Enum PlanReason 

pub enum PlanReason {
    LexicalIndex,
    SparseIndex,
    RequestedExact,
    AnnReady,
    AnnUnavailable,
    FilterRequiresExact,
    OperatorRequiresExact,
    LowerEstimatedCost,
    LowerCalibratedLatency,
}

Variants

LexicalIndex

Index over a lexical/BM25 posting list.

SparseIndex

Index over a sparse inverted index.

RequestedExact

Caller explicitly requested exact execution.

AnnReady

ANN graph available and selected by availability heuristic.

AnnUnavailable

ANN graph not built; falling back to exact scan.

FilterRequiresExact

Filter present; selectivity too low or post-filter disabled.

OperatorRequiresExact

Operator does not support ANN (e.g. named multivector exact-only).

LowerEstimatedCost

Cost model estimated exact cheaper than HNSW for this corpus size.

LowerCalibratedLatency

Runtime calibration estimated lower p90 latency for this hardware.

Trait Implementations

impl Clone for PlanReason

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 PlanReason

impl Debug for PlanReason

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

Formats the value using the given formatter.

impl Eq for PlanReason

impl PartialEq for PlanReason

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for PlanReason

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for PlanReason