Struct CachedResult 

pub struct CachedResult {
    pub fingerprint: QueryFingerprint,
    pub column_names: Vec<String>,
    pub rows: CompactArc<Vec<Row>>,
    pub predicate: Option<Expression>,
    pub cached_at: Instant,
    pub last_accessed: Instant,
    pub access_count: u64,
    pub estimated_bytes: usize,
}

Cached query result with metadata

Fields

fingerprint: QueryFingerprint

The fingerprint identifying this query pattern

column_names: Vec<String>

Column names in order

rows: CompactArc<Vec<Row>>

Cached rows (Arc for zero-copy sharing on cache hits)

predicate: Option<Expression>

The original WHERE predicate (for subsumption checking)

cached_at: Instant

When this entry was cached

last_accessed: Instant

Last access time (for LRU eviction)

access_count: u64

Access count

estimated_bytes: usize

Conservative estimate of memory retained by the cached rows.

Implementations

impl CachedResult

pub fn new( fingerprint: QueryFingerprint, column_names: Vec<String>, rows: Vec<Row>, predicate: Option<Expression>, ) -> Self

Create a new cached result

pub fn new_with_arc( fingerprint: QueryFingerprint, column_names: Vec<String>, rows: CompactArc<Vec<Row>>, predicate: Option<Expression>, ) -> Self

Create a new cached result with pre-wrapped Arc (avoids clone)

Use this when the caller already has a CompactArc<Vec<Row>> to avoid an extra allocation and copy.

pub fn is_expired(&self, ttl: Duration) -> bool

Check if this cached result has expired

pub fn is_expired_at(&self, ttl: Duration, now: Instant) -> bool

Check if this cached result has expired, using a pre-computed now instant. Avoids repeated Instant::now() calls (each is a syscall on macOS).

pub fn record_access(&mut self)

Record an access to this cached result

Trait Implementations

impl Clone for CachedResult

fn clone(&self) -> CachedResult

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CachedResult

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

Formats the value using the given formatter.