Draft: SelectionSpan + 64-bit selection indices#72
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Introduce SelectionSpan (ContiguousSpan / FilteredSpan / DiscreteSpan) for the scalar kernel selective_exec API. Currently ExecSpanIterator only emits DiscreteSpan, but VisitSelectionSpanInline allows kernels and tests to handle additional shapes incrementally. Also cast SelectionVector indices to int64 in the dense gather/execute/scatter fallback since Scatter requires signed indices.
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Thanks for opening a pull request! If this is not a minor PR. Could you open an issue for this pull request on GitHub? https://github.com/apache/arrow/issues/new/choose Opening GitHub issues ahead of time contributes to the Openness of the Apache Arrow project. Then could you also rename the pull request title in the following format? or See also: |
Remove SelectionVectorSpan, use DiscreteSpan directly, emit ContiguousSpan for contiguous selections, and simplify VisitSelectionSpanInline with overload visitors.
- Hide selection backend behind PIMPL (indices/mask/ranges) - Use backend-specific gather/scatter for selective dense fallback - Normalize preallocation state + fix tests
This reverts commit 9a9fbf1.
- Deduplicate ApplySelectionMask for ArrayData/ArraySpan\n- Fix OUTPUT_NOT_NULL full-span validity init\n- Add unit test for OUTPUT_NOT_NULL selective exec
- Centralize SelectedCount/empty-span checks\n- Reduce scattered selection if/else in ScalarExecutor
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Addresses pitrou review feedback on apache#47377:
Local verification (macOS arm64, Debug):
PYTHON=python3ARROW_TEST_DATA=$PWD/testing/data(requiresgit submodule update --init testing)ctest --test-dir cpp/build/selspan-debug -j 8 --output-on-failure(50/50 passed)