Enum AggregableKind 

pub enum AggregableKind {
    Orderable,
    Boolean,
    Opaque,
}

What kind of value an aggregate would have to collapse — the axis SqlRenderer::render_single_row_aggregate varies on, held to three arms because three is what the measurements distinguish.

Not the full type lattice: MAX behaves identically across every numeric, textual and temporal type on every platform razeri reaches, and splitting them would invite per-type arms nothing has measured.

Variants

Orderable

Numeric, textual and temporal — every platform orders these and every platform has MAX for them.

Boolean

A truth value. PostgreSQL and SQL Server have no MAX for it and each spells the collapse differently.

Opaque

uuid, JSON, binary, interval, array, map — the families with no ordering to borrow. Availability is per platform and is measured, never assumed.

Trait Implementations

impl Clone for AggregableKind

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 AggregableKind

impl Debug for AggregableKind

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

Formats the value using the given formatter.

impl Eq for AggregableKind

impl PartialEq for AggregableKind

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for AggregableKind