Struct Constant 

pub struct Constant;

Implementations

impl Constant

pub const TAKE_RULES: ParentRuleSet<Self>

impl Constant

pub const ID: ArrayId

Trait Implementations

impl BetweenReduce for Constant

fn between( array: &ConstantArray, lower: &ArrayRef, upper: &ArrayRef, options: &BetweenOptions, ) -> VortexResult<Option<ArrayRef>>

impl CastReduce for Constant

fn cast(array: &ConstantArray, dtype: &DType) -> VortexResult<Option<ArrayRef>>

impl Debug for Constant

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

Formats the value using the given formatter.

impl FillNullReduce for Constant

fn fill_null( array: &ConstantArray, fill_value: &Scalar, ) -> VortexResult<Option<ArrayRef>>

impl FilterReduce for Constant

fn filter(array: &ConstantArray, mask: &Mask) -> VortexResult<Option<ArrayRef>>

Filter an array with the provided mask without reading buffers.

impl MinMaxKernel for Constant

fn min_max(&self, array: &ConstantArray) -> VortexResult<Option<MinMaxResult>>

impl NotReduce for Constant

fn invert(array: &ConstantArray) -> VortexResult<Option<ArrayRef>>

impl OperationsVTable<Constant> for Constant

fn scalar_at(array: &ConstantArray, _index: usize) -> VortexResult<Scalar>

Fetch the scalar at the given index.

impl SliceReduce for Constant

fn slice( array: &Self::Array, range: Range<usize>, ) -> VortexResult<Option<ArrayRef>>

Slice an array with the provided range without reading buffers.

impl SumKernel for Constant

fn sum( &self, array: &ConstantArray, accumulator: &Scalar, ) -> VortexResult<Scalar>

Preconditions

impl TakeReduce for Constant

fn take( array: &ConstantArray, indices: &ArrayRef, ) -> VortexResult<Option<ArrayRef>>

Take elements from an array at the given indices without reading buffers.

impl VTable for Constant

type Array = ConstantArray

type Metadata = Scalar

type OperationsVTable = Constant

type ValidityVTable = Constant

fn id(_array: &Self::Array) -> ArrayId

Returns the ID of the array.

fn len(array: &ConstantArray) -> usize

Returns the length of the array.

fn dtype(array: &ConstantArray) -> &DType

Returns the DType of the array.

fn stats(array: &ConstantArray) -> StatsSetRef<'_>

Returns the stats set for the array.

fn array_hash<H: Hasher>( array: &ConstantArray, state: &mut H, _precision: Precision, )

Hashes the array contents.

fn array_eq( array: &ConstantArray, other: &ConstantArray, _precision: Precision, ) -> bool

Compares two arrays of the same type for equality.

fn nbuffers(_array: &ConstantArray) -> usize

Returns the number of buffers in the array.

fn buffer(array: &ConstantArray, idx: usize) -> BufferHandle

Returns the buffer at the given index.

fn buffer_name(_array: &ConstantArray, idx: usize) -> Option<String>

Returns the name of the buffer at the given index, or None if unnamed.

fn nchildren(_array: &ConstantArray) -> usize

Returns the number of children in the array.

fn child(_array: &ConstantArray, idx: usize) -> ArrayRef

Returns the child at the given index.

fn child_name(_array: &ConstantArray, idx: usize) -> String

Returns the name of the child at the given index.

fn metadata(array: &ConstantArray) -> VortexResult<Self::Metadata>

Exports metadata for an array.

fn serialize(_metadata: Self::Metadata) -> VortexResult<Option<Vec<u8>>>

Serialize metadata into a byte buffer for IPC or file storage. Return None if the array cannot be serialized.

fn deserialize( _bytes: &[u8], dtype: &DType, _len: usize, buffers: &[BufferHandle], session: &VortexSession, ) -> VortexResult<Self::Metadata>

Deserialize array metadata from a byte buffer.

fn build( _dtype: &DType, len: usize, metadata: &Self::Metadata, _buffers: &[BufferHandle], _children: &dyn ArrayChildren, ) -> VortexResult<ConstantArray>

Build an array from components.

fn with_children( _array: &mut Self::Array, children: Vec<ArrayRef>, ) -> VortexResult<()>

Replaces the children in array with children. The count must be the same and types of children must be expected.

fn reduce_parent( array: &Self::Array, parent: &ArrayRef, child_idx: usize, ) -> VortexResult<Option<ArrayRef>>

Attempt to perform a reduction of the parent of this array.

fn execute( array: &Self::Array, _ctx: &mut ExecutionCtx, ) -> VortexResult<ExecutionStep>

Execute this array by returning an ExecutionStep that tells the scheduler what to do next.

fn append_to_builder( array: &ConstantArray, builder: &mut dyn ArrayBuilder, ctx: &mut ExecutionCtx, ) -> VortexResult<()>

Writes the array into a canonical builder.

fn execute_parent( array: &Self::Array, parent: &ArrayRef, child_idx: usize, ctx: &mut ExecutionCtx, ) -> VortexResult<Option<ArrayRef>>

Attempt to execute the parent of this array.

fn reduce(array: &Self::Array) -> VortexResult<Option<ArrayRef>>

Attempt to reduce the array to a more simple representation.

impl ValidityVTable<Constant> for Constant

fn validity(array: &ConstantArray) -> VortexResult<Validity>

Returns the Validity of the array.