Struct MaterializedView 

pub struct MaterializedView {
    pub definition: ViewDefinition,
    pub rows: Vec<HashMap<String, String>>,
    pub row_count: usize,
    pub last_updated: Instant,
    pub update_count: u64,
    pub is_stale: bool,
}

The current materialized state of a SPARQL view.

Each row is a variable binding map {variable_name → value}.

Fields

definition: ViewDefinition

Definition driving this view.

rows: Vec<HashMap<String, String>>

Cached result rows.

row_count: usize

Snapshot of rows.len() for quick access.

last_updated: Instant

When the view data was last refreshed.

update_count: u64

Cumulative number of times this view has been refreshed.

is_stale: bool

Whether the view needs to be re-evaluated before it can be used.

Implementations

impl MaterializedView

pub fn new( definition: ViewDefinition, initial_rows: Vec<HashMap<String, String>>, ) -> Self

Construct a new MaterializedView from a definition and an initial result set.

pub fn apply_deltas(&mut self, deltas: &[TripleDelta]) -> bool

Apply a batch of deltas, marking this view stale if any delta affects it.

Returns true if the view was newly marked stale by this call.

pub fn is_affected_by(&self, delta: &TripleDelta) -> bool

Return true if delta could affect this view’s result set.

A view is considered affected when:

• Its accessed_predicates list is empty (depends on everything), or
• The delta’s predicate appears in accessed_predicates.

pub fn refresh(&mut self, new_rows: Vec<HashMap<String, String>>)

Replace the cached rows with new_rows and clear the stale flag.