Enum Expression 

pub enum Expression {
    Integer(i64),
    Float(f64),
    String(String),
    Boolean(bool),
    Null,
    Variable(String),
    Property {
        object: Box<Expression>,
        property: String,
    },
    List(Vec<Expression>),
    Map(HashMap<String, Expression>),
    BinaryOp {
        left: Box<Expression>,
        op: BinaryOperator,
        right: Box<Expression>,
    },
    UnaryOp {
        op: UnaryOperator,
        operand: Box<Expression>,
    },
    FunctionCall {
        name: String,
        args: Vec<Expression>,
    },
    Aggregation {
        function: AggregationFunction,
        expression: Box<Expression>,
        distinct: bool,
    },
    PatternPredicate(Box<Pattern>),
    Case {
        expression: Option<Box<Expression>>,
        alternatives: Vec<(Expression, Expression)>,
        default: Option<Box<Expression>>,
    },
}

Expression tree

Variants

Integer(i64)

Float(f64)

String(String)

Boolean(bool)

Null

Variable(String)

Property

Fields

object: Box<Expression>

property: String

List(Vec<Expression>)

Map(HashMap<String, Expression>)

BinaryOp

Fields

left: Box<Expression>

op: BinaryOperator

right: Box<Expression>

UnaryOp

Fields

op: UnaryOperator

operand: Box<Expression>

FunctionCall

Fields

name: String

args: Vec<Expression>

Aggregation

Fields

function: AggregationFunction

expression: Box<Expression>

distinct: bool

PatternPredicate(Box<Pattern>)

Case

Fields

expression: Option<Box<Expression>>

alternatives: Vec<(Expression, Expression)>

default: Option<Box<Expression>>

Implementations

impl Expression

pub fn is_constant(&self) -> bool

Check if expression is constant (no variables)

pub fn has_aggregation(&self) -> bool

Check if expression contains aggregation

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<'de> Deserialize<'de> for Expression

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

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 Serialize for Expression

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Expression