Enum CostModelKind 

pub enum CostModelKind {
    SkewClassifier,
    Cardinality,
}

Cost-model selector for WCOJ dispatch.

Variants

SkewClassifier

Legacy skew-classifier opt-out selector.

The GPU skew-classifier surface is absent, so this selector is implemented as a conservative opt-out from stats/cardinality dispatch.

Cardinality

Stats/cardinality-backed dispatch selector.

Trait Implementations

impl Clone for CostModelKind

fn clone(&self) -> CostModelKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CostModelKind

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

Formats the value using the given formatter.

impl PartialEq for CostModelKind

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for CostModelKind

impl Eq for CostModelKind

impl StructuralPartialEq for CostModelKind