Trait CastReduce 

pub trait CastReduce: VTable {
    // Required method
    fn cast(
        array: ArrayView<'_, Self>,
        dtype: &DType,
    ) -> VortexResult<Option<ArrayRef>>;
}

Reduce rule for cast: restructure the array without reading buffers.

Encodings implement this to push cast operations through their structure. For example, RunEnd pushes cast down to its values array, ZigZag transforms the target dtype to unsigned and pushes to its encoded array.

Returns Ok(None) if the rule doesn’t apply to this array/dtype combination.

Required Methods

fn cast( array: ArrayView<'_, Self>, dtype: &DType, ) -> VortexResult<Option<ArrayRef>>

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl CastReduce for Bool

impl CastReduce for Chunked

impl CastReduce for Constant

impl CastReduce for Decimal

impl CastReduce for Dict

impl CastReduce for Extension

impl CastReduce for FixedSizeList

Cast implementation for FixedSizeListArray.

Recursively casts the inner elements array to the target element type while preserving the list structure.

impl CastReduce for List

impl CastReduce for ListView

impl CastReduce for Null

impl CastReduce for Primitive

impl CastReduce for Struct

Push the cast into struct fields without execution.

Supports schema evolution by allowing new nullable fields to be added during the cast, filled with null values. For nullability changes, only handles the cheap path (try_cast_nullability); when statistics computation is required to determine whether the array contains invalid values, returns Ok(None) so CastKernel can run instead.

impl CastReduce for VarBin

impl CastReduce for VarBinView