Struct QueryPattern 

pub struct QueryPattern {
    pub subject: Option<NodeId>,
    pub predicate: Option<NodeId>,
    pub object: Option<NodeId>,
}

Query pattern with bound/unbound positions

Fields

subject: Option<NodeId>

Subject node ID (None = wildcard)

predicate: Option<NodeId>

Predicate node ID (None = wildcard)

object: Option<NodeId>

Object node ID (None = wildcard)

Implementations

impl QueryPattern

pub fn new(s: Option<NodeId>, p: Option<NodeId>, o: Option<NodeId>) -> Self

Create a new query pattern

pub fn is_exact(&self) -> bool

Check if all positions are bound (exact match)

pub fn is_full_scan(&self) -> bool

Check if all positions are unbound (full scan)

pub fn bound_count(&self) -> usize

Count number of bound positions

pub fn selectivity(&self) -> f64

Get selectivity factor (0.0 = very selective, 1.0 = not selective)

More bound positions = more selective = lower selectivity factor

Trait Implementations

impl Clone for QueryPattern

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryPattern

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

Formats the value using the given formatter.

impl Default for QueryPattern

fn default() -> Self

Returns the “default value” for a type.

impl Eq for QueryPattern

impl Hash for QueryPattern

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for QueryPattern

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for QueryPattern