Struct DegreeStats 

pub struct DegreeStats {
    pub min: u32,
    pub max: u32,
    pub total: u64,
    pub count: u64,
}

Per-relationship-type degree statistics collected at engine open time.

Built once from CSR forward files (checkpointed edges) by scanning every source slot’s out-degree for each relationship type. Delta-log edges are included via the same delta_all scan already performed for DegreeCache.

Used by future join-order heuristics: mean() gives an estimate of how many hops a traversal on this relationship type will produce per source node.

Fields

min: u32

Minimum out-degree seen across all source nodes for this rel type.

max: u32

Maximum out-degree seen across all source nodes for this rel type.

total: u64

Sum of all per-node out-degrees (numerator of the mean).

count: u64

Number of source nodes contributing to total (denominator of the mean).

Implementations

impl DegreeStats

pub fn mean(&self) -> f64

Mean out-degree for this relationship type.

Returns 1.0 when no edges exist to avoid division-by-zero and because an unknown degree is conservatively assumed to be at least 1.

Trait Implementations

impl Clone for DegreeStats

fn clone(&self) -> DegreeStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DegreeStats

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

Formats the value using the given formatter.

impl Default for DegreeStats

fn default() -> DegreeStats

Returns the “default value” for a type.