Enum ScalarExpr 

pub enum ScalarExpr<F> {
    Column(F),
    Literal(Literal),
    Binary {
        left: Box<ScalarExpr<F>>,
        op: BinaryOp,
        right: Box<ScalarExpr<F>>,
    },
    Aggregate(AggregateCall<F>),
    GetField {
        base: Box<ScalarExpr<F>>,
        field_name: String,
    },
}

Arithmetic scalar expression that can reference multiple fields.

Variants

Column(F)

Literal(Literal)

Binary

Fields

left: Box<ScalarExpr<F>>

op: BinaryOp

right: Box<ScalarExpr<F>>

Aggregate(AggregateCall<F>)

Aggregate function call (e.g., COUNT(), SUM(col), etc.) This is used in expressions like COUNT() + 1

GetField

Extract a field from a struct expression. For example: user.address.city would be represented as GetField { base: GetField { base: Column(user), field_name: “address” }, field_name: “city” }

Fields

base: Box<ScalarExpr<F>>

field_name: String

Implementations

impl<F> ScalarExpr<F>

pub fn column(field: F) -> Self

pub fn literal<L: Into<Literal>>(lit: L) -> Self

pub fn binary(left: Self, op: BinaryOp, right: Self) -> Self

pub fn aggregate(call: AggregateCall<F>) -> Self

pub fn get_field(base: Self, field_name: String) -> Self

Trait Implementations

impl<F: Clone> Clone for ScalarExpr<F>

fn clone(&self) -> ScalarExpr<F>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<F: Debug> Debug for ScalarExpr<F>

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

Formats the value using the given formatter.