Struct CountingSink

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pub struct CountingSink { /* private fields */ }

Expand description

Counting sink that just counts rows without storing data.

Useful for COUNT(*) queries where only the count matters.

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impl CountingSink

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pub fn new() -> Self

Create a new counting sink.

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pub fn count(&self) -> usize

Get the count.

Trait Implementations§

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impl Default for CountingSink

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fn default() -> Self

Returns the “default value” for a type. Read more

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impl Sink for CountingSink

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fn consume(&mut self, chunk: DataChunk) -> Result<bool, OperatorError>

Consume a chunk of data. Read more

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fn finalize(&mut self) -> Result<(), OperatorError>

Called when all input has been processed.

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fn name(&self) -> &'static str

Name of this sink for debugging.

Auto Trait Implementations§

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impl UnwindSafe for CountingSink

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

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

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> IntoEither for T

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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

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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

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