Function value_to_decimal

nodedb-query/src/expr/binary.rs:22–29

Coerce a `Value` to `Decimal` for precise arithmetic. - `Decimal`: identity - `Integer`: exact conversion via `Decimal::from` - `Float`: best-effort via `Decimal::try_from` (preserves fractional digits rather than compounding f64 ULP error through further f64 arithmetic) - Other types: `None`

(v: &Value)

///   rather than compounding f64 ULP error through further f64 arithmetic)
/// - Other types: `None`
fn value_to_decimal(v: &Value) -> Option<Decimal> {
    match v {
        Value::Decimal(d) => Some(*d),
        Value::Integer(i) => Some(Decimal::from(*i)),
        Value::Float(f) => Decimal::try_from(*f).ok(),
        _ => None,
    }
}

/// Apply a Decimal arithmetic operation, returning `Value::Null` on overflow/div-zero.
fn decimal_arith(a: Decimal, op: BinaryOp, b: Decimal) -> Value {