jhorstmann opened a new pull request #1494:
URL: https://github.com/apache/arrow-rs/pull/1494
# Which issue does this PR close?
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(will create a ticket if this useful to more people)
# Rationale for this change
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I'd like to process data that is coming from outside arrow using arrow
compute kernels without copying the data.
The FFI api does not seem to support this use case at the moment. The only
way I found to create an `FFI_ArrowArray` was with an already existing
`ArrayData` struct. Creating `ArrayData` requires at least one `Buffer`, and
creating a `Buffer` from foreign memory again needs an `FFI_ArrowArray`.
# What changes are included in this PR?
The owner of an allocation is tracked via a trait object instead of an
`FFI_ArrowArray`. This allows zero-copy interoperability between arrow buffers
and most collection types from rust stdlib or other crates. The most common
example would be `Vec` or `String`, and it should also be possible to access
arrow2 buffers this way.
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# Are there any user-facing changes?
The function `from_unowned` was renamed to `from_foreign`, which is a
breaking change. We could also keep the old name and introduce a new function.
The "unowned" part sounds misleading to me though since the data is owned by
the `FFI_ArrayArray`.
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