Struct arrow::array::BooleanArray

pub struct BooleanArray { /* private fields */ }

An array of boolean values

Example: From a Vec

let arr: BooleanArray = vec![true, true, false].into();

Example: From an optional Vec

let arr: BooleanArray = vec![Some(true), None, Some(false)].into();

Example: From an iterator

let arr: BooleanArray = (0..5).map(|x| (x % 2 == 0).then(|| x % 3 == 0)).collect();
let values: Vec<_> = arr.iter().collect();
assert_eq!(&values, &[Some(true), None, Some(false), None, Some(false)])

Example: Using Builder

let mut builder = BooleanBuilder::new();
builder.append_value(true);
builder.append_null();
builder.append_value(false);
let array = builder.finish();
let values: Vec<_> = array.iter().collect();
assert_eq!(&values, &[Some(true), None, Some(false)])

Implementations

impl BooleanArray

pub fn new(values: BooleanBuffer, nulls: Option<NullBuffer>) -> BooleanArray

Create a new BooleanArray from the provided values and nulls

Panics

Panics if values.len() != nulls.len()

pub fn new_null(len: usize) -> BooleanArray

Create a new BooleanArray with length len consisting only of nulls

pub fn new_scalar(value: bool) -> Scalar<BooleanArray>

Create a new Scalar from value

pub fn new_from_packed( buffer: impl Into<Buffer>, offset: usize, len: usize, ) -> BooleanArray

Create a new BooleanArray from a Buffer specified by offset and len, the offset and len in bits Logically convert each bit in Buffer to boolean and use it to build BooleanArray. using this method will make the following points self-evident:

• there is no null in the constructed BooleanArray;
• without considering buffer.into(), this method is efficient because there is no need to perform pack and unpack operations on boolean;

pub fn new_from_u8(value: &[u8]) -> BooleanArray

Create a new BooleanArray from &[u8] This method uses new_from_packed and constructs a Buffer using value, and offset is set to 0 and len is set to value.len() * 8 using this method will make the following points self-evident:

• there is no null in the constructed BooleanArray;
• the length of the constructed BooleanArray is always a multiple of 8;

pub fn len(&self) -> usize

Returns the length of this array.

pub fn is_empty(&self) -> bool

Returns whether this array is empty.

pub fn slice(&self, offset: usize, length: usize) -> BooleanArray

Returns a zero-copy slice of this array with the indicated offset and length.

pub fn builder(capacity: usize) -> BooleanBuilder

Returns a new boolean array builder

pub fn values(&self) -> &BooleanBuffer

Returns the underlying BooleanBuffer holding all the values of this array

pub fn true_count(&self) -> usize

Returns the number of non null, true values within this array

pub fn false_count(&self) -> usize

Returns the number of non null, false values within this array

pub unsafe fn value_unchecked(&self, i: usize) -> bool

Returns the boolean value at index i.

Safety

This doesn’t check bounds, the caller must ensure that index < self.len()

pub fn value(&self, i: usize) -> bool

Returns the boolean value at index i.

Panics

Panics if index i is out of bounds

pub fn take_iter<'a>( &'a self, indexes: impl Iterator<Item = Option<usize>> + 'a, ) -> impl Iterator<Item = Option<bool>> + 'a

Returns an iterator that returns the values of array.value(i) for an iterator with each element i

pub unsafe fn take_iter_unchecked<'a>( &'a self, indexes: impl Iterator<Item = Option<usize>> + 'a, ) -> impl Iterator<Item = Option<bool>> + 'a

Returns an iterator that returns the values of array.value(i) for an iterator with each element i

Safety

caller must ensure that the offsets in the iterator are less than the array len()

pub fn from_unary<T, F>(left: T, op: F) -> BooleanArray

where T: ArrayAccessor, F: FnMut(<T as ArrayAccessor>::Item) -> bool,

Create a BooleanArray by evaluating the operation for each element of the provided array

let array = Int32Array::from(vec![1, 2, 3, 4, 5]);
let r = BooleanArray::from_unary(&array, |x| x > 2);
assert_eq!(&r, &BooleanArray::from(vec![false, false, true, true, true]));

pub fn from_binary<T, S, F>(left: T, right: S, op: F) -> BooleanArray

where T: ArrayAccessor, S: ArrayAccessor, F: FnMut(<T as ArrayAccessor>::Item, <S as ArrayAccessor>::Item) -> bool,

