Enum Expression 

pub enum Expression {
    Literal(Literal),
    Variable(String),
    Property(Box<Expression>, String),
    Parameter(String),
    BinaryOp(BinaryOp, Box<Expression>, Box<Expression>),
    UnaryOp(UnaryOp, Box<Expression>),
    FunctionCall {
        name: String,
        distinct: bool,
        args: Vec<Expression>,
    },
    IsNull(Box<Expression>, bool),
    CountStar,
    ListLiteral(Vec<Expression>),
    TemporalRef {
        node: Box<Expression>,
        timestamp: Box<Expression>,
    },
}

An expression node in the AST.

Variants

Literal(Literal)

A literal value.

Variable(String)

A variable reference.

Property(Box<Expression>, String)

Property access: expr.prop

Parameter(String)

Parameter reference: $name

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

Binary operation: lhs op rhs.

UnaryOp(UnaryOp, Box<Expression>)

Unary operation: op expr.

FunctionCall

Function call: name(args) or name(DISTINCT args).

Fields

name: String

Function name.

distinct: bool

Whether DISTINCT was specified.

args: Vec<Expression>

Function arguments.

IsNull(Box<Expression>, bool)

expr IS [NOT] NULL – bool is true when IS NOT NULL

CountStar

count(*)

ListLiteral(Vec<Expression>)

List literal: [expr, expr, ...]

TemporalRef

Temporal reference: expr AT TIME expr in hyperedge participant lists.

Fields

node: Box<Expression>

The node expression.

timestamp: Box<Expression>

The timestamp 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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Expression