Struct MaterializedView 

pub struct MaterializedView {
    pub name: String,
    pub query: Vec<Predicate>,
    pub results: Vec<Vec<Term>>,
    pub last_refresh: SystemTime,
    pub ttl: Option<Duration>,
    pub access_count: usize,
    pub total_cost_saved: f64,
}

Materialized view metadata

Fields

name: String

Unique view name

query: Vec<Predicate>

Query pattern that defines this view

results: Vec<Vec<Term>>

Precomputed results

last_refresh: SystemTime

Time when the view was created/refreshed

ttl: Option<Duration>

Time-to-live before refresh needed

access_count: usize

Statistics about view usage

total_cost_saved: f64

Total cost saved by using this view

Implementations

impl MaterializedView

pub fn new(name: String, query: Vec<Predicate>) -> Self

Create a new materialized view

pub fn with_ttl(name: String, query: Vec<Predicate>, ttl: Duration) -> Self

Create with TTL

pub fn needs_refresh(&self) -> bool

Check if view needs refresh based on TTL

pub fn refresh(&mut self, results: Vec<Vec<Term>>)

Refresh the view with new results

pub fn record_access(&mut self, cost_saved: f64)

Record a view access

pub fn matches_query(&self, query: &[Predicate]) -> bool

Check if query matches this view

Trait Implementations

impl Clone for MaterializedView

fn clone(&self) -> MaterializedView

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MaterializedView

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for MaterializedView

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for MaterializedView

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

where __S: Serializer,

Serialize this value into the given Serde serializer.