sunchao commented on a change in pull request #1449:
URL: https://github.com/apache/arrow-rs/pull/1449#discussion_r830366722
##########
File path: arrow/src/array/array.rs
##########
@@ -632,6 +632,40 @@ pub unsafe fn make_array_from_raw(
let data = ArrayData::try_from(array)?;
Ok(make_array(data))
}
+
+/// Exports an array to raw pointers of the C Data Interface provided by the
consumer.
+/// # Safety
+/// Assumes that these pointers represent valid C Data Interfaces, both in
memory
+/// representation and lifetime via the `release` mechanism.
+///
+/// This function copies the content of two FFI structs [ffi::FFI_ArrowArray]
and
+/// [ffi::FFI_ArrowSchema] in the array to the location pointed by the raw
pointers.
+/// Usually the raw pointers are provided by the array data consumer.
+pub unsafe fn export_array_into_raw(
+ src: ArrayRef,
+ out_array: *mut ffi::FFI_ArrowArray,
+ out_schema: *mut ffi::FFI_ArrowSchema,
+) -> Result<()> {
+ let (array, schema) = src.to_raw()?;
Review comment:
hmm can we just construct array and schema explicitly?
```rust
let data = src.data().clone();
let array = FFI_ArrowArray::new(&data);
let schema = FFI_ArrowSchema::try_from(data.data_type())?;
std::ptr::write_unaligned(out_array, array);
std::ptr::write_unaligned(out_schema, schema);
Ok(())
```
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