Struct mz_repr::row::ProtoDatum

pub struct ProtoDatum {
    pub datum_type: Option<DatumType>,
}

Fields

datum_type: Option<DatumType>

NB: Proto oneof ids 1..=15 get encoded in 1 byte and so we should reserve them for the datum types we expect to be most popular.

Null, False, and True are all likely to be frequent, but the encoded length is exactly the same if they’re here or in ProtoDatumOther. In general, anything that can be encoded purely as a proto enum variant (i.e. doesn’t have a payload) is better off that way. If we run out of 1-byte encodings of ProtoDatumOther, we can always add ProtoDatumOther2.

Trait Implementations

impl Clone for ProtoDatum

fn clone(&self) -> ProtoDatum

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ProtoDatum

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

Formats the value using the given formatter.

impl Default for ProtoDatum

fn default() -> Self

Returns the “default value” for a type.

impl<'a> From<Datum<'a>> for ProtoDatum

fn from(x: Datum<'a>) -> Self

Converts to this type from the input type.

impl Message for ProtoDatum

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<B>(&self, buf: &mut B) -> Result<(), EncodeError>where
    B: BufMut,

Encodes the message to a buffer.

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

Encodes the message to a newly allocated buffer.

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

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

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

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

fn decode<B>(buf: B) -> Result<Self, DecodeError>where
    B: Buf,
    Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited<B>(buf: B) -> Result<Self, DecodeError>where
    B: Buf,
    Self: Default,

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

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

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

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

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

impl PartialEq<ProtoDatum> for ProtoDatum

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl StructuralPartialEq for ProtoDatum