expression

package
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 Go to latest Published: Jun 13, 2023 License: Apache-2.0 Imports: 14 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// ConvertToBinary is a conversion to binary.
	ConvertToBinary = "binary"
	// ConvertToChar is a conversion to char.
	ConvertToChar = "char"
	// ConvertToNChar is a conversion to nchar.
	ConvertToNChar = "nchar"
	// ConvertToDate is a conversion to date.
	ConvertToDate = "date"
	// ConvertToDatetime is a conversion to datetime.
	ConvertToDatetime = "datetime"
	// ConvertToDecimal is a conversion to decimal.
	ConvertToDecimal = "decimal"
	// ConvertToDouble is a conversion to double.
	ConvertToDouble = "double"
	// ConvertToJSON is a conversion to json.
	ConvertToJSON = "json"
	// ConvertToReal is a conversion to double.
	ConvertToReal = "real"
	// ConvertToSigned is a conversion to signed.
	ConvertToSigned = "signed"
	// ConvertToTime is a conversion to time.
	ConvertToTime = "time"
	// ConvertToUnsigned is a conversion to unsigned.
	ConvertToUnsigned = "unsigned"
)
View Source 
const IsFalseStr = "IS FALSE"
View Source 
const IsTrueStr = "IS TRUE"

Variables

View Source 
var (
	// ErrAutoIncrementUnsupported is returned when table does not support AUTO_INCREMENT.
	ErrAutoIncrementUnsupported = errors.NewKind("table %s does not support AUTO_INCREMENT columns")
	// ErrNoAutoIncrementCols is returned when table has no AUTO_INCREMENT columns.
	ErrNoAutoIncrementCols = errors.NewKind("table %s has no AUTO_INCREMENT columns")
)
View Source 
var ErrConvertExpression = errors.NewKind("expression '%v': couldn't convert to %v")

ErrConvertExpression is returned when a conversion is not possible.

View Source 
var ErrIndexOutOfBounds = errors.NewKind("unable to find field with index %d in row of %d columns")

ErrIndexOutOfBounds is returned when the field index is out of the bounds.

View Source 
var ErrInvalidRegexp = errors.NewKind("Invalid regular expression: %s")
View Source 
var ErrNilOperand = errors.NewKind("nil operand found in comparison")

ErrNilOperand ir returned if some or both of the comparison's operands is nil.

View Source 
var (
	// ErrUnsupportedInOperand is returned when there is an invalid righthand
	// operand in an IN operator.
	ErrUnsupportedInOperand = errors.NewKind("right operand in IN operation must be tuple, but is %T")
)

Functions

func Clone 

func Clone(expr sql.Expression) (sql.Expression, error)

Clone duplicates an existing sql.Expression, returning new nodes with the same structure and internal values. It can be useful when dealing with stateful expression nodes where an evaluation needs to create multiple independent histories of the internal state of the expression nodes.

func Dispose 

func Dispose(e sql.Expression)

func ExpressionToColumn 

func ExpressionToColumn(e sql.Expression) *sql.Column

ExpressionToColumn converts the expression to the form that should be used in a Schema. Expressions that have Name() and Table() methods will use these; otherwise, String() and "" are used, respectively. The type and nullability are taken from the expression directly.

func ExpressionsResolved 

func ExpressionsResolved(exprs ...sql.Expression) bool

ExpressionsResolve returns whether all the expressions in the slice given are resolved

func IsBinary 

func IsBinary(e sql.Expression) bool

IsBinary returns whether the expression is binary or not.

func IsUnary 

func IsUnary(e sql.Expression) bool

IsUnary returns whether the expression is unary or not.

func JoinAnd 

func JoinAnd(exprs ...sql.Expression) sql.Expression

JoinAnd joins several expressions with And.

func NewAnd 

func NewAnd(left, right sql.Expression) sql.Expression

NewAnd creates a new And expression.

func NewBinary 

func NewBinary(e sql.Expression) sql.Expression

func NewBindVar 

func NewBindVar(name string) sql.Expression

func NewLike 

func NewLike(left, right sql.Expression) sql.Expression

NewLike creates a new LIKE expression.

func NewNotInTuple 

func NewNotInTuple(left sql.Expression, right sql.Expression) sql.Expression

NewNotInTuple creates a new NotInTuple expression.

func NewOr 

func NewOr(left, right sql.Expression) sql.Expression

NewOr creates a new Or expression.

func NewSetField 

func NewSetField(left, expr sql.Expression) sql.Expression

NewSetField creates a new SetField expression.

func TransformUp 

func TransformUp(e sql.Expression, f sql.TransformExprFunc) (sql.Expression, error)

TransformUp applies a transformation function to the given expression from the bottom up.

func TransformUpWithNode 

func TransformUpWithNode(n sql.Node, e sql.Expression, f TransformExprWithNodeFunc) (sql.Expression, error)

TransformUpWithNode applies a transformation function to the given expression from the bottom up.

func WrapExpressions 

func WrapExpressions(exprs ...sql.Expression) []sql.Expression

WrapExpressions takes in a number of expressions and wraps each one, returning the resulting slice. Useful for when an expression in a slice may be nil.

