Struct PlanCache 

pub struct PlanCache { /* private fields */ }

LRU cache for query plans

Maps SQL strings to optimized LogicalPlans with configurable max size. Supports cache invalidation on schema changes (DDL).

Implementations

impl PlanCache

pub fn new(max_size: usize) -> Self

Create a new plan cache with the specified maximum size

pub fn default_size() -> Self

Create a plan cache with default size (1000 entries)

pub fn get(&self, sql: &str) -> Option<PreparedStatement>

Get a cached plan, if available

pub fn insert(&self, sql: String, stmt: PreparedStatement)

Insert a prepared statement into the cache

pub fn invalidate_all(&self)

Invalidate all cached plans (called on schema changes)

pub fn invalidate_table(&self, table_name: &str)

Invalidate plans for a specific table

pub fn next_id(&self) -> u64

Get the next statement ID

pub fn schema_version(&self) -> u64

Get the current schema version

pub fn stats(&self) -> &CacheStats

Get cache statistics

pub fn len(&self) -> usize

Get the number of cached entries

pub fn is_empty(&self) -> bool

Check if the cache is empty

pub fn max_size(&self) -> usize

Get the maximum cache size

Trait Implementations

impl Debug for PlanCache

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

Formats the value using the given formatter.

impl Default for PlanCache

fn default() -> Self

Returns the “default value” for a type.