GH-43854: [C++] Expose the set of device types where a ChunkedArray is allocated #43853
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And move `enum DeviceAllocationType` to its own lightweight header.
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…rray is allocated (apache#43853) ### Rationale for this change `ChunkedArray`s allow flexible allocation of arrays -- the whole array doesn't have to be allocated in huge contiguous buffers. Nothing today prevents chunked arrays from being made of chunks allocated in different devices and that is good. But we need a way to query the set of devices where a chunked array is allocated at. This PR adds that missing part. ### What changes are included in this PR? Addition of: - the `DeviceAllocationTypeSet` class - `ChunkedArray::device_types()` - `Datum::device_types()` Moved `enum DeviceAllocationType` to the `type_fwd.h` header because `device.h` is too expensive of a header to hold this widely used `enum`. ### Are these changes tested? Added more asserts to `chunked_array_test.cc`. ### Are there any user-facing changes? New APIs. * GitHub Issue: apache#43854 Authored-by: Felipe Oliveira Carvalho <felipekde@gmail.com> Signed-off-by: Felipe Oliveira Carvalho <felipekde@gmail.com>
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Rationale for this change
ChunkedArrays allow flexible allocation of arrays -- the whole array doesn't have to be allocated in huge contiguous buffers. Nothing today prevents chunked arrays from being made of chunks allocated in different devices and that is good. But we need a way to query the set of devices where a chunked array is allocated at. This PR adds that missing part.What changes are included in this PR?
Addition of:
DeviceAllocationTypeSetclassChunkedArray::device_types()Datum::device_types()Moved
enum DeviceAllocationTypeto thetype_fwd.hheader becausedevice.his too expensive of a header to hold this widely usedenum.Are these changes tested?
Added more asserts to
chunked_array_test.cc.Are there any user-facing changes?
New APIs.