zeroshade opened a new pull request, #39770:
URL: https://github.com/apache/arrow/pull/39770
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### Rationale for this change
In my testing with libcudf and other GPU data, I discovered a deficiency in
ImportDeviceArray and thus ImportDeviceRecordBatch where the device type and
memory manager aren't propagated to child importers and it fails to import
offset-based types such as strings.
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### What changes are included in this PR?
These are relatively easily handled by first ensuring that `ImportChild`
propagates the device_type and memory manager from the parent. Then for
importing offset based values we merely need to use the memory manager to copy
the final offset value to the CPU to use for the buffer size computation.
This will work for any device which has implemented CopyBufferTo/From
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### Are these changes tested?
A new test is added to test these situations.
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