Struct Request 

pub struct Request { /* private fields */ }

One read, with the buffer its bytes land in.

The length wanted is the length of the buffer. There is no separate length field because two fields that have to agree are two fields that disagree eventually.

Implementations

impl Request

pub fn new(offset: u64, len: usize) -> Self

A read of len bytes at offset, into a buffer allocated here.

pub fn reusing(offset: u64, buf: Vec<u8>) -> Self

A read at offset into a buffer the caller already has.

The buffer’s length is the length of the read, and its contents are overwritten. This is the form a scan uses on its second row group, because the alternative is allocating a column’s worth of page buffers per row group for the life of the query.

pub fn offset(&self) -> u64

Where in the file the read starts.

pub fn len(&self) -> usize

How many bytes are wanted.

pub fn is_empty(&self) -> bool

Whether this request asks for nothing.

pub fn end(&self) -> u64

One past the last byte wanted.

pub fn into_buffer(self) -> Vec<u8>

The destination buffer, taken out of the request.

Trait Implementations

impl Debug for Request

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

Formats the value using the given formatter.