Types

type Alias 

type Alias struct {
	UnaryExpression
	// contains filtered or unexported fields
}

Alias is a node that gives a name to an expression.

func NewAlias 

func NewAlias(name string, expr sql.Expression) *Alias

NewAlias returns a new Alias node.

func (*Alias) DebugString 

func (e *Alias) DebugString() string

func (*Alias) Eval 

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

Eval implements the Expression interface.

func (*Alias) Name 

func (e *Alias) Name() string

Name implements the Nameable interface.

func (*Alias) String 

func (e *Alias) String() string

func (*Alias) Type 

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

Type returns the type of the expression.

func (*Alias) WithChildren 

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

WithChildren implements the Expression interface.

type And 

type And struct {
	BinaryExpression
}

And checks whether two expressions are true.

func (*And) DebugString 

func (a *And) DebugString() string

func (*And) Eval 

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

Eval implements the Expression interface.

func (*And) String 

func (a *And) String() string

func (*And) Type 

func (*And) Type() sql.Type

Type implements the Expression interface.

func (*And) WithChildren 

func (a *And) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Arithmetic 

type Arithmetic struct {
	BinaryExpression
	Op string
}

Arithmetic expressions (+, -, *, /, ...)

func NewArithmetic 

func NewArithmetic(left, right sql.Expression, op string) *Arithmetic

NewArithmetic creates a new Arithmetic sql.Expression.

func NewBitAnd 

func NewBitAnd(left, right sql.Expression) *Arithmetic

NewBitAnd creates a new Arithmetic & sql.Expression.

func NewBitOr 

func NewBitOr(left, right sql.Expression) *Arithmetic

NewBitOr creates a new Arithmetic | sql.Expression.

func NewBitXor 

func NewBitXor(left, right sql.Expression) *Arithmetic

NewBitXor creates a new Arithmetic ^ sql.Expression.

func NewDiv 

func NewDiv(left, right sql.Expression) *Arithmetic

NewDiv creates a new Arithmetic / sql.Expression.

func NewIncrement 

func NewIncrement(left sql.Expression) *Arithmetic

func NewIntDiv 

func NewIntDiv(left, right sql.Expression) *Arithmetic

NewIntDiv creates a new Arithmetic div sql.Expression.

func NewMinus 

func NewMinus(left, right sql.Expression) *Arithmetic

NewMinus creates a new Arithmetic - sql.Expression.

func NewMod 

func NewMod(left, right sql.Expression) *Arithmetic

NewMod creates a new Arithmetic % sql.Expression.

func NewMult 

func NewMult(left, right sql.Expression) *Arithmetic

NewMult creates a new Arithmetic * sql.Expression.

func NewPlus 

func NewPlus(left, right sql.Expression) *Arithmetic

NewPlus creates a new Arithmetic + sql.Expression.

func NewShiftLeft 

func NewShiftLeft(left, right sql.Expression) *Arithmetic

NewShiftLeft creates a new Arithmetic << sql.Expression.

func NewShiftRight 

func NewShiftRight(left, right sql.Expression) *Arithmetic

NewShiftRight creates a new Arithmetic >> sql.Expression.

func (*Arithmetic) DebugString 

func (a *Arithmetic) DebugString() string

func (*Arithmetic) Eval 

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

Eval implements the Expression interface.

func (*Arithmetic) IsNullable 

func (a *Arithmetic) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*Arithmetic) String 

func (a *Arithmetic) String() string

func (*Arithmetic) Type 

func (a *Arithmetic) Type() sql.Type

Type returns the greatest type for given operation.

func (*Arithmetic) WithChildren 

func (a *Arithmetic) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type AutoIncrement 

type AutoIncrement struct {
	UnaryExpression
	// contains filtered or unexported fields
}

AutoIncrement implements AUTO_INCREMENT

func NewAutoIncrement 

func NewAutoIncrement(ctx *sql.Context, table sql.Table, given sql.Expression) (*AutoIncrement, error)

NewAutoIncrement creates a new AutoIncrement expression.

func (*AutoIncrement) Children 

func (i *AutoIncrement) Children() []sql.Expression

Children implements the Expression interface.

func (*AutoIncrement) Eval 

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

Eval implements the Expression interface.

func (*AutoIncrement) IsNullable 

func (i *AutoIncrement) IsNullable() bool

IsNullable implements the Expression interface.

func (*AutoIncrement) String 

func (i *AutoIncrement) String() string

func (*AutoIncrement) Type 

func (i *AutoIncrement) Type() sql.Type

Type implements the Expression interface.

func (*AutoIncrement) WithChildren 

func (i *AutoIncrement) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Between 

type Between struct {
	Val   sql.Expression
	Lower sql.Expression
	Upper sql.Expression
}

Between checks a value is between two given values.

func NewBetween 

func NewBetween(val, lower, upper sql.Expression) *Between

NewBetween creates a new Between expression.

func (*Between) Children 

func (b *Between) Children() []sql.Expression

Children implements the Expression interface.

func (*Between) DebugString 

func (b *Between) DebugString() string

func (*Between) Eval 

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

Eval implements the Expression interface.

func (*Between) IsNullable 

func (b *Between) IsNullable() bool

IsNullable implements the Expression interface.

func (*Between) Resolved 

func (b *Between) Resolved() bool

Resolved implements the Expression interface.

func (*Between) String 

func (b *Between) String() string

func (*Between) Type 

func (*Between) Type() sql.Type

Type implements the Expression interface.

func (*Between) WithChildren 

func (b *Between) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Binary 

type Binary struct {
	UnaryExpression
}

The BINARY operator converts the expression to a binary string (a string that has the binary character set and binary collation). A common use for BINARY is to force a character string comparison to be done byte by byte using numeric byte values rather than character by character. The BINARY operator also causes trailing spaces in comparisons to be significant.

cc: https://dev.mysql.com/doc/refman/8.0/en/cast-functions.html#operator_binary

func (*Binary) Eval 

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

func (*Binary) String 

func (b *Binary) String() string

func (*Binary) Type 

func (b *Binary) Type() sql.Type

func (*Binary) WithChildren 

func (b *Binary) WithChildren(children ...sql.Expression) (sql.Expression, error)

type BinaryExpression 

type BinaryExpression struct {
	Left  sql.Expression
	Right sql.Expression
}

BinaryExpression is an expression that has two children.

func (*BinaryExpression) Children 

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

Children implements the Expression interface.

func (*BinaryExpression) IsNullable 

func (p *BinaryExpression) IsNullable() bool

IsNullable returns whether the expression can be null.

func (*BinaryExpression) Resolved 

func (p *BinaryExpression) Resolved() bool

Resolved implements the Expression interface.