Create a BooleanArray by evaluating the binary operation for each element of the provided arrays

let a = Int32Array::from(vec![1, 2, 3, 4, 5]);
let b = Int32Array::from(vec![1, 2, 0, 2, 5]);
let r = BooleanArray::from_binary(&a, &b, |a, b| a == b);
assert_eq!(&r, &BooleanArray::from(vec![true, true, false, false, true]));

Panics

This function panics if left and right are not the same length

pub fn into_parts(self) -> (BooleanBuffer, Option<NullBuffer>)

Deconstruct this array into its constituent parts

impl<'a> BooleanArray

pub fn iter(&'a self) -> ArrayIter<&'a BooleanArray>

constructs a new iterator

Trait Implementations

impl Array for BooleanArray

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

Returns the array as Any so that it can be downcasted to a specific implementation.

fn to_data(&self) -> ArrayData

Returns the underlying data of this array

fn into_data(self) -> ArrayData

Returns the underlying data of this array

fn data_type(&self) -> &DataType

Returns a reference to the DataType of this array.

fn slice(&self, offset: usize, length: usize) -> Arc<dyn Array>

Returns a zero-copy slice of this array with the indicated offset and length.

fn len(&self) -> usize

Returns the length (i.e., number of elements) of this array.

fn is_empty(&self) -> bool

Returns whether this array is empty.

fn offset(&self) -> usize

Returns the offset into the underlying data used by this array(-slice). Note that the underlying data can be shared by many arrays. This defaults to 0.

fn nulls(&self) -> Option<&NullBuffer>

Returns the null buffer of this array if any.

fn logical_null_count(&self) -> usize

Returns the total number of logical null values in this array.

fn get_buffer_memory_size(&self) -> usize

Returns the total number of bytes of memory pointed to by this array. The buffers store bytes in the Arrow memory format, and include the data as well as the validity map. Note that this does not always correspond to the exact memory usage of an array, since multiple arrays can share the same buffers or slices thereof.

fn get_array_memory_size(&self) -> usize

Returns the total number of bytes of memory occupied physically by this array. This value will always be greater than returned by get_buffer_memory_size() and includes the overhead of the data structures that contain the pointers to the various buffers.

fn logical_nulls(&self) -> Option<NullBuffer>

Returns a potentially computed NullBuffer that represents the logical null values of this array, if any.

fn is_null(&self, index: usize) -> bool

Returns whether the element at index is null according to Array::nulls

fn is_valid(&self, index: usize) -> bool

Returns whether the element at index is not null, the opposite of Self::is_null.

fn null_count(&self) -> usize

Returns the total number of physical null values in this array.

fn is_nullable(&self) -> bool

Returns false if the array is guaranteed to not contain any logical nulls

impl ArrayAccessor for &BooleanArray

type Item = bool

The Arrow type of the element being accessed.

fn value(&self, index: usize) -> <&BooleanArray as ArrayAccessor>::Item

Returns the element at index i

unsafe fn value_unchecked( &self, index: usize, ) -> <&BooleanArray as ArrayAccessor>::Item

Returns the element at index i

impl Clone for BooleanArray

fn clone(&self) -> BooleanArray

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for BooleanArray

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

Formats the value using the given formatter.

impl From<ArrayData> for BooleanArray

fn from(data: ArrayData) -> BooleanArray

Converts to this type from the input type.

impl From<BooleanArray> for ArrayData

fn from(array: BooleanArray) -> ArrayData

Converts to this type from the input type.

impl From<BooleanBuffer> for BooleanArray

fn from(values: BooleanBuffer) -> BooleanArray

Converts to this type from the input type.

impl From<Vec<Option<bool>>> for BooleanArray

fn from(data: Vec<Option<bool>>) -> BooleanArray

Converts to this type from the input type.

impl From<Vec<bool>> for BooleanArray

fn from(data: Vec<bool>) -> BooleanArray

Converts to this type from the input type.

impl<Ptr> FromIterator<Ptr> for BooleanArray

where Ptr: Borrow<Option<bool>>,

fn from_iter<I>(iter: I) -> BooleanArray

where I: IntoIterator<Item = Ptr>,

Creates a value from an iterator.

impl<'a> IntoIterator for &'a BooleanArray

type Item = Option<bool>

The type of the elements being iterated over.

type IntoIter = ArrayIter<&'a BooleanArray>

Which kind of iterator are we turning this into?

fn into_iter(self) -> <&'a BooleanArray as IntoIterator>::IntoIter

Creates an iterator from a value.

impl PartialEq for BooleanArray

fn eq(&self, other: &BooleanArray) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.