Struct arrow_array::builder::PrimitiveBuilder

pub struct PrimitiveBuilder<T: ArrowPrimitiveType> { /* private fields */ }

Builder for PrimitiveArray

Implementations

impl<T: ArrowPrimitiveType> PrimitiveBuilder<T>

pub fn new() -> Self

Creates a new primitive array builder

pub fn with_capacity(capacity: usize) -> Self

Creates a new primitive array builder with capacity no of items

pub fn new_from_buffer( values_buffer: MutableBuffer, null_buffer: Option<MutableBuffer> ) -> Self

Creates a new primitive array builder from buffers

pub fn with_data_type(self, data_type: DataType) -> Self

By default PrimitiveBuilder uses ArrowPrimitiveType::DATA_TYPE as the data type of the generated array.

This method allows overriding the data type, to allow specifying timezones for DataType::Timestamp or precision and scale for DataType::Decimal128 and DataType::Decimal256

Panics

This method panics if data_type is not PrimitiveArray::is_compatible

pub fn capacity(&self) -> usize

Returns the capacity of this builder measured in slots of type T

pub fn append_value(&mut self, v: T::Native)

Appends a value of type T into the builder

pub fn append_null(&mut self)

Appends a null slot into the builder

pub fn append_nulls(&mut self, n: usize)

Appends n no. of null’s into the builder

pub fn append_option(&mut self, v: Option<T::Native>)

Appends an Option<T> into the builder

pub fn append_slice(&mut self, v: &[T::Native])

Appends a slice of type T into the builder

pub fn append_values(&mut self, values: &[T::Native], is_valid: &[bool])

Appends values from a slice of type T and a validity boolean slice

Panics

Panics if values and is_valid have different lengths

pub unsafe fn append_trusted_len_iter( &mut self, iter: impl IntoIterator<Item = T::Native> )

Appends values from a trusted length iterator.

Safety

This requires the iterator be a trusted length. This could instead require the iterator implement TrustedLen once that is stabilized.

pub fn finish(&mut self) -> PrimitiveArray<T>

Builds the PrimitiveArray and reset this builder.

pub fn finish_cloned(&self) -> PrimitiveArray<T>

Builds the PrimitiveArray without resetting the builder.

pub fn values_slice(&self) -> &[T::Native]

Returns the current values buffer as a slice

pub fn values_slice_mut(&mut self) -> &mut [T::Native]

Returns the current values buffer as a mutable slice

pub fn validity_slice(&self) -> Option<&[u8]>

Returns the current null buffer as a slice

pub fn validity_slice_mut(&mut self) -> Option<&mut [u8]>

Returns the current null buffer as a mutable slice

pub fn slices_mut(&mut self) -> (&mut [T::Native], Option<&mut [u8]>)

Returns the current values buffer and null buffer as a slice

impl<P: DecimalType> PrimitiveBuilder<P>

pub fn with_precision_and_scale( self, precision: u8, scale: i8 ) -> Result<Self, ArrowError>

Sets the precision and scale

impl<P: ArrowTimestampType> PrimitiveBuilder<P>

pub fn with_timezone(self, timezone: impl Into<Arc<str>>) -> Self

Sets the timezone

pub fn with_timezone_opt<S: Into<Arc<str>>>(self, timezone: Option<S>) -> Self

Sets an optional timezone

Trait Implementations

impl<T: ArrowPrimitiveType> ArrayBuilder for PrimitiveBuilder<T>

fn as_any(&self) -> &dyn Any

Returns the builder as a non-mutable Any reference.

fn as_any_mut(&mut self) -> &mut dyn Any

Returns the builder as a mutable Any reference.

fn into_box_any(self: Box<Self>) -> Box<dyn Any>

Returns the boxed builder as a box of Any.

fn len(&self) -> usize

Returns the number of array slots in the builder

fn is_empty(&self) -> bool

Returns whether the number of array slots is zero

fn finish(&mut self) -> ArrayRef

Builds the array and reset this builder.

fn finish_cloned(&self) -> ArrayRef

Builds the array without resetting the builder.

impl<T: Debug + ArrowPrimitiveType> Debug for PrimitiveBuilder<T>where T::Native: Debug,

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

Formats the value using the given formatter.

impl<T: ArrowPrimitiveType> Default for PrimitiveBuilder<T>

fn default() -> Self

Returns the “default value” for a type.

impl<P: ArrowPrimitiveType> Extend<Option<<P as ArrowPrimitiveType>::Native>> for PrimitiveBuilder<P>

fn extend<T: IntoIterator<Item = Option<P::Native>>>(&mut self, iter: T)

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

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.