Enum AggResult 

pub enum AggResult {
    Null,
    F64(f64),
    Decimal {
        mantissa: i128,
        scale: u8,
    },
    Histogram(Box<Histogram>),
}

One aggregate’s result, in the type that keeps it exact.

Every column type but decimal reduces to an f64, which is what it already was. A decimal column stays a decimal all the way to the output array: sum, min, max, first and last over exact values are themselves exact, and turning them into a double on the way out would undo the whole point of the column.

Variants

Null

SQL NULL — an empty bucket, or a result that overflowed.

F64(f64)

A floating-point result.

Decimal

An exact decimal result: mantissa × 10⁻ˢᶜᵃˡᵉ.

Fields

mantissa: i128

The unscaled result.

scale: u8

Digits after the decimal point.

Histogram(Box<Histogram>)

A merged native histogram.

The aggregate of a distribution is a distribution, not a number — which is why this is a variant rather than something as_f64 can answer. sum merges, avg merges and scales; min and max are undefined over distributions and are refused rather than guessed.

Implementations

impl AggResult

pub fn as_f64(self) -> Option<f64>

The result as an f64, for the callers that only deal in floats.

Lossy for a decimal, by definition — see extract_f64 for where that is and is not the right thing to do.

Trait Implementations

impl Clone for AggResult

fn clone(&self) -> AggResult

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AggResult

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

Formats the value using the given formatter.

impl PartialEq for AggResult

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for AggResult