Enum datafusion_expr::ColumnarValue

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pub enum ColumnarValue {
    Array(ArrayRef),
    Scalar(ScalarValue),
}

Expand description

Represents the result of evaluating an expression: either a single ScalarValue or an ArrayRef.

While a ColumnarValue can always be converted into an array for convenience, it is often much more performant to provide an optimized path for scalar values.

Variants

`Array(ArrayRef)`

Array of values

`Scalar(ScalarValue)`

A single value

Implementations

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impl ColumnarValue

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pub fn data_type(&self) -> DataType

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pub fn into_array(self, num_rows: usize) -> ArrayRef

Convert a columnar value into an ArrayRef. Self::Scalar is converted by repeating the same scalar multiple times.

Trait Implementations

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impl Clone for ColumnarValue

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fn clone(&self) -> ColumnarValue

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 Debug for ColumnarValue

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

Formats the value using the given formatter. Read more

Auto Trait Implementations

impl !RefUnwindSafe for ColumnarValue

impl Send for ColumnarValue

impl Sync for ColumnarValue

impl Unpin for ColumnarValue

impl !UnwindSafe for ColumnarValue

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,

const: unstable · source

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,

const: unstable · source

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

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source

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,

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 for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

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

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

Enum datafusion_expr::ColumnarValue

Variants

Array(ArrayRef)

Scalar(ScalarValue)

Implementations

impl ColumnarValue

pub fn data_type(&self) -> DataType

pub fn into_array(self, num_rows: usize) -> ArrayRef

Trait Implementations

impl Clone for ColumnarValue

fn clone(&self) -> ColumnarValue

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

impl Debug for ColumnarValue

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

Auto Trait Implementations

impl !RefUnwindSafe for ColumnarValue

impl Send for ColumnarValue

impl Sync for ColumnarValue

impl Unpin for ColumnarValue

impl !UnwindSafe for ColumnarValue

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

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

type Owned = T

fn to_owned(&self) -> T

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

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

type Error = Infallible

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

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

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

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

`Array(ArrayRef)`

`Scalar(ScalarValue)`

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

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

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

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

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

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

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