Struct datafusion_execution::cache::cache_unit::DefaultFileStatisticsCache

pub struct DefaultFileStatisticsCache { /* private fields */ }

Collected statistics for files Cache is invalided when file size or last modification has changed

Trait Implementations

impl CacheAccessor<Path, Arc<Statistics>> for DefaultFileStatisticsCache

fn get(&self, k: &Path) -> Option<Arc<Statistics>>

Get Statistics for file location.

fn get_with_extra(&self, k: &Path, e: &Self::Extra) -> Option<Arc<Statistics>>

Get Statistics for file location. Returns None if file has changed or not found.

fn put(&self, _key: &Path, _value: Arc<Statistics>) -> Option<Arc<Statistics>>

Save collected file statistics

type Extra = ObjectMeta

fn put_with_extra( &self, key: &Path, value: Arc<Statistics>, e: &Self::Extra, ) -> Option<Arc<Statistics>>

Put value into cache. Returns the old value associated with the key if there was one.

fn remove(&mut self, k: &Path) -> Option<Arc<Statistics>>

Remove an entry from the cache, returning value if they existed in the map.

fn contains_key(&self, k: &Path) -> 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 or not.

impl Default for DefaultFileStatisticsCache

fn default() -> DefaultFileStatisticsCache

Returns the “default value” for a type.