risingwave_common::row::once

Struct Once

pub struct Once<D>(D);

Expand description

Row for the once function.

Tuple Fields§

§0: D

Trait Implementations§

impl<D: Clone> Clone for Once<D>

fn clone(&self) -> Once<D>

Returns a copy of the value. Read more

1.0.0 · source§

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

Performs copy-assignment from source. Read more

impl<D: Debug> Debug for Once<D>

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

Formats the value using the given formatter. Read more

impl<D: PartialEq> PartialEq for Once<D>

fn eq(&self, other: &Once<D>) -> bool

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

1.0.0 · source§

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<D: ToDatumRef> Row for Once<D>

fn datum_at(&self, index: usize) -> DatumRef<'_>

Returns the DatumRef at the given index.

unsafe fn datum_at_unchecked(&self, _index: usize) -> DatumRef<'_>

Returns the DatumRef at the given index without bounds checking. Read more

fn len(&self) -> usize

Returns the number of datum in the row.

fn iter(&self) -> impl ExactSizeIterator<Item = DatumRef<'_>>

Returns an iterator over the datums in the row, in DatumRef form.

fn is_empty(&self) -> bool

Returns true if the row contains no datum.

fn to_owned_row(&self) -> OwnedRow

Converts the row into an OwnedRow. Read more

fn into_owned_row(self) -> OwnedRow

Consumes self and converts it into an OwnedRow.

fn value_serialize_into(&self, buf: impl BufMut)

Serializes the row with value encoding, into the given buf.

fn value_serialize(&self) -> Vec<u8> ⓘ

Serializes the row with value encoding and returns the bytes.

fn value_serialize_bytes(&self) -> Bytes

Serializes the row with value encoding and returns the bytes.

fn value_estimate_size(&self) -> usize

fn memcmp_serialize_into(&self, serde: &OrderedRowSerde, buf: impl BufMut)

Serializes the row with memcomparable encoding, into the given buf. As each datum may have different order type, a serde should be provided.

fn memcmp_serialize(&self, serde: &OrderedRowSerde) -> Vec<u8> ⓘ

Serializes the row with memcomparable encoding and return the bytes. As each datum may have different order type, a serde should be provided.

fn hash_datums_into<H: Hasher>(&self, state: &mut H)

Hash the datums of this row into the given hasher. Read more

fn hash<H: BuildHasher>(&self, hash_builder: H) -> HashCode<H>

Returns the hash code of the row.

fn eq(this: &Self, other: impl Row) -> bool

Determines whether the datums of this row are equal to those of another.

impl<D: Copy> Copy for Once<D>

impl<D: Eq> Eq for Once<D>

impl<D> StructuralPartialEq for Once<D>

Auto Trait Implementations§

impl<D> Freeze for Once<D>
where D: Freeze,

impl<D> RefUnwindSafe for Once<D>
where D: RefUnwindSafe,

impl<D> Send for Once<D>
where D: Send,

impl<D> Sync for Once<D>
where D: Sync,

impl<D> Unpin for Once<D>
where D: Unpin,

impl<D> UnwindSafe for Once<D>
where D: UnwindSafe,

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> CloneToUninit for T
where T: Clone,

unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)

Performs copy-assignment from self to dst. Read more

impl<R> DefaultOrd for R
where R: Row,

fn default_cmp(&self, other: &R) -> Ordering

impl<R> DefaultPartialOrd for R
where R: Row,

fn default_partial_cmp(&self, other: &R) -> Option<Ordering>

impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more

impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.

impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.

impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more

impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> FromRef<T> for T
where T: Clone,

fn from_ref(input: &T) -> T

Converts to this type from a reference to the input type.

impl<T> FutureExt for T

fn with_context(self, otel_cx: Context) -> WithContext<Self>

Attaches the provided Context to this type, returning a WithContext wrapper. Read more

fn with_current_context(self) -> WithContext<Self>

Attaches the current Context to this type, returning a WithContext wrapper. Read more

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T> IntoEither for T

fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

impl<T> IntoRequest<T> for T

fn into_request(self) -> Request<T>

Wrap the input message T in a tonic::Request

impl<T> IntoResult<T> for T

type Err = Infallible

fn into_result(self) -> Result<T, <T as IntoResult<T>>::Err>

impl<M> MetricVecRelabelExt for M

fn relabel( self, metric_level: MetricLevel, relabel_threshold: MetricLevel, ) -> RelabeledMetricVec<M>

Equivalent to RelabeledMetricVec::with_metric_level.

fn relabel_n( self, metric_level: MetricLevel, relabel_threshold: MetricLevel, relabel_num: usize, ) -> RelabeledMetricVec<M>

Equivalent to RelabeledMetricVec::with_metric_level_relabel_n.

fn relabel_debug_1( self, relabel_threshold: MetricLevel, ) -> RelabeledMetricVec<M>

Equivalent to RelabeledMetricVec::with_metric_level_relabel_n with metric_level set to MetricLevel::Debug and relabel_num set to 1.

impl<T> Pointable for T

const ALIGN: usize = _

The alignment of pointer.

type Init = T

The type for initializers.

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more

impl<R> RowExt for R
where R: Row,

fn chain<R: Row>(self, other: R) -> Chain<Self, R>
where Self: Sized,

Adapter for chaining two rows together.

fn project(self, indices: &[usize]) -> Project<'_, Self>
where Self: Sized,

Adapter for projecting a row onto a subset of its columns with the given indices. Read more

fn slice(self, range: impl RangeBounds<usize>) -> Slice<Self>
where Self: Sized,

Adapter for slicing a row with the given range. Read more

fn display(&self) -> impl Display + '_

fn is_null_at(&self, index: usize) -> bool

impl<T> Same for T

type Output = T

Should always be Self

impl<T> ToOwned for T
where T: Clone,

type Owned = T

The resulting type after obtaining ownership.

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

fn vzip(self) -> V

impl<T> WithSubscriber for T

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more

impl<T> WithSubscriber for T

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more

impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,

impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,

impl<T> DevConfig for T
where T: Send + Sync + 'static + Debug,

impl<T> LruValue for T
where T: Send + Sync,

impl<T> Value for T
where T: Send + Sync + 'static,