Enum Expr

pub enum Expr {
    Value(Value),
    ColumnRef(ColumnRef),
    Wildcard,
    Binary {
        left: Box<Expr>,
        op: BinOp,
        right: Box<Expr>,
    },
    Unary {
        op: UnOp,
        operand: Box<Expr>,
    },
    Function {
        name: BoundedString,
        args: Vec<Expr>,
    },
}

An expression

Variants

Value(Value)

ColumnRef(ColumnRef)

Wildcard

Binary

Fields

left: Box<Expr>

op: BinOp

right: Box<Expr>

Unary

Fields

op: UnOp

operand: Box<Expr>

Function

Fields

name: BoundedString

args: Vec<Expr>

Implementations

impl Expr

pub fn execute( expr: &Expr, table: &Table, row: RowShared<'_>, ) -> Result<Value, ExprExecError>

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.

impl Display for Expr

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

Formats the value using the given formatter.

impl PartialEq for Expr

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

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

const 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 TryFrom<Expr> for Expr

type Error = ExprError

The type returned in the event of a conversion error.

fn try_from(expr_ast: Expr) -> Result<Self, Self::Error>

Performs the conversion.

impl StructuralPartialEq for Expr