Struct CachingStore 

pub struct CachingStore<T: ObjectStore> { /* private fields */ }

An ObjectStore wrapper that caches head() and small get_range() responses.

After Z-ORDER compaction the Parquet files backing Delta tables are immutable: the same path always returns the same bytes. Caching the metadata calls that DataFusion issues on every query (HEAD for file size, then GET-range for the footer) eliminates redundant cloud round-trips.

All mutating and streaming methods delegate directly to the inner store.

Implementations

impl<T: ObjectStore> CachingStore<T>

pub fn new(inner: T, range_cache_max_bytes: u64) -> Self

Create a new caching wrapper.

• inner – the concrete object store to wrap.
• range_cache_max_bytes – maximum total weight of the range cache (each entry is weighed by its byte length).

Trait Implementations

impl<T: Debug + ObjectStore> Debug for CachingStore<T>

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

Formats the value using the given formatter.

impl<T: ObjectStore> Display for CachingStore<T>

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

Formats the value using the given formatter.

impl<T: ObjectStore> ObjectStore for CachingStore<T>

fn put_opts<'life0, 'life1, 'async_trait>( &'life0 self, location: &'life1 Path, payload: PutPayload, opts: PutOptions, ) -> Pin<Box<dyn Future<Output = Result<PutResult>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Save the provided payload to location with the given options

fn put_multipart_opts<'life0, 'life1, 'async_trait>( &'life0 self, location: &'life1 Path, opts: PutMultipartOptions, ) -> Pin<Box<dyn Future<Output = Result<Box<dyn MultipartUpload>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Perform a multipart upload with options

fn get_opts<'life0, 'life1, 'async_trait>( &'life0 self, location: &'life1 Path, options: GetOptions, ) -> Pin<Box<dyn Future<Output = Result<GetResult>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Perform a get request with options

fn delete<'life0, 'life1, 'async_trait>( &'life0 self, location: &'life1 Path, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Delete the object at the specified location.

fn list(&self, prefix: Option<&Path>) -> BoxStream<'static, Result<ObjectMeta>>

List all the objects with the given prefix.

fn list_with_delimiter<'life0, 'life1, 'async_trait>( &'life0 self, prefix: Option<&'life1 Path>, ) -> Pin<Box<dyn Future<Output = Result<ListResult>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

List objects with the given prefix and an implementation specific delimiter. Returns common prefixes (directories) in addition to object metadata.

fn copy<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, from: &'life1 Path, to: &'life2 Path, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Copy an object from one path to another in the same object store.

fn copy_if_not_exists<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, from: &'life1 Path, to: &'life2 Path, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Copy an object from one path to another, only if destination is empty.

fn head<'life0, 'life1, 'async_trait>( &'life0 self, location: &'life1 Path, ) -> Pin<Box<dyn Future<Output = Result<ObjectMeta>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Return the metadata for the specified location

fn get_range<'life0, 'life1, 'async_trait>( &'life0 self, location: &'life1 Path, range: Range<u64>, ) -> Pin<Box<dyn Future<Output = Result<Bytes>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Return the bytes that are stored at the specified location in the given byte range.

fn put<'life0, 'life1, 'async_trait>( &'life0 self, location: &'life1 Path, payload: PutPayload, ) -> Pin<Box<dyn Future<Output = Result<PutResult, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, Self: 'async_trait,

Save the provided bytes to the specified location

fn put_multipart<'life0, 'life1, 'async_trait>( &'life0 self, location: &'life1 Path, ) -> Pin<Box<dyn Future<Output = Result<Box<dyn MultipartUpload>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, Self: 'async_trait,

Perform a multipart upload

fn get<'life0, 'life1, 'async_trait>( &'life0 self, location: &'life1 Path, ) -> Pin<Box<dyn Future<Output = Result<GetResult, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, Self: 'async_trait,

Return the bytes that are stored at the specified location.

fn get_ranges<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, location: &'life1 Path, ranges: &'life2 [Range<u64>], ) -> Pin<Box<dyn Future<Output = Result<Vec<Bytes>, Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Return the bytes that are stored at the specified location in the given byte ranges

fn delete_stream<'a>( &'a self, locations: Pin<Box<dyn Stream<Item = Result<Path, Error>> + Send + 'a>>, ) -> Pin<Box<dyn Stream<Item = Result<Path, Error>> + Send + 'a>>

Delete all the objects at the specified locations

fn list_with_offset( &self, prefix: Option<&Path>, offset: &Path, ) -> Pin<Box<dyn Stream<Item = Result<ObjectMeta, Error>> + Send>>

List all the objects with the given prefix and a location greater than offset

fn rename<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, from: &'life1 Path, to: &'life2 Path, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Move an object from one path to another in the same object store.

fn rename_if_not_exists<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, from: &'life1 Path, to: &'life2 Path, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, Self: 'async_trait,

Move an object from one path to another in the same object store.