a10y commented on code in PR #8645:
URL: https://github.com/apache/arrow-rs/pull/8645#discussion_r2456338324
##########
arrow-select/src/take.rs:
##########
@@ -621,6 +627,58 @@ where
Ok(GenericListArray::<OffsetType::Native>::from(list_data))
}
+fn take_list_view<IndexType, OffsetType>(
+ values: &GenericListViewArray<OffsetType::Native>,
+ indices: &PrimitiveArray<IndexType>,
+) -> Result<GenericListViewArray<OffsetType::Native>, ArrowError>
+where
+ IndexType: ArrowPrimitiveType,
+ OffsetType: ArrowPrimitiveType,
+ OffsetType::Native: OffsetSizeTrait,
+{
+ // Take executes only over the views.
+ let mut taken_offsets: Vec<OffsetType::Native> =
Vec::with_capacity(indices.len());
+ let mut taken_sizes: Vec<OffsetType::Native> =
Vec::with_capacity(indices.len());
+
+ // Initialize null buffer
+ let num_bytes = bit_util::ceil(indices.len(), 8);
+ let mut null_buf = MutableBuffer::new(num_bytes).with_bitset(num_bytes,
true);
+ let null_slice = null_buf.as_slice_mut();
+
+ for i in 0..indices.len() {
+ if indices.is_valid(i) {
+ let idx = indices
+ .value(i)
+