type BindVar 

type BindVar struct {
	Name string
}

func (*BindVar) Children 

func (bv *BindVar) Children() []sql.Expression

func (*BindVar) Eval 

func (bv *BindVar) Eval(*sql.Context, sql.Row) (interface{}, error)

func (*BindVar) IsNullable 

func (bv *BindVar) IsNullable() bool

func (*BindVar) Resolved 

func (bv *BindVar) Resolved() bool

func (*BindVar) String 

func (bv *BindVar) String() string

func (*BindVar) Type 

func (bv *BindVar) Type() sql.Type

func (*BindVar) WithChildren 

func (bv *BindVar) WithChildren(children ...sql.Expression) (sql.Expression, error)

type Case 

type Case struct {
	Expr     sql.Expression
	Branches []CaseBranch
	Else     sql.Expression
}

Case is an expression that returns the value of one of its branches when a condition is met.

func NewCase 

func NewCase(expr sql.Expression, branches []CaseBranch, elseExpr sql.Expression) *Case

NewCase returns an new Case expression.

func (*Case) Children 

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

Children implements the sql.Expression interface.

func (*Case) DebugString 

func (c *Case) DebugString() string

func (*Case) Eval 

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

Eval implements the sql.Expression interface.

func (*Case) IsNullable 

func (c *Case) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*Case) Resolved 

func (c *Case) Resolved() bool

Resolved implements the sql.Expression interface.

func (*Case) String 

func (c *Case) String() string

func (*Case) Type 

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

Type implements the sql.Expression interface.

func (*Case) WithChildren 

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

WithChildren implements the Expression interface.

type CaseBranch 

type CaseBranch struct {
	Cond  sql.Expression
	Value sql.Expression
}

CaseBranch is a single branch of a case expression.

type Comparer 

type Comparer interface {
	sql.Expression
	Compare(ctx *sql.Context, row sql.Row) (int, error)
	Left() sql.Expression
	Right() sql.Expression
}

Comparer implements a comparison expression.

type Convert 

type Convert struct {
	UnaryExpression
	// contains filtered or unexported fields
}

Convert represent a CAST(x AS T) or CONVERT(x, T) operation that casts x expression to type T.

func NewConvert 

func NewConvert(expr sql.Expression, castToType string) *Convert

NewConvert creates a new Convert expression.

func (*Convert) Eval 

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

Eval implements the Expression interface.

func (*Convert) IsNullable 

func (c *Convert) IsNullable() bool

IsNullable implements the Expression interface.

func (*Convert) String 

func (c *Convert) String() string

Name implements the Expression interface.

func (*Convert) Type 

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

Type implements the Expression interface.

func (*Convert) WithChildren 

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

WithChildren implements the Expression interface.

type DefaultColumn 

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

DefaultColumn is an default expression of a column that is not yet resolved.

func NewDefaultColumn 

func NewDefaultColumn(name string) *DefaultColumn

NewDefaultColumn creates a new NewDefaultColumn expression.

func (*DefaultColumn) Children 

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

Children implements the sql.Expression interface. The function returns always nil

func (*DefaultColumn) Eval 

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

Eval implements the sql.Expression interface. The function always panics!

func (*DefaultColumn) IsNullable 

func (*DefaultColumn) IsNullable() bool

IsNullable implements the sql.Expression interface. The function always panics!

func (*DefaultColumn) Name 

func (c *DefaultColumn) Name() string

Name implements the sql.Nameable interface.

func (*DefaultColumn) Resolved 

func (*DefaultColumn) Resolved() bool

Resolved implements the sql.Expression interface. The function returns always false

func (*DefaultColumn) String 

func (c *DefaultColumn) String() string

String implements the Stringer The function returns column's name (can be an empty string)

func (*DefaultColumn) Type 

func (*DefaultColumn) Type() sql.Type

Type implements the sql.Expression interface. The function always panics!

func (*DefaultColumn) WithChildren 

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

WithChildren implements the Expression interface.

type DistinctExpression 

type DistinctExpression struct {
	Child sql.Expression
	// contains filtered or unexported fields
}

func NewDistinctExpression 

func NewDistinctExpression(e sql.Expression) *DistinctExpression

func (*DistinctExpression) Children 

func (de *DistinctExpression) Children() []sql.Expression

func (*DistinctExpression) Dispose 

func (de *DistinctExpression) Dispose()

func (*DistinctExpression) Eval 

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

Returns the child value if the cache hasn't seen the value before otherwise returns nil. Since NULLs are ignored in aggregate expressions that use DISTINCT this is a valid return scheme.

func (*DistinctExpression) IsNullable 

func (de *DistinctExpression) IsNullable() bool

func (*DistinctExpression) Resolved 

func (de *DistinctExpression) Resolved() bool

func (*DistinctExpression) String 

func (de *DistinctExpression) String() string

func (*DistinctExpression) Type 

func (de *DistinctExpression) Type() sql.Type

func (*DistinctExpression) WithChildren 

func (de *DistinctExpression) WithChildren(children ...sql.Expression) (sql.Expression, error)

type Equals 

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

Equals is a comparison that checks an expression is equal to another.

func NewEquals 

func NewEquals(left sql.Expression, right sql.Expression) *Equals

NewEquals returns a new Equals expression.

func (*Equals) Compare 

func (c *Equals) Compare(ctx *sql.Context, row sql.Row) (int, error)

Compare the two given values using the types of the expressions in the comparison. Since both types should be equal, it does not matter which type is used, but for reference, the left type is always used.

func (*Equals) DebugString 

func (e *Equals) DebugString() string

func (*Equals) Eval 

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

Eval implements the Expression interface.

func (*Equals) Left 

func (c *Equals) Left() sql.Expression

Left implements Comparer interface

func (*Equals) Right 

func (c *Equals) Right() sql.Expression

Right implements Comparer interface

func (*Equals) String 

func (e *Equals) String() string

func (*Equals) Type 

func (*Equals) Type() sql.Type

Type implements the Expression interface.

