Struct arrow_array::builder::GenericListBuilder

pub struct GenericListBuilder<OffsetSize: OffsetSizeTrait, T: ArrayBuilder> { /* private fields */ }

Array builder for GenericListArray

Implementations

impl<OffsetSize: OffsetSizeTrait, T: ArrayBuilder> GenericListBuilder<OffsetSize, T>

pub fn new(values_builder: T) -> Self

Creates a new GenericListBuilder from a given values array builder

pub fn with_capacity(values_builder: T, capacity: usize) -> Self

Creates a new GenericListBuilder from a given values array builder capacity is the number of items to pre-allocate space for in this builder

impl<OffsetSize: OffsetSizeTrait, T> GenericListBuilder<OffsetSize, T>where
    T: 'static + ArrayBuilder,

pub fn values(&mut self) -> &mut T

Returns the child array builder as a mutable reference.

This mutable reference can be used to append values into the child array builder, but you must call append to delimit each distinct list value.

pub fn values_ref(&self) -> &T

Returns the child array builder as an immutable reference

pub fn append(&mut self, is_valid: bool)

Finish the current variable-length list array slot

pub fn finish(&mut self) -> GenericListArray<OffsetSize>

Builds the GenericListArray and reset this builder.

pub fn finish_cloned(&self) -> GenericListArray<OffsetSize>

Builds the GenericListArray without resetting the builder.

pub fn offsets_slice(&self) -> &[OffsetSize]

Returns the current offsets buffer as a slice

Trait Implementations

impl<OffsetSize: OffsetSizeTrait, T> ArrayBuilder for GenericListBuilder<OffsetSize, T>where
    T: 'static + ArrayBuilder,

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<OffsetSize: Debug + OffsetSizeTrait, T: Debug + ArrayBuilder> Debug for GenericListBuilder<OffsetSize, T>

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

Formats the value using the given formatter.