Enum ScanReason 

pub enum ScanReason {
    BelowGraphThreshold {
        rows: u32,
        min_rows: u32,
    },
    GraphPending,
    ActiveSegment,
    FullMaterialization,
    WideningCap {
        ef: usize,
        rows: usize,
    },
    ExplicitTier(ExplicitScanTier),
}

Why one segment was served without graph traversal.

These are capacity and caller-choice reasons only. Graph integrity and validation failures remain typed query errors and never become reasons for a quiet scan.

Variants

BelowGraphThreshold

The immutable segment has not reached the measured graph crossover.

Fields

rows: u32

Dense rows in the segment.

min_rows: u32

Minimum rows required by the segment’s policy bucket.

GraphPending

The segment is eligible, but its graph has not been published yet.

ActiveSegment

The mutable unsealed tail cannot carry a graph.

FullMaterialization

Hybrid widening requested the complete corpus.

WideningCap

Hybrid widening made graph traversal more expensive than exact scan.

Fields

ef: usize

Candidate pool the graph would have visited.

rows: usize

Rows used to evaluate the widening cap.

ExplicitTier(ExplicitScanTier)

The caller explicitly selected a scan tier.

Trait Implementations

impl Clone for ScanReason

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 ScanReason

impl Debug for ScanReason

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

Formats the value using the given formatter.

impl Eq for ScanReason

impl PartialEq for ScanReason

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ScanReason