func (*Equals) WithChildren 

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

WithChildren implements the Expression interface.

type GetField 

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

GetField is an expression to get the field of a table.

func NewGetField 

func NewGetField(index int, fieldType sql.Type, fieldName string, nullable bool) *GetField

NewGetField creates a GetField expression.

func NewGetFieldWithTable 

func NewGetFieldWithTable(index int, fieldType sql.Type, table, fieldName string, nullable bool) *GetField

NewGetFieldWithTable creates a GetField expression with table name. The table name may be an alias.

func (*GetField) Children 

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

Children implements the Expression interface.

func (*GetField) DebugString 

func (p *GetField) DebugString() string

func (*GetField) Eval 

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

Eval implements the Expression interface.

func (*GetField) Index 

func (p *GetField) Index() int

Index returns the index where the GetField will look for the value from a sql.Row.

func (*GetField) IsNullable 

func (p *GetField) IsNullable() bool

IsNullable returns whether the field is nullable or not.

func (*GetField) Name 

func (p *GetField) Name() string

Name implements the Nameable interface.

func (*GetField) Resolved 

func (p *GetField) Resolved() bool

Resolved implements the Expression interface.

func (*GetField) String 

func (p *GetField) String() string

func (*GetField) Table 

func (p *GetField) Table() string

Table returns the name of the field table.

func (*GetField) Type 

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

Type returns the type of the field.

func (*GetField) WithChildren 

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

WithChildren implements the Expression interface.

func (*GetField) WithIndex 

func (p *GetField) WithIndex(n int) sql.Expression

WithIndex returns this same GetField with a new index.

func (*GetField) WithName 

func (p *GetField) WithName(name string) *GetField

WithName returns a copy of this expression with the field name given.

func (*GetField) WithTable 

func (p *GetField) WithTable(table string) *GetField

WithTable returns a copy of this expression with the table given

type GreaterThan 

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

GreaterThan is a comparison that checks an expression is greater than another.

func NewGreaterThan 

func NewGreaterThan(left sql.Expression, right sql.Expression) *GreaterThan

NewGreaterThan creates a new GreaterThan expression.

func (*GreaterThan) Compare 

func (c *GreaterThan) Compare(ctx *sql.Context, row sql.Row) (int, error)

Compare the two given values using the types of the expressions in the comparison. Since both types should be equal, it does not matter which type is used, but for reference, the left type is always used.

func (*GreaterThan) DebugString 

func (gt *GreaterThan) DebugString() string

func (*GreaterThan) Eval 

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

Eval implements the Expression interface.

func (*GreaterThan) Left 

func (c *GreaterThan) Left() sql.Expression

Left implements Comparer interface

func (*GreaterThan) Right 

func (c *GreaterThan) Right() sql.Expression

Right implements Comparer interface

func (*GreaterThan) String 

func (gt *GreaterThan) String() string

func (*GreaterThan) Type 

func (*GreaterThan) Type() sql.Type

Type implements the Expression interface.

func (*GreaterThan) WithChildren 

func (gt *GreaterThan) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type GreaterThanOrEqual 

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

GreaterThanOrEqual is a comparison that checks an expression is greater or equal to another.

func NewGreaterThanOrEqual 

func NewGreaterThanOrEqual(left sql.Expression, right sql.Expression) *GreaterThanOrEqual

NewGreaterThanOrEqual creates a new GreaterThanOrEqual

func (*GreaterThanOrEqual) Compare 

func (c *GreaterThanOrEqual) Compare(ctx *sql.Context, row sql.Row) (int, error)

Compare the two given values using the types of the expressions in the comparison. Since both types should be equal, it does not matter which type is used, but for reference, the left type is always used.

func (*GreaterThanOrEqual) DebugString 

func (gte *GreaterThanOrEqual) DebugString() string

func (*GreaterThanOrEqual) Eval 

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

Eval implements the Expression interface.

func (*GreaterThanOrEqual) Left 

func (c *GreaterThanOrEqual) Left() sql.Expression

Left implements Comparer interface

func (*GreaterThanOrEqual) Right 

func (c *GreaterThanOrEqual) Right() sql.Expression

Right implements Comparer interface

func (*GreaterThanOrEqual) String 

func (gte *GreaterThanOrEqual) String() string

func (*GreaterThanOrEqual) Type 

func (*GreaterThanOrEqual) Type() sql.Type

Type implements the Expression interface.

func (*GreaterThanOrEqual) WithChildren 

func (gte *GreaterThanOrEqual) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type InTuple 

type InTuple struct {
	BinaryExpression
}

InTuple is an expression that checks an expression is inside a list of expressions.

func NewInTuple 

func NewInTuple(left sql.Expression, right sql.Expression) *InTuple

NewInTuple creates an InTuple expression.

func (*InTuple) Children 

func (in *InTuple) Children() []sql.Expression

Children implements the Expression interface.

func (*InTuple) Compare 

func (in *InTuple) Compare(ctx *sql.Context, row sql.Row) (int, error)

func (*InTuple) DebugString 

func (in *InTuple) DebugString() string

func (*InTuple) Eval 

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

Eval implements the Expression interface.

func (*InTuple) Left 

func (in *InTuple) Left() sql.Expression

func (*InTuple) Right 

func (in *InTuple) Right() sql.Expression

func (*InTuple) String 

func (in *InTuple) String() string

func (*InTuple) Type 

func (in *InTuple) Type() sql.Type

func (*InTuple) WithChildren 

func (in *InTuple) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Interval 

type Interval struct {
	UnaryExpression
	Unit string
}

Interval defines a time duration.

func NewInterval 

func NewInterval(child sql.Expression, unit string) *Interval

NewInterval creates a new interval expression.

func (*Interval) Eval 

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

Eval implements the sql.Expression interface.

