Documentation
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Index ¶
- Variables
- func Fields(expr Expression) []shared.Field
- func IsArithmetic(expr Expression) (_ ArithmeticType, left, right Expression)
- func IsComparison(expr Expression) (_ ComparisonType, left, right Expression)
- func SubsumesOrder(a, b OrderExpression) bool
- type AggregateExpression
- type ArithmeticType
- type ComparisonType
- type CompositeExpression
- type Expression
- func Conjunctions(e Expression) []Expression
- func Disjunctions(e Expression) []Expression
- func FilterDifference(filter, childFilter Expression) Expression
- func FilterIntersection(filter, childFilter Expression) Expression
- func NewAddition(left, right Expression) Expression
- func NewAnd(left, right Expression) Expression
- func NewBetween(left, middle, right Expression) Expression
- func NewBetweenSymmetric(left, middle, right Expression) Expression
- func NewConcat(left, right Expression) Expression
- func NewConstant(value any) Expression
- func NewDivision(left, right Expression) Expression
- func NewEquals(left, right Expression) Expression
- func NewFunction(name string, args []Expression) Expression
- func NewGreaterThan(left, right Expression) Expression
- func NewGreaterThanEquals(left, right Expression) Expression
- func NewILike(left, right Expression) Expression
- func NewIsDistinctFrom(left, right Expression) Expression
- func NewIsFalse(expression Expression) Expression
- func NewIsNull(expression Expression) Expression
- func NewIsTrue(expression Expression) Expression
- func NewIsUnknown(expression Expression) Expression
- func NewLessThan(left, right Expression) Expression
- func NewLessThanEquals(left, right Expression) Expression
- func NewLike(left, right Expression) Expression
- func NewMultiplication(left, right Expression) Expression
- func NewNamed(field shared.Field) Expression
- func NewNot(expression Expression) Expression
- func NewOr(left, right Expression) Expression
- func NewSubtraction(left, right Expression) Expression
- func NewUnaryMinus(expression Expression) Expression
- func NewUnaryPlus(expression Expression) Expression
- func UnionFilters(filters ...Expression) Expression
- type ExpressionContext
- type ExpressionWithDirection
- type NamedExpression
- type OrderExpression
Constants ¶
This section is empty.
Variables ¶
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var EmptyContext = noopContext{}
Functions ¶
func Fields ¶
func Fields(expr Expression) []shared.Field
func IsArithmetic ¶
func IsArithmetic(expr Expression) (_ ArithmeticType, left, right Expression)
func IsComparison ¶
func IsComparison(expr Expression) (_ ComparisonType, left, right Expression)
func SubsumesOrder ¶
func SubsumesOrder(a, b OrderExpression) bool
Types ¶
type AggregateExpression ¶
type AggregateExpression interface {
Step(ctx ExpressionContext, row shared.Row) error
Done(ctx ExpressionContext) (any, error)
}
func AsAggregate ¶
func AsAggregate(ctx ExpressionContext, e Expression) AggregateExpression
type ArithmeticType ¶
type ArithmeticType int
const ( ArithmeticTypeUnknown ArithmeticType = iota ArithmeticTypeAddition ArithmeticTypeSubtraction ArithmeticTypeMultiplication ArithmeticTypeDivision )
func ArithmeticTypeFromString ¶
func ArithmeticTypeFromString(operator string) ArithmeticType
func (ArithmeticType) IsSymmetric ¶
func (at ArithmeticType) IsSymmetric() bool
func (ArithmeticType) String ¶
func (at ArithmeticType) String() string
type ComparisonType ¶
type ComparisonType int
const ( ComparisonTypeUnknown ComparisonType = iota ComparisonTypeEquals ComparisonTypeDistinctFrom ComparisonTypeLessThanEquals ComparisonTypeLessThan ComparisonTypeGreaterThanEquals ComparisonTypeGreaterThan )
func ComparisonTypeFromString ¶
func ComparisonTypeFromString(operator string) ComparisonType
func (ComparisonType) Flip ¶
func (ct ComparisonType) Flip() ComparisonType
func (ComparisonType) MatchesOrderType ¶
func (ct ComparisonType) MatchesOrderType(lVal, rVal any) (bool, error)
func (ComparisonType) String ¶
func (ct ComparisonType) String() string
type CompositeExpression ¶
type CompositeExpression interface {
Children() []Expression
}
type Expression ¶
type Expression interface {
fmt.Stringer
Equal(other Expression) bool
Fold() Expression
Map(f func(Expression) Expression) Expression
ValueFrom(context ExpressionContext, row shared.Row) (any, error)
}
func Conjunctions ¶
func Conjunctions(e Expression) []Expression
func Disjunctions ¶
func Disjunctions(e Expression) []Expression
func FilterDifference ¶
func FilterDifference(filter, childFilter Expression) Expression
func FilterIntersection ¶
func FilterIntersection(filter, childFilter Expression) Expression
func NewAddition ¶
func NewAddition(left, right Expression) Expression
func NewAnd ¶
func NewAnd(left, right Expression) Expression
func NewBetween ¶
func NewBetween(left, middle, right Expression) Expression
func NewBetweenSymmetric ¶
func NewBetweenSymmetric(left, middle, right Expression) Expression
func NewConcat ¶
func NewConcat(left, right Expression) Expression
func NewConstant ¶
func NewConstant(value any) Expression
func NewDivision ¶
func NewDivision(left, right Expression) Expression
func NewEquals ¶
func NewEquals(left, right Expression) Expression
func NewFunction ¶
func NewFunction(name string, args []Expression) Expression
func NewGreaterThan ¶
func NewGreaterThan(left, right Expression) Expression
func NewGreaterThanEquals ¶
func NewGreaterThanEquals(left, right Expression) Expression
func NewILike ¶
func NewILike(left, right Expression) Expression
func NewIsDistinctFrom ¶
func NewIsDistinctFrom(left, right Expression) Expression
func NewIsFalse ¶
func NewIsFalse(expression Expression) Expression
func NewIsNull ¶
func NewIsNull(expression Expression) Expression
func NewIsTrue ¶
func NewIsTrue(expression Expression) Expression
func NewIsUnknown ¶
func NewIsUnknown(expression Expression) Expression
func NewLessThan ¶
func NewLessThan(left, right Expression) Expression
func NewLessThanEquals ¶
func NewLessThanEquals(left, right Expression) Expression
func NewLike ¶
func NewLike(left, right Expression) Expression
func NewMultiplication ¶
func NewMultiplication(left, right Expression) Expression
func NewNamed ¶
func NewNamed(field shared.Field) Expression
func NewNot ¶
func NewNot(expression Expression) Expression
func NewOr ¶
func NewOr(left, right Expression) Expression
func NewSubtraction ¶
func NewSubtraction(left, right Expression) Expression
func NewUnaryMinus ¶
func NewUnaryMinus(expression Expression) Expression
func NewUnaryPlus ¶
func NewUnaryPlus(expression Expression) Expression
func UnionFilters ¶
func UnionFilters(filters ...Expression) Expression
type ExpressionContext ¶
type ExpressionWithDirection ¶
type ExpressionWithDirection struct {
Expression Expression
Reverse bool
}
func (ExpressionWithDirection) Fold ¶
func (e ExpressionWithDirection) Fold() ExpressionWithDirection
type NamedExpression ¶
type OrderExpression ¶
type OrderExpression interface {
Expressions() []ExpressionWithDirection
Fold() OrderExpression
Map(f func(e Expression) Expression) OrderExpression
}
func NewOrderExpression ¶
func NewOrderExpression(expressions []ExpressionWithDirection) OrderExpression
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