Struct DeferredEncoding

pub struct DeferredEncoding {
    pub buffer_location: u64,
    pub buffer_length: u64,
}

The deferred encoding is used to place the encoding itself in a different part of the file. This is most commonly used to allow encodings to be shared across different columns. For example, when writing a file with thousands of columns, where many pages have the exact same encoding, it can be useful to cut down on the size of the metadata by using a deferred encoding.

Fields

buffer_location: u64

Location of the buffer containing the encoding.

• If sharing encodings across columns then this will be in a global buffer
• If sharing encodings across pages within a column this could be in a column metadata buffer.
• This could also be a page buffer if the encoding is not shared, needs to be written before the file ends, and the encoding is too large to load unless we first determine the page needs to be read. This combination seems unusual.

buffer_length: u64

Trait Implementations

impl Clone for DeferredEncoding

fn clone(&self) -> DeferredEncoding

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DeferredEncoding

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

Formats the value using the given formatter.

impl Default for DeferredEncoding

fn default() -> Self

Returns the “default value” for a type.

impl Message for DeferredEncoding

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited( &self, buf: &mut impl BufMut, ) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq for DeferredEncoding

fn eq(&self, other: &DeferredEncoding) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for DeferredEncoding

impl StructuralPartialEq for DeferredEncoding