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PopcountFunction

sql_cli::sql::functions::bitwise

Struct PopcountFunction

pub struct PopcountFunction;

Expand description

POPCOUNT(n) - Population count: number of set bits in an integer.

This is the canonical CPU/intrinsic name for what COUNT_BITS also does, and is polymorphic with BIT_COUNT (which also accepts binary strings).

Trait Implementations§

impl SqlFunction for PopcountFunction

fn signature(&self) -> FunctionSignature

Get the function’s signature and metadata

fn evaluate(&self, args: &[DataValue]) -> Result<DataValue>

Evaluate the function with the given arguments

fn validate_args(&self, args: &[DataValue]) -> Result<()>

Validate arguments before evaluation (default implementation checks count)

Auto Trait Implementations§

impl Freeze for PopcountFunction

impl RefUnwindSafe for PopcountFunction

impl Send for PopcountFunction

impl Sync for PopcountFunction

impl Unpin for PopcountFunction

impl UnsafeUnpin for PopcountFunction

impl UnwindSafe for PopcountFunction

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,

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Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

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

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

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Calls U::from(self).

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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

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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

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type Output = T

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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
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fn vzip(self) -> V

impl<T> WithSubscriber for T

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

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