Struct MetadataCache 

pub struct MetadataCache { /* private fields */ }

Global LRU cache for partition metadata, shared across all readers and queries.

Memory budget is based on serialized metadata size.

Implementations

impl MetadataCache

pub fn new(max_capacity_bytes: u64) -> Self

Creates a new metadata cache with the specified memory budget in bytes.

pub async fn get(&self, file_path: &str) -> Option<Arc<ParquetMetaData>>

Gets cached metadata for the given file path, if present.

pub async fn insert( &self, file_path: String, metadata: Arc<ParquetMetaData>, serialized_size: u32, )

Inserts metadata into the cache with its serialized size for weight calculation.

pub fn stats(&self) -> (u64, u64)

Returns cache statistics (entry_count, weighted_size_bytes).

Trait Implementations

impl Debug for MetadataCache

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

Formats the value using the given formatter.

impl Default for MetadataCache

fn default() -> Self

Returns the “default value” for a type.