Struct arrow::array::NullBuilder

pub struct NullBuilder { /* private fields */ }

Builder for NullArray

Example

Create a NullArray from a NullBuilder

let mut b = NullBuilder::new();
b.append_empty_value();
b.append_null();
b.append_nulls(3);
b.append_empty_values(3);
let arr = b.finish();

assert_eq!(8, arr.len());
assert_eq!(0, arr.null_count());

Implementations

impl NullBuilder

pub fn new() -> NullBuilder

Creates a new null builder

pub fn with_capacity(_capacity: usize) -> NullBuilder

👎Deprecated: there is no actual notion of capacity in the NullBuilder, so emulating it makes little sense

Creates a new null builder with space for capacity elements without re-allocating

pub fn capacity(&self) -> usize

👎Deprecated: there is no actual notion of capacity in the NullBuilder, so emulating it makes little sense

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

pub fn append_null(&mut self)

Appends a null slot into the builder

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

Appends n nulls into the builder.

pub fn append_empty_value(&mut self)

Appends a null slot into the builder

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

Appends n nulls into the builder.

pub fn finish(&mut self) -> NullArray

Builds the NullArray and reset this builder.

pub fn finish_cloned(&self) -> NullArray

Builds the NullArray without resetting the builder.

Trait Implementations

impl ArrayBuilder for NullBuilder

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

Returns the builder as a non-mutable Any reference.

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

Returns the builder as a mutable Any reference.

fn into_box_any(self: Box<NullBuilder>) -> 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 finish(&mut self) -> Arc<dyn Array>

Builds the array and reset this builder.

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

Builds the array without resetting the builder.

fn is_empty(&self) -> bool

Returns whether number of array slots is zero

impl Debug for NullBuilder

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

Formats the value using the given formatter.

impl Default for NullBuilder

fn default() -> NullBuilder

Returns the “default value” for a type.