Enum Expression 

pub enum Expression {
    Constant(Constant),
    Variable(String),
    Parameter(String),
    PropertyAccess(Box<Expression>, String),
    FunctionCall(String, Vec<Expression>),
    BinaryOp(BinaryOp, Box<Expression>, Box<Expression>),
    UnaryOp(UnaryOp, Box<Expression>),
    List(Vec<Expression>),
    Map(Vec<(String, Expression)>),
    ExistsSubquery(Box<Query>),
    Case(CaseExpr),
    Star,
    ListPredicate {
        quantifier: Quantifier,
        list: Box<Expression>,
        var_name: String,
        predicate: Box<Expression>,
    },
    Lambda {
        var_name: String,
        body: Box<Expression>,
    },
}

An expression in a Cypher query.

Variants

Constant(Constant)

Variable(String)

Parameter(String)

A query parameter reference like $name or $age.

PropertyAccess(Box<Expression>, String)

FunctionCall(String, Vec<Expression>)

BinaryOp(BinaryOp, Box<Expression>, Box<Expression>)

UnaryOp(UnaryOp, Box<Expression>)

List(Vec<Expression>)

Map(Vec<(String, Expression)>)

ExistsSubquery(Box<Query>)

EXISTS { MATCH … WHERE … } — returns true if the pattern matches.

Case(CaseExpr)

CASE [subject] WHEN … THEN … [ELSE …] END

Star

STAR expression — represents * in RETURN *. The binder expands this to all variables in scope.

ListPredicate

ANY/ALL/NONE/SINGLE list predicates. Example: ANY(x IN [1,2,3] WHERE x > 5)

Fields

quantifier: Quantifier

list: Box<Expression>

var_name: String

predicate: Box<Expression>

Lambda

Lambda expression for list_transform, list_filter, list_reduce. Example: x -> x + 1 or (x, y) -> x + y

Fields

var_name: String

body: Box<Expression>

Trait Implementations

impl Clone for Expression

fn clone(&self) -> Expression

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Expression

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Expression

fn eq(&self, other: &Expression) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Expression