func (*Interval) EvalDelta 

func (i *Interval) EvalDelta(ctx *sql.Context, row sql.Row) (*TimeDelta, error)

EvalDelta evaluates the expression returning a TimeDelta. This method should be used instead of Eval, as this expression returns a TimeDelta, which is not a valid value that can be returned in Eval.

func (*Interval) IsNullable 

func (i *Interval) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*Interval) String 

func (i *Interval) String() string

func (*Interval) Type 

func (i *Interval) Type() sql.Type

Type implements the sql.Expression interface.

func (*Interval) WithChildren 

func (i *Interval) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type IsNull 

type IsNull struct {
	UnaryExpression
}

IsNull is an expression that checks if an expression is null.

func NewIsNull 

func NewIsNull(child sql.Expression) *IsNull

NewIsNull creates a new IsNull expression.

func (IsNull) DebugString 

func (e IsNull) DebugString() string

func (*IsNull) Eval 

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

Eval implements the Expression interface.

func (*IsNull) IsNullable 

func (e *IsNull) IsNullable() bool

IsNullable implements the Expression interface.

func (IsNull) String 

func (e IsNull) String() string

func (*IsNull) Type 

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

Type implements the Expression interface.

func (*IsNull) WithChildren 

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

WithChildren implements the Expression interface.

type IsTrue 

type IsTrue struct {
	UnaryExpression
	// contains filtered or unexported fields
}

IsTrue is an expression that checks if an expression is true.

func NewIsFalse 

func NewIsFalse(child sql.Expression) *IsTrue

NewIsFalse creates a new IsTrue expression with its boolean sense inverted (IsFalse, effectively).

func NewIsTrue 

func NewIsTrue(child sql.Expression) *IsTrue

NewIsTrue creates a new IsTrue expression.

func (*IsTrue) Eval 

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

Eval implements the Expression interface.

func (*IsTrue) IsNullable 

func (*IsTrue) IsNullable() bool

IsNullable implements the Expression interface.

func (*IsTrue) String 

func (e *IsTrue) String() string

func (*IsTrue) Type 

func (*IsTrue) Type() sql.Type

Type implements the Expression interface.

func (*IsTrue) WithChildren 

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

WithChildren implements the Expression interface.

type LessThan 

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

LessThan is a comparison that checks an expression is less than another.

func NewLessThan 

func NewLessThan(left sql.Expression, right sql.Expression) *LessThan

NewLessThan creates a new LessThan expression.

func (*LessThan) Compare 

func (c *LessThan) Compare(ctx *sql.Context, row sql.Row) (int, error)

Compare the two given values using the types of the expressions in the comparison. Since both types should be equal, it does not matter which type is used, but for reference, the left type is always used.

func (*LessThan) DebugString 

func (lt *LessThan) DebugString() string

func (*LessThan) Eval 

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

Eval implements the expression interface.

func (*LessThan) Left 

func (c *LessThan) Left() sql.Expression

Left implements Comparer interface

func (*LessThan) Right 

func (c *LessThan) Right() sql.Expression

Right implements Comparer interface

func (*LessThan) String 

func (lt *LessThan) String() string

func (*LessThan) Type 

func (*LessThan) Type() sql.Type

Type implements the Expression interface.

func (*LessThan) WithChildren 

func (lt *LessThan) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type LessThanOrEqual 

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

LessThanOrEqual is a comparison that checks an expression is equal or lower than another.

func NewLessThanOrEqual 

func NewLessThanOrEqual(left sql.Expression, right sql.Expression) *LessThanOrEqual

NewLessThanOrEqual creates a LessThanOrEqual expression.

func (*LessThanOrEqual) Compare 

func (c *LessThanOrEqual) Compare(ctx *sql.Context, row sql.Row) (int, error)

Compare the two given values using the types of the expressions in the comparison. Since both types should be equal, it does not matter which type is used, but for reference, the left type is always used.

func (*LessThanOrEqual) DebugString 

func (lte *LessThanOrEqual) DebugString() string

func (*LessThanOrEqual) Eval 

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

Eval implements the Expression interface.

func (*LessThanOrEqual) Left 

func (c *LessThanOrEqual) Left() sql.Expression

Left implements Comparer interface

func (*LessThanOrEqual) Right 

func (c *LessThanOrEqual) Right() sql.Expression

Right implements Comparer interface

func (*LessThanOrEqual) String 

func (lte *LessThanOrEqual) String() string

func (*LessThanOrEqual) Type 

func (*LessThanOrEqual) Type() sql.Type

Type implements the Expression interface.

func (*LessThanOrEqual) WithChildren 

func (lte *LessThanOrEqual) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Like 

type Like struct {
	BinaryExpression
	// contains filtered or unexported fields
}

Like performs pattern matching against two strings.

func (*Like) Eval 

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

Eval implements the sql.Expression interface.

func (*Like) String 

func (l *Like) String() string

func (*Like) Type 

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

Type implements the sql.Expression interface.

func (*Like) WithChildren 

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

WithChildren implements the Expression interface.

type Literal 

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

Literal represents a literal expression (string, number, bool, ...).

func NewLiteral 

func NewLiteral(value interface{}, fieldType sql.Type) *Literal

NewLiteral creates a new Literal expression.

func (*Literal) Children 

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

Children implements the Expression interface.

func (*Literal) DebugString 

func (p *Literal) DebugString() string

func (*Literal) Eval 

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

Eval implements the Expression interface.

func (*Literal) IsNullable 

func (p *Literal) IsNullable() bool

IsNullable implements the Expression interface.

func (*Literal) Resolved 

func (p *Literal) Resolved() bool

Resolved implements the Expression interface.

func (*Literal) String 

func (p *Literal) String() string

func (*Literal) Type 

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

Type implements the Expression interface.

func (*Literal) Value 

func (p *Literal) Value() interface{}

Value returns the literal value.

func (*Literal) WithChildren 

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

WithChildren implements the Expression interface.

