wjones127 commented on code in PR #4232:
URL: https://github.com/apache/arrow-rs/pull/4232#discussion_r1201317777
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arrow/src/ffi_stream.rs:
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@@ -231,8 +227,7 @@ impl ExportedArrayStream {
let struct_array = StructArray::from(batch);
let array = FFI_ArrowArray::new(&struct_array.to_data());
- unsafe { std::ptr::copy(addr_of!(array), out, 1) };
- std::mem::forget(array);
+ unsafe { std::ptr::write_unaligned(out, array) };
Review Comment:
This is a good question. However, the docs for `write_unaligned` say that
`src` is guaranteed not to be dropped:
https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
Internally, it's calling `intrinsics::forget()`. So I think this is sound.
https://doc.rust-lang.org/src/core/ptr/mod.rs.html#1447
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