) Children 

func (d *YearWeek) Children() []sql.Expression

Children implements the Expression interface.

func (*YearWeek) Eval 

func (d *YearWeek) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*YearWeek) IsNullable 

func (d *YearWeek) IsNullable() bool

IsNullable implements the Expression interface.

func (*YearWeek) Resolved 

func (d *YearWeek) Resolved() bool

Resolved implements the Expression interface.

func (*YearWeek) String 

func (d *YearWeek) String() string

func (*YearWeek) Type 

func (d *YearWeek) Type() sql.Type

Type implements the Expression interface.

func (*YearWeek) WithChildren 

func (*YearWeek) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

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