viirya commented on code in PR #4446:
URL: https://github.com/apache/arrow-rs/pull/4446#discussion_r1239011698
##########
arrow-buffer/src/buffer/scalar.rs:
##########
@@ -118,11 +119,16 @@ impl<T: ArrowNativeType> From<MutableBuffer> for
ScalarBuffer<T> {
impl<T: ArrowNativeType> From<Buffer> for ScalarBuffer<T> {
fn from(buffer: Buffer) -> Self {
let align = std::mem::align_of::<T>();
- assert_eq!(
- buffer.as_ptr().align_offset(align),
- 0,
- "memory is not aligned"
- );
+ let is_aligned = buffer.as_ptr().align_offset(align) == 0;
+
+ match buffer.deallocation() {
+ Deallocation::Standard(_) => assert!(
+ is_aligned,
+ "Memory pointer is not aligned with the specified scalar type."
+ ),
+ Deallocation::Custom(_) =>
+ assert!(is_aligned, "Memory pointer from external source (e.g,
FFI) is not aligned with the specified scalar type. Before importing buffer
through FFI, please make sure the allocation is aligned."),
Review Comment:
This is to clarify the error message for users who don't know too much
details about the implementation.
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