Struct DefaultFileStatisticsCache 

pub struct DefaultFileStatisticsCache { /* private fields */ }

Default implementation of FileStatisticsCache

Stores cached file metadata (statistics and orderings) for files.

The typical usage pattern is:

1. Call get(path) to check for cached value
2. If Some(cached), validate with cached.is_valid_for(&current_meta)
3. If invalid or missing, compute new value and call put(path, new_value)

Internal details

The memory_limit controls the maximum size of the cache, which uses a Least Recently Used eviction algorithm. When adding a new entry, if the total size of the cached entries exceeds memory_limit, the least recently used entries are evicted until the total size is lower than memory_limit.

Implementations

impl DefaultFileStatisticsCache

pub fn new(memory_limit: usize) -> Self

pub fn memory_used(&self) -> usize

Returns the size of the cached memory, in bytes.

Trait Implementations

impl CacheAccessor<TableScopedPath, CachedFileMetadata> for DefaultFileStatisticsCache

fn get(&self, key: &TableScopedPath) -> Option<CachedFileMetadata>

Get a cached entry if it exists.

fn put( &self, key: &TableScopedPath, value: CachedFileMetadata, ) -> Option<CachedFileMetadata>

Store a value in the cache.

fn remove(&self, key: &TableScopedPath) -> Option<CachedFileMetadata>

Remove an entry from the cache, returning the value if it existed.

fn contains_key(&self, k: &TableScopedPath) -> bool

Check if the cache contains a specific key.

fn len(&self) -> usize

Fetch the total number of cache entries.

fn clear(&self)

Remove all entries from the cache.

fn name(&self) -> String

Return the cache name.

fn is_empty(&self) -> bool

Check if the cache collection is empty.

impl Default for DefaultFileStatisticsCache

fn default() -> DefaultFileStatisticsCache

Returns the “default value” for a type.

impl FileStatisticsCache for DefaultFileStatisticsCache

fn cache_limit(&self) -> usize

Cache memory limit in bytes.

fn update_cache_limit(&self, limit: usize)

Updates the cache with a new memory limit in bytes.

fn list_entries(&self) -> HashMap<TableScopedPath, FileStatisticsCacheEntry>

Retrieves the information about the entries currently cached.

fn drop_table_entries(&self, table_ref: &Option<TableReference>) -> Result<()>