Trait FileStatisticsCache 

pub trait FileStatisticsCache: CacheAccessor<TableScopedPath, CachedFileMetadata> {
    // Required methods
    fn cache_limit(&self) -> usize;
    fn update_cache_limit(&self, limit: usize);
    fn list_entries(&self) -> HashMap<TableScopedPath, FileStatisticsCacheEntry>;
    fn drop_table_entries(
        &self,
        table_ref: &Option<TableReference>,
    ) -> Result<()>;
}

A cache for file statistics and orderings.

This cache stores CachedFileMetadata which includes:

• File metadata for validation (size, last_modified)
• Statistics for the file
• Ordering information for the file

If enabled via CacheManagerConfig::with_file_statistics_cache this cache avoids inferring the same file statistics repeatedly during the session lifetime.

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)

See crate::runtime_env::RuntimeEnv for more details

Required Methods

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<()>

Trait Implementations

impl Debug for dyn FileStatisticsCache

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

Formats the value using the given formatter.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl FileStatisticsCache for DefaultFileStatisticsCache