Fix alignment errors when receiving empty arrays

Empty `Vec`s have a dummy pointer that is set to the alignment of the item type. Thus, the pointer for empty `Vec<u8>` data is `0x1`. Using this pointer to construct a `ArrayData` instance can lead to alignment errors if the arrow array is of a type with larger alignment, e.g. float64.

This commit fixes the alignment error by checking for an empty raw buffer and constructing an empty `ArrayData` instance in this case.

Fixes #362

apis/rust/node/src/event_stream/event.rs

@@ -57,7 +57,11 @@ pub struct SharedMemoryData {
 fn buffer_into_arrow_array(
     raw_buffer: &arrow::buffer::Buffer,
     type_info: &ArrowTypeInfo,
-) -> std::result::Result<arrow::array::ArrayData, eyre::Error> {
+) -> eyre::Result<arrow::array::ArrayData> {
+    if raw_buffer.is_empty() {
+        return Ok(arrow::array::ArrayData::new_empty(&type_info.data_type));
+    }
+
     let mut buffers = Vec::new();
     for BufferOffset { offset, len } in &type_info.buffer_offsets {
         buffers.push(raw_buffer.slice_with_length(*offset, *len));