Struct arrow::array::PrimitiveRunBuilder

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pub struct PrimitiveRunBuilder<R, V>{ /* private fields */ }
Expand description

Builder for RunArray of PrimitiveArray

§Example:



let mut builder =
PrimitiveRunBuilder::<Int16Type, UInt32Type>::new();
builder.append_value(1234);
builder.append_value(1234);
builder.append_value(1234);
builder.append_null();
builder.append_value(5678);
builder.append_value(5678);
let array = builder.finish();

assert_eq!(array.run_ends().values(), &[3, 4, 6]);

let av = array.values();

assert!(!av.is_null(0));
assert!(av.is_null(1));
assert!(!av.is_null(2));

// Values are polymorphic and so require a downcast.
let ava: &UInt32Array = av.as_primitive::<UInt32Type>();

assert_eq!(ava, &UInt32Array::from(vec![Some(1234), None, Some(5678)]));

Implementations§

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impl<R, V> PrimitiveRunBuilder<R, V>

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pub fn new() -> PrimitiveRunBuilder<R, V>

Creates a new PrimitiveRunBuilder

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pub fn with_capacity(capacity: usize) -> PrimitiveRunBuilder<R, V>

Creates a new PrimitiveRunBuilder with the provided capacity

capacity: the expected number of run-end encoded values.

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impl<R, V> PrimitiveRunBuilder<R, V>

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pub fn append_option( &mut self, value: Option<<V as ArrowPrimitiveType>::Native>, )

Appends optional value to the logical array encoded by the RunArray.

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pub fn append_value(&mut self, value: <V as ArrowPrimitiveType>::Native)

Appends value to the logical array encoded by the run-ends array.

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pub fn append_null(&mut self)

Appends null to the logical array encoded by the run-ends array.

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pub fn finish(&mut self) -> RunArray<R>

Creates the RunArray and resets the builder. Panics if RunArray cannot be built.

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pub fn finish_cloned(&self) -> RunArray<R>

Creates the RunArray and without resetting the builder. Panics if RunArray cannot be built.

Trait Implementations§

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impl<R, V> ArrayBuilder for PrimitiveRunBuilder<R, V>

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fn as_any(&self) -> &(dyn Any + 'static)

Returns the builder as a non-mutable Any reference.

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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Returns the builder as a mutable Any reference.

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fn into_box_any(self: Box<PrimitiveRunBuilder<R, V>>) -> Box<dyn Any>

Returns the boxed builder as a box of Any.

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fn len(&self) -> usize

Returns the length of logical array encoded by the eventual runs array.

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fn finish(&mut self) -> Arc<dyn Array>

Builds the array and reset this builder.

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fn finish_cloned(&self) -> Arc<dyn Array>

Builds the array without resetting the builder.

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fn is_empty(&self) -> bool

Returns whether number of array slots is zero
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impl<R, V> Debug for PrimitiveRunBuilder<R, V>

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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<R, V> Default for PrimitiveRunBuilder<R, V>

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fn default() -> PrimitiveRunBuilder<R, V>

Returns the “default value” for a type. Read more
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impl<R, V> Extend<Option<<V as ArrowPrimitiveType>::Native>> for PrimitiveRunBuilder<R, V>

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fn extend<T>(&mut self, iter: T)
where T: IntoIterator<Item = Option<<V as ArrowPrimitiveType>::Native>>,

Extends a collection with the contents of an iterator. Read more
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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more

Auto Trait Implementations§

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<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, 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,