Trait Array 

pub trait Array:
    Send
    + Sync
    + DynClone
    + 'static {
    // Required methods
    fn as_any(&self) -> &dyn Any;
    fn as_any_mut(&mut self) -> &mut dyn Any;
    fn len(&self) -> usize;
    fn dtype(&self) -> &ArrowDataType;
    fn dtype_mut(&mut self) -> &mut ArrowDataType;
    fn validity(&self) -> Option<&Bitmap>;
    fn split_at_boxed(&self, offset: usize) -> (Box<dyn Array>, Box<dyn Array>);
    unsafe fn split_at_boxed_unchecked(
        &self,
        offset: usize,
    ) -> (Box<dyn Array>, Box<dyn Array>);
    fn slice(&mut self, offset: usize, length: usize);
    unsafe fn slice_unchecked(&mut self, offset: usize, length: usize);
    fn with_validity(&self, validity: Option<Bitmap>) -> Box<dyn Array>;
    fn to_boxed(&self) -> Box<dyn Array>;

    // Provided methods
    fn is_empty(&self) -> bool { ... }
    fn null_count(&self) -> usize { ... }
    fn has_nulls(&self) -> bool { ... }
    fn is_null(&self, i: usize) -> bool { ... }
    unsafe fn is_null_unchecked(&self, i: usize) -> bool { ... }
    fn is_valid(&self, i: usize) -> bool { ... }
    fn sliced(&self, offset: usize, length: usize) -> Box<dyn Array> { ... }
    unsafe fn sliced_unchecked(
        &self,
        offset: usize,
        length: usize,
    ) -> Box<dyn Array> { ... }
}

A trait representing an immutable Arrow array. Arrow arrays are trait objects that are infallibly downcast to concrete types according to the Array::dtype.

Required Methods

fn as_any(&self) -> &dyn Any

Converts itself to a reference of Any, which enables downcasting to concrete types.

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

Converts itself to a mutable reference of Any, which enables mutable downcasting to concrete types.

fn len(&self) -> usize

The length of the Array. Every array has a length corresponding to the number of elements (slots).

fn dtype(&self) -> &ArrowDataType

The ArrowDataType of the Array. In combination with Array::as_any, this can be used to downcast trait objects (dyn Array) to concrete arrays.

fn dtype_mut(&mut self) -> &mut ArrowDataType

fn validity(&self) -> Option<&Bitmap>

The validity of the Array: every array has an optional Bitmap that, when available specifies whether the array slot is valid or not (null). When the validity is None, all slots are valid.

fn split_at_boxed(&self, offset: usize) -> (Box<dyn Array>, Box<dyn Array>)

Split Self at offset into two boxed Arrays where offset <= self.len().

unsafe fn split_at_boxed_unchecked( &self, offset: usize, ) -> (Box<dyn Array>, Box<dyn Array>)

Split Self at offset into two boxed Arrays without checking offset <= self.len().

Safety

Safe if offset <= self.len().

fn slice(&mut self, offset: usize, length: usize)

Slices this Array.

Implementation

This operation is O(1) over len.

Panic

This function panics iff offset + length > self.len().

unsafe fn slice_unchecked(&mut self, offset: usize, length: usize)

Slices the Array.

Implementation

This operation is O(1).

Safety

The caller must ensure that offset + length <= self.len()

fn with_validity(&self, validity: Option<Bitmap>) -> Box<dyn Array>

Clones this Array with a new assigned bitmap.

Panic

This function panics iff validity.len() != self.len().

fn to_boxed(&self) -> Box<dyn Array>

Clone a &dyn Array to an owned Box<dyn Array>.

Provided Methods

fn is_empty(&self) -> bool

whether the array is empty

fn null_count(&self) -> usize

The number of null slots on this Array.

Implementation

This is O(1) since the number of null elements is pre-computed.

fn has_nulls(&self) -> bool

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

Returns whether slot i is null.

Panic

Panics iff i >= self.len().

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

Returns whether slot i is null.

Safety

The caller must ensure i < self.len()

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

Returns whether slot i is valid.

Panic

Panics iff i >= self.len().

fn sliced(&self, offset: usize, length: usize) -> Box<dyn Array>

Returns a slice of this Array.

