Enum Aggregator 

pub enum Aggregator {
    Count,
    Sum,
    Min,
    Max,
    Avg,
}

SQL/SPARQL aggregator vocabulary supported in rule bodies.

Mirrors the subset called out in the extension deliverable (the rule validation specification): MIN, MAX, SUM, COUNT, AVG. SPARQL’s SAMPLE and GROUP_CONCAT are not in scope for extension — they map onto SPARQL’s Group operator rather than a Datalog rule body.

Variants

Count

COUNT(?expr) — number of distinct ?expr values that appear in the inner result set.

Sum

SUM(?expr) — numeric sum of ?expr values.

Min

MIN(?expr) — minimum ?expr value under SPARQL’s ordering (numeric / lexicographic per term kind).

Max

MAX(?expr) — maximum ?expr value under the same ordering as Self::Min.

Avg

AVG(?expr) — numeric mean of ?expr values. Undefined for an empty input.

Implementations

impl Aggregator

pub fn name(self) -> &'static str

Render the aggregator as its canonical uppercase name. Used by diagnostics and rule-name maps.

Trait Implementations

impl Clone for Aggregator

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Aggregator

impl Debug for Aggregator

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

Formats the value using the given formatter.

impl Eq for Aggregator

impl Hash for Aggregator

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Aggregator

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Aggregator

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Aggregator

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Aggregator