vortex-data / vortex / 16728129466

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feat: implement Cast Kernel with conformance tests (#4086)

⏺ Summary of Changes

The changes implement comprehensive cast conformance testing across the
Vortex array system:

  Core Changes:
- Added a new cast conformance test framework in
vortex-array/src/compute/conformance/cast.rs (541 lines)
- Implemented CastKernel for 17 different array encodings across the
codebase

  Encodings with Cast Support Added:
- Compressed formats: ALP, BitPacking, FOR, FSST, RunEnd, Sparse, ZigZag
- Core types: Bool, Chunked, Constant, Decimal, Extension, List, Null,
Primitive, Struct, VarBin, VarBinView
  - Dictionary encoding: Dict
  - Temporal: DateTime-Parts

  Key Features:
- Each encoding implements optimized casting logic specific to its
format
- Tests cover numeric type conversions (widening/narrowing), nullability
changes, string conversions, and edge cases
- Many encodings can perform casts without full decompression when
possible (e.g., ZigZag preserves encoding for nullability-only changes)

The implementation ensures type safety and performance across Vortex's
compressed array formats while maintaining data integrity during type
conversions.

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Signed-off-by: Will Manning <will@willmanning.io>

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