Implementation

This operation is O(1) over len.

Panic

This function panics iff offset + length > self.len().

unsafe fn sliced_unchecked( &self, offset: usize, length: usize, ) -> Box<dyn Array>

Returns a slice of this Array.

Implementation

This operation is O(1) over len, as it amounts to increase two ref counts and moving the struct to the heap.

Safety

The caller must ensure that offset + length <= self.len()

Trait Implementations

impl<'a> AsRef<dyn Array + 'a> for dyn Array

fn as_ref(&self) -> &(dyn Array + 'a)

Converts this type into a shared reference of the (usually inferred) input type.

impl Debug for dyn Array + '_

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

Formats the value using the given formatter.

impl IntoBoxedArray for Box<dyn Array>

fn into_boxed(self) -> Box<dyn Array>

impl PartialEq for dyn Array + '_

fn eq(&self, that: &dyn Array) -> 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.

impl<O: Offset> PartialEq<&(dyn Array + 'static)> for BinaryArray<O>

fn eq(&self, other: &&dyn Array) -> 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.

impl PartialEq<&(dyn Array + 'static)> for BooleanArray

fn eq(&self, other: &&dyn Array) -> 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.

impl<K: DictionaryKey> PartialEq<&(dyn Array + 'static)> for DictionaryArray<K>

fn eq(&self, other: &&dyn Array) -> 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.

impl PartialEq<&(dyn Array + 'static)> for FixedSizeBinaryArray

fn eq(&self, other: &&dyn Array) -> 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.

impl PartialEq<&(dyn Array + 'static)> for FixedSizeListArray

fn eq(&self, other: &&dyn Array) -> 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.

impl<O: Offset> PartialEq<&(dyn Array + 'static)> for ListArray<O>

fn eq(&self, other: &&dyn Array) -> 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.

impl PartialEq<&(dyn Array + 'static)> for MapArray

fn eq(&self, other: &&dyn Array) -> 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.

impl PartialEq<&(dyn Array + 'static)> for NullArray

fn eq(&self, other: &&dyn Array) -> 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.

impl<T: NativeType> PartialEq<&(dyn Array + 'static)> for PrimitiveArray<T>

fn eq(&self, other: &&dyn Array) -> 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.

impl PartialEq<&(dyn Array + 'static)> for StructArray

fn eq(&self, other: &&dyn Array) -> 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.

impl PartialEq<&(dyn Array + 'static)> for UnionArray

fn eq(&self, other: &&dyn Array) -> 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.

impl<O: Offset> PartialEq<&(dyn Array + 'static)> for Utf8Array<O>

fn eq(&self, other: &&dyn Array) -> 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.

impl<O: Offset> PartialEq<BinaryArray<O>> for &dyn Array

fn eq(&self, other: &BinaryArray<O>) -> 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.

impl<T: NativeType> PartialEq<PrimitiveArray<T>> for &dyn Array

fn eq(&self, other: &PrimitiveArray<T>) -> 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.

impl<O: Offset> PartialEq<Utf8Array<O>> for &dyn Array

fn eq(&self, other: &Utf8Array<O>) -> 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.

impl PartialEq<dyn Array> for Arc<dyn Array + '_>

fn eq(&self, that: &dyn Array) -> 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.

impl PartialEq<dyn Array> for Box<dyn Array + '_>

fn eq(&self, that: &dyn Array) -> 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.

impl TotalEq for Box<dyn Array>

fn tot_eq(&self, other: &Self) -> bool

fn tot_ne(&self, other: &Self) -> bool

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Array for BooleanArray

impl Array for FixedSizeBinaryArray

impl Array for FixedSizeListArray

impl Array for MapArray

impl Array for NullArray

impl Array for StructArray

impl Array for UnionArray

impl<K: DictionaryKey> Array for DictionaryArray<K>

impl<O: Offset> Array for BinaryArray<O>

impl<O: Offset> Array for ListArray<O>

impl<O: Offset> Array for Utf8Array<O>

impl<T: NativeType> Array for PrimitiveArray<T>

impl<T: ViewType + ?Sized> Array for BinaryViewArrayGeneric<T>