type NaryExpression 

type NaryExpression struct {
	ChildExpressions []sql.Expression
}

func (*NaryExpression) Children 

func (n *NaryExpression) Children() []sql.Expression

Children implements the Expression interface.

func (*NaryExpression) IsNullable 

func (n *NaryExpression) IsNullable() bool

IsNullable returns whether the expression can be null.

func (*NaryExpression) Resolved 

func (n *NaryExpression) Resolved() bool

Resolved implements the Expression interface.

type Not 

type Not struct {
	UnaryExpression
}

Not is a node that negates an expression.

func NewNot 

func NewNot(child sql.Expression) *Not

NewNot returns a new Not node.

func (*Not) DebugString 

func (e *Not) DebugString() string

func (*Not) Eval 

func (e *Not) Eval(ctx *sql.Context, row sql.Row) (interface{}, error)

Eval implements the Expression interface.

func (*Not) String 

func (e *Not) String() string

func (*Not) Type 

func (e *Not) Type() sql.Type

Type implements the Expression interface.

func (*Not) WithChildren 

func (e *Not) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type NullSafeEquals 

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

NullSafeEquals is a comparison that checks an expression is equal to another, where NULLs do not coalesce to NULL and two NULLs compare equal to each other.

func NewNullSafeEquals 

func NewNullSafeEquals(left sql.Expression, right sql.Expression) *NullSafeEquals

NewNullSafeEquals returns a new NullSafeEquals expression.

func (*NullSafeEquals) Compare 

func (e *NullSafeEquals) Compare(ctx *sql.Context, row sql.Row) (int, error)

func (*NullSafeEquals) DebugString 

func (e *NullSafeEquals) DebugString() string

func (*NullSafeEquals) Eval 

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

Eval implements the Expression interface.

func (*NullSafeEquals) Left 

func (c *NullSafeEquals) Left() sql.Expression

Left implements Comparer interface

func (*NullSafeEquals) Right 

func (c *NullSafeEquals) Right() sql.Expression

Right implements Comparer interface

func (*NullSafeEquals) String 

func (e *NullSafeEquals) String() string

func (*NullSafeEquals) Type 

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

Type implements the Expression interface.

func (*NullSafeEquals) WithChildren 

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

WithChildren implements the Expression interface.

type Or 

type Or struct {
	BinaryExpression
}

Or checks whether one of the two given expressions is true.

func (*Or) DebugString 

func (o *Or) DebugString() string

func (*Or) Eval 

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

Eval implements the Expression interface.

func (*Or) String 

func (o *Or) String() string

func (*Or) Type 

func (*Or) Type() sql.Type

Type implements the Expression interface.

func (*Or) WithChildren 

func (o *Or) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type ProcedureParam 

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

ProcedureParam represents the parameter of a stored procedure or stored function.

func NewProcedureParam 

func NewProcedureParam(name string) *ProcedureParam

NewProcedureParam creates a new ProcedureParam expression.

func (*ProcedureParam) Children 

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

Children implements the sql.Expression interface.

func (*ProcedureParam) Eval 

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

Eval implements the sql.Expression interface.

func (*ProcedureParam) IsNullable 

func (*ProcedureParam) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*ProcedureParam) Name 

func (pp *ProcedureParam) Name() string

Name implements the Nameable interface.

func (*ProcedureParam) Resolved 

func (*ProcedureParam) Resolved() bool

Resolved implements the sql.Expression interface.

func (*ProcedureParam) Set 

func (pp *ProcedureParam) Set(val interface{}, valType sql.Type) error

Set sets the value of this procedure parameter to the given value.

func (*ProcedureParam) String 

func (pp *ProcedureParam) String() string

String implements the sql.Expression interface.

func (*ProcedureParam) Type 

func (pp *ProcedureParam) Type() sql.Type

Type implements the sql.Expression interface.

func (*ProcedureParam) WithChildren 

func (pp *ProcedureParam) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the sql.Expression interface.

func (*ProcedureParam) WithParamReference 

func (pp *ProcedureParam) WithParamReference(pRef *ProcedureParamReference) *ProcedureParam

WithParamReference returns a new *ProcedureParam containing the given *ProcedureParamReference.

type ProcedureParamReference 

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

ProcedureParamReference contains the references to the parameters for a single CALL statement.

func NewProcedureParamReference 

func NewProcedureParamReference() *ProcedureParamReference

func (*ProcedureParamReference) Get 

func (ppr *ProcedureParamReference) Get(name string) (interface{}, error)

Get returns the value of the given parameter. Name is case-insensitive.

func (*ProcedureParamReference) GetType 

func (ppr *ProcedureParamReference) GetType(name string) sql.Type

GetType returns the type of the given parameter. Name is case-insensitive. Returns the NULL type if the type cannot be found.

func (*ProcedureParamReference) HasBeenSet 

func (ppr *ProcedureParamReference) HasBeenSet(name string) bool

HasBeenSet returns whether the parameter has had its value altered from the initial value.

func (*ProcedureParamReference) Initialize 

func (ppr *ProcedureParamReference) Initialize(name string, sqlType sql.Type, val interface{}) error

Initialize sets the initial value for the parameter.

func (*ProcedureParamReference) Set 

func (ppr *ProcedureParamReference) Set(name string, val interface{}, valType sql.Type) error

Set updates the value of the given parameter. Name is case-insensitive.

type Regexp 

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

Regexp is a comparison that checks an expression matches a regexp.

func NewRegexp 

func NewRegexp(left sql.Expression, right sql.Expression) *Regexp

NewRegexp creates a new Regexp expression.

func (*Regexp) Compare 

func (c *Regexp) Compare(ctx *sql.Context, row sql.Row) (int, error)

Compare the two given values using the types of the expressions in the comparison. Since both types should be equal, it does not matter which type is used, but for reference, the left type is always used.

