Struct FileByteSource 

pub struct FileByteSource { /* private fields */ }

Available on crate features async and polars-io only.

Byte source backed by a File.

Implementations

impl FileByteSource

pub fn try_new_from_std( file: File, read_context: FileReadContext, io_metrics: Option<Arc<IOMetrics>>, ) -> Result<FileByteSource, PolarsError>

pub fn set_io_metrics( &mut self, io_metrics: Option<Arc<IOMetrics>>, ) -> &mut FileByteSource

pub fn io_metrics(&self) -> &OptIOMetrics

Trait Implementations

impl ByteSource for FileByteSource

async fn get_size(&self) -> Result<usize, PolarsError>

async fn get_suffix(&self, n: usize) -> Result<(Buffer<u8>, usize), PolarsError>

Fetch the last n bytes and the total size of the source, in a single request. Returns fewer than n bytes if the source is smaller than n.

async fn get_range( &self, range: Range<usize>, ) -> Result<Buffer<u8>, PolarsError>

Panics

async fn get_ranges( &self, ranges: &mut [Range<usize>], ) -> Result<HashMap<usize, Buffer<u8>, RandomState>, PolarsError>

Note: This will mutably sort ranges for coalescing.

impl From<FileByteSource> for DynByteSource

fn from(value: FileByteSource) -> DynByteSource

Converts to this type from the input type.