datafusion_execution::cache::cache_unit

Struct DefaultFileStatisticsCache

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pub struct DefaultFileStatisticsCache { /* private fields */ }
Expand description

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

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

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

Get Statistics for file location.

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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.

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

Save collected file statistics

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type Extra = ObjectMeta

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

Remove an entry from the cache, returning value if they existed in the map.
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fn contains_key(&self, k: &Path) -> bool

Check if the cache contains a specific key.
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fn len(&self) -> usize

Fetch the total number of cache entries.
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fn clear(&self)

Remove all entries from the cache.
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fn name(&self) -> String

Return the cache name.
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fn is_empty(&self) -> bool

Check if the Cache collection is empty or not.
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impl Default for DefaultFileStatisticsCache

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fn default() -> DefaultFileStatisticsCache

Returns the “default value” for a type. Read more

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