Enum AggArg 

pub enum AggArg {
    Star,
    Var(String),
    Prop {
        var: String,
        field: String,
    },
    Distinct(Box<AggArg>),
}

Argument to an aggregate function.

Variants

Star

COUNT(*) — every matched row counts regardless of binding.

Var(String)

COUNT(var) — counts rows where var is bound (non-null).

Prop

SUM(var.field), AVG(var.field), etc.

Fields

var: String

field: String

Distinct(Box<AggArg>)

COUNT(DISTINCT var) / COLLECT(DISTINCT var.field) — the inner argument is fed to the accumulator at most once per distinct value within a group.

This is what makes an N-way relation intersection expressible: a company reached by three edge types yields three rows per talent, and only count(DISTINCT t) counts the talent once. The parser rejects DISTINCT * and nested DISTINCT, so the inner argument is always Star-free and one level deep.

Trait Implementations

impl Clone for AggArg

fn clone(&self) -> AggArg

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AggArg

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

Formats the value using the given formatter.

impl PartialEq for AggArg

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for AggArg