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§

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Array(ArrayRef)

Array of values

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Scalar(ScalarValue)

A single value

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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.

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pub fn create_null_array(num_rows: usize) -> Self

null columnar values are implemented as a null array in order to pass batch num_rows

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§

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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<U> for Twhere 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 Twhere 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 Twhere 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 Twhere 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.