Struct arrow::array::Scalar

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pub struct Scalar<T>(/* private fields */)
where
    T: Array;
Expand description

A wrapper around a single value Array that implements Datum and indicates compute kernels should treat this array as a scalar value (a single value).

Using a Scalar is often much more efficient than creating an Array with the same (repeated) value.

See Datum for more information.

§Example

// Create a (typed) scalar for Int32Array for the value 42
let scalar = Scalar::new(Int32Array::from(vec![42]));

// Create a scalar using PrimtiveArray::scalar
let scalar = Int32Array::new_scalar(42);

// create a scalar from an ArrayRef (for dynamic typed Arrays)
let array: ArrayRef = get_array();
let scalar = Scalar::new(array);

Implementations§

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impl<T> Scalar<T>
where T: Array,

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pub fn new(array: T) -> Scalar<T>

Create a new Scalar from an Array

§Panics

Panics if array.len() != 1

Trait Implementations§

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impl<T> Clone for Scalar<T>
where T: Clone + Array,

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fn clone(&self) -> Scalar<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T> Datum for Scalar<T>
where T: Array,

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fn get(&self) -> (&dyn Array, bool)

Returns the value for this Datum and a boolean indicating if the value is scalar
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impl<T> Debug for Scalar<T>
where T: Debug + Array,

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

Formats the value using the given formatter. Read more
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impl<T> Copy for Scalar<T>
where T: Copy + Array,

Auto Trait Implementations§

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impl<T> Freeze for Scalar<T>
where T: Freeze,

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impl<T> RefUnwindSafe for Scalar<T>
where T: RefUnwindSafe,

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impl<T> Send for Scalar<T>

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impl<T> Sync for Scalar<T>

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impl<T> Unpin for Scalar<T>
where T: Unpin,

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impl<T> UnwindSafe for Scalar<T>
where T: UnwindSafe,

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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> CloneToUninit for T
where T: Clone,

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default 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
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impl<T> CloneToUninit for T
where T: Copy,

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

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,