Struct BooleanArray

pub struct BooleanArray {
    values: BooleanBuffer,
    nulls: Option<NullBuffer>,
}

Expand description

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)])

Fields§

§values: BooleanBuffer§nulls: Option<NullBuffer>

Implementations§

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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.

Note: This method does not check for nulls and the value is arbitrary if is_null returns true for the index.

§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.

Note: This method does not check for nulls and the value is arbitrary if is_null returns true for the index.

§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

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impl<'a> BooleanArray

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

constructs a new iterator

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impl BooleanArray

pub unsafe fn from_trusted_len_iter<I, P>(iter: I) -> BooleanArray
where P: Into<BooleanAdapter>, I: ExactSizeIterator<Item = P>,

Creates a BooleanArray from an iterator of trusted length.

§Safety

The iterator must be TrustedLen. I.e. that size_hint().1 correctly reports its length. Note that this is a stronger guarantee that ExactSizeIterator provides which could still report a wrong length.

§Panics

Panics if the iterator does not report an upper bound on size_hint().

Trait Implementations§

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impl Array for BooleanArray

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

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

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fn to_data(&self) -> ArrayData

Returns the underlying data of this array

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fn into_data(self) -> ArrayData

Returns the underlying data of this array Read more

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fn data_type(&self) -> &DataType

Returns a reference to the DataType of this array. Read more

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

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

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fn len(&self) -> usize

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

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fn is_empty(&self) -> bool

Returns whether this array is empty. Read more

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fn shrink_to_fit(&mut self)

Shrinks the capacity of any exclusively owned buffer as much as possible Read more

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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. Read more

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

Returns the null buffer of this array if any. Read more

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fn logical_null_count(&self) -> usize

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

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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.

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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.

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