Struct Feature

#[repr(transparent)]
pub struct Feature(pub i64);

Represents Arrow Features that might not have full support within implementations. This is intended to be used in two scenarios:

1. A mechanism for readers of Arrow Streams and files to understand that the stream or file makes use of a feature that isn’t supported or unknown to the implementation (and therefore can meet the Arrow forward compatibility guarantees).
2. A means of negotiating between a client and server what features a stream is allowed to use. The enums values here are intented to represent higher level features, additional details maybe negotiated with key-value pairs specific to the protocol.

Enums added to this list should be assigned power-of-two values to facilitate exchanging and comparing bitmaps for supported features.

Tuple Fields

0: i64

Implementations

impl Feature

pub const UNUSED: Feature

Needed to make flatbuffers happy.

pub const DICTIONARY_REPLACEMENT: Feature

The stream makes use of multiple full dictionaries with the same ID and assumes clients implement dictionary replacement correctly.

pub const COMPRESSED_BODY: Feature

The stream makes use of compressed bodies as described in Message.fbs.

pub const ENUM_MIN: i64 = 0i64

pub const ENUM_MAX: i64 = 2i64

pub const ENUM_VALUES: &'static [Feature]

pub fn variant_name(self) -> Option<&'static str>

Returns the variant’s name or “” if unknown.

Trait Implementations

impl Clone for Feature

fn clone(&self) -> Feature

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Feature

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

Formats the value using the given formatter.

impl Default for Feature

fn default() -> Feature

Returns the “default value” for a type.

impl EndianScalar for Feature

type Scalar = i64

fn to_little_endian(self) -> i64

fn from_little_endian(v: i64) -> Feature

impl<'a> Follow<'a> for Feature

type Inner = Feature

unsafe fn follow(buf: &'a [u8], loc: usize) -> <Feature as Follow<'a>>::Inner

Safety

impl Hash for Feature

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Feature

fn cmp(&self, other: &Feature) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Feature

fn eq(&self, other: &Feature) -> 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 PartialOrd for Feature

fn partial_cmp(&self, other: &Feature) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Push for Feature

type Output = Feature

unsafe fn push(&self, dst: &mut [u8], _written_len: usize)

Safety

fn size() -> usize

fn alignment() -> PushAlignment

impl<'a> Verifiable for Feature

fn run_verifier( v: &mut Verifier<'_, '_>, pos: usize, ) -> Result<(), InvalidFlatbuffer>

Runs the verifier for this type, assuming its at position pos in the verifier’s buffer. Should not need to be called directly.

impl Copy for Feature

impl Eq for Feature

impl SimpleToVerifyInSlice for Feature

impl StructuralPartialEq for Feature