func (*Regexp) DebugString 

func (re *Regexp) DebugString() string

func (*Regexp) Eval 

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

Eval implements the Expression interface.

func (*Regexp) Left 

func (c *Regexp) Left() sql.Expression

Left implements Comparer interface

func (*Regexp) Right 

func (c *Regexp) Right() sql.Expression

Right implements Comparer interface

func (*Regexp) String 

func (re *Regexp) String() string

func (*Regexp) Type 

func (*Regexp) Type() sql.Type

Type implements the Expression interface.

func (*Regexp) WithChildren 

func (re *Regexp) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type SetField 

type SetField struct {
	BinaryExpression
}

SetField updates the value of a field or a system variable

func (*SetField) DebugString 

func (s *SetField) DebugString() string

func (*SetField) Eval 

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

Eval implements the Expression interface. Returns a copy of the given row with an updated value.

func (*SetField) String 

func (s *SetField) String() string

func (*SetField) Type 

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

Type implements the Expression interface.

func (*SetField) WithChildren 

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

WithChildren implements the Expression interface.

type Sorter 

type Sorter struct {
	SortFields []sql.SortField
	Rows       []sql.Row
	LastError  error
	Ctx        *sql.Context
}

func (*Sorter) Len 

func (s *Sorter) Len() int

func (*Sorter) Less 

func (s *Sorter) Less(i, j int) bool

func (*Sorter) Swap 

func (s *Sorter) Swap(i, j int)

type Star 

type Star struct {
	Table string
}

Star represents the selection of all available fields. This is just a placeholder node, it will not actually be evaluated but converted to a series of GetFields when the query is analyzed.

func NewQualifiedStar 

func NewQualifiedStar(table string) *Star

NewQualifiedStar returns a new star expression only for a specific table.

func NewStar 

func NewStar() *Star

NewStar returns a new Star expression.

func (*Star) Children 

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

Children implements the Expression interface.

func (*Star) Eval 

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

Eval implements the Expression interface.

func (*Star) IsNullable 

func (*Star) IsNullable() bool

IsNullable implements the Expression interface.

func (*Star) Resolved 

func (*Star) Resolved() bool

Resolved implements the Expression interface.

func (*Star) String 

func (s *Star) String() string

func (*Star) Type 

func (*Star) Type() sql.Type

Type implements the Expression interface.

func (*Star) WithChildren 

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

WithChildren implements the Expression interface.

type SystemVar 

type SystemVar struct {
	Name  string
	Scope sql.SystemVariableScope
}

SystemVar is an expression that returns the value of a system variable. It's also used as the expression on the left hand side of a SET statement for a system variable.

func NewSystemVar 

func NewSystemVar(name string, scope sql.SystemVariableScope) *SystemVar

NewSystemVar creates a new SystemVar expression.

func (*SystemVar) Children 

func (v *SystemVar) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*SystemVar) Eval 

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

Eval implements the sql.Expression interface.

func (*SystemVar) IsNullable 

func (v *SystemVar) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*SystemVar) Resolved 

func (v *SystemVar) Resolved() bool

Resolved implements the sql.Expression interface.

func (*SystemVar) String 

func (v *SystemVar) String() string

String implements the sql.Expression interface.

func (*SystemVar) Type 

func (v *SystemVar) Type() sql.Type

Type implements the sql.Expression interface.

func (*SystemVar) WithChildren 

func (v *SystemVar) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type TimeDelta 

type TimeDelta struct {
	Years        int64
	Months       int64
	Days         int64
	Hours        int64
	Minutes      int64
	Seconds      int64
	Microseconds int64
}

TimeDelta is the difference between a time and another time.

func (TimeDelta) Add 

func (td TimeDelta) Add(t time.Time) time.Time

Add returns the given time plus the time delta.

func (TimeDelta) Sub 

func (td TimeDelta) Sub(t time.Time) time.Time

Sub returns the given time minus the time delta.

type TransformExprWithNodeFunc 

type TransformExprWithNodeFunc func(sql.Node, sql.Expression) (sql.Expression, error)

TransformExprWithNodeFunc is a function that given an expression and the node that contains it, will return that expression as is or transformed along with an error, if any.

type Tuple 

type Tuple []sql.Expression

Tuple is a fixed-size collection of expressions. A tuple of size 1 is treated as the expression itself.

func NewTuple 

func NewTuple(exprs ...sql.Expression) Tuple

NewTuple creates a new Tuple expression.

func (Tuple) Children 

func (t Tuple) Children() []sql.Expression

Children implements the Expression interface.

func (Tuple) DebugString 

func (t Tuple) DebugString() string

func (Tuple) Eval 

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

Eval implements the Expression interface.

func (Tuple) IsNullable 

func (t Tuple) IsNullable() bool

IsNullable implements the Expression interface.

func (Tuple) Resolved 

func (t Tuple) Resolved() bool

Resolved implements the Expression interface.

func (Tuple) String 

func (t Tuple) String() string

func (Tuple) Type 

func (t Tuple) Type() sql.Type

Type implements the Expression interface.

func (Tuple) WithChildren 

func (t Tuple) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type UnaryExpression 

type UnaryExpression struct {
	Child sql.Expression
}

UnaryExpression is an expression that has only one children.

func (*UnaryExpression) Children 

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

Children implements the Expression interface.

func (*UnaryExpression) IsNullable 

func (p *UnaryExpression) IsNullable() bool

IsNullable returns whether the expression can be null.

func (*UnaryExpression) Resolved 

func (p *UnaryExpression) Resolved() bool

Resolved implements the Expression interface.

type UnaryMinus 

type UnaryMinus struct {
	UnaryExpression
}

UnaryMinus is an unary minus operator.

func NewUnaryMinus 

func NewUnaryMinus(child sql.Expression) *UnaryMinus

NewUnaryMinus creates a new UnaryMinus expression node.

func (*UnaryMinus) Eval 

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

Eval implements the sql.Expression interface.

func (*UnaryMinus) String 

func (e *UnaryMinus) String() string

func (*UnaryMinus) Type 

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

Type implements the sql.Expression interface.

func (*UnaryMinus) WithChildren 

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

WithChildren implements the Expression interface.

type UnresolvedColumn 

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

UnresolvedColumn is an expression of a column that is not yet resolved. This is a placeholder node, so its methods Type, IsNullable and Eval are not supposed to be called.

func NewUnresolvedColumn 

func NewUnresolvedColumn(name string) *UnresolvedColumn

NewUnresolvedColumn creates a new UnresolvedColumn expression.

func NewUnresolvedQualifiedColumn 

func NewUnresolvedQualifiedColumn(table, name string) *UnresolvedColumn

NewUnresolvedQualifiedColumn creates a new UnresolvedColumn expression with a table qualifier.

func (*UnresolvedColumn) Children 

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

Children implements the Expression interface.

func (*UnresolvedColumn) Eval 

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

Eval implements the Expression interface.

func (*UnresolvedColumn) IsNullable 

func (*UnresolvedColumn) IsNullable() bool

IsNullable implements the Expression interface.

func (*UnresolvedColumn) Name 

func (uc *UnresolvedColumn) Name() string

Name implements the Nameable interface.

func (*UnresolvedColumn) Resolved 

func (*UnresolvedColumn) Resolved() bool

Resolved implements the Expression interface.

func (*UnresolvedColumn) String 

func (uc *UnresolvedColumn) String() string

func (*UnresolvedColumn) Table 

func (uc *UnresolvedColumn) Table() string

Table returns the table name.

func (*UnresolvedColumn) Type 

func (*UnresolvedColumn) Type() sql.Type

Type implements the Expression interface.

func (*UnresolvedColumn) WithChildren 

func (uc *UnresolvedColumn) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type UnresolvedFunction 

type UnresolvedFunction struct {

	// IsAggregate or not.
	IsAggregate bool
	// Window is the window for this function, if present
	Window *sql.Window
	// Children of the expression.
	Arguments []sql.Expression
	// contains filtered or unexported fields
}

UnresolvedFunction represents a function that is not yet resolved. This is a placeholder node, so its methods Type, IsNullable and Eval are not supposed to be called.

func NewUnresolvedFunction 

func NewUnresolvedFunction(
	name string,
	agg bool,
	window *sql.Window,
	arguments ...sql.Expression,
) *UnresolvedFunction

NewUnresolvedFunction creates a new UnresolvedFunction expression.

func (*UnresolvedFunction) Children 

func (uf *UnresolvedFunction) Children() []sql.Expression

Children implements the Expression interface.

func (*UnresolvedFunction) DebugString 

func (uf *UnresolvedFunction) DebugString() string

func (*UnresolvedFunction) Eval 

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

Eval implements the Expression interface.

func (*UnresolvedFunction) IsNullable 

func (*UnresolvedFunction) IsNullable() bool

IsNullable implements the Expression interface.

func (*UnresolvedFunction) Name 

func (uf *UnresolvedFunction) Name() string

Name implements the Nameable interface.

func (*UnresolvedFunction) Resolved 

func (*UnresolvedFunction) Resolved() bool

Resolved implements the Expression interface.

func (*UnresolvedFunction) String 

func (uf *UnresolvedFunction) String() string

func (*UnresolvedFunction) Type 

func (*UnresolvedFunction) Type() sql.Type

Type implements the Expression interface.

func (*UnresolvedFunction) WithChildren 

func (uf *UnresolvedFunction) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type UserVar 

type UserVar struct {
	Name string
}

UserVar is an expression that returns the value of a user variable. It's also used as the expression on the left hand side of a SET statement for a user var.

func NewUserVar 

func NewUserVar(name string) *UserVar

NewUserVar creates a new UserVar expression.

func (*UserVar) Children 

func (v *UserVar) Children() []sql.Expression

Children implements the sql.Expression interface.

func (*UserVar) Eval 

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

Eval implements the sql.Expression interface.

func (*UserVar) IsNullable 

func (v *UserVar) IsNullable() bool

IsNullable implements the sql.Expression interface.

func (*UserVar) Resolved 

func (v *UserVar) Resolved() bool

Resolved implements the sql.Expression interface.

func (*UserVar) String 

func (v *UserVar) String() string

String implements the sql.Expression interface.

func (*UserVar) Type 

func (v *UserVar) Type() sql.Type

Type implements the sql.Expression interface. TODO: type checking based on type of user var

func (*UserVar) WithChildren 

func (v *UserVar) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements the Expression interface.

type Wrapper 

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

Wrapper simply acts as a wrapper for another expression. If a nil expression is wrapped, then the wrapper functions as a guard against functions that expect non-nil expressions.

func WrapExpression 

func WrapExpression(expr sql.Expression) *Wrapper

WrapExpression takes in an expression and wraps it, returning the resulting Wrapper expression. Useful for when an expression is nil.

func (*Wrapper) Children 

func (w *Wrapper) Children() []sql.Expression

Children implements sql.Expression

func (*Wrapper) Eval 

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

Eval implements sql.Expression

func (*Wrapper) IsNullable 

func (w *Wrapper) IsNullable() bool

IsNullable implements sql.Expression

func (*Wrapper) Resolved 

func (w *Wrapper) Resolved() bool

Resolved implements sql.Expression

func (*Wrapper) String 

func (w *Wrapper) String() string

String implements sql.Expression

func (*Wrapper) Type 

func (w *Wrapper) Type() sql.Type

Type implements sql.Expression

func (*Wrapper) Unwrap 

func (w *Wrapper) Unwrap() sql.Expression

Unwrap returns the wrapped expression, or nil if no expression was wrapped.

func (*Wrapper) WithChildren 

func (w *Wrapper) WithChildren(children ...sql.Expression) (sql.Expression, error)

WithChildren implements sql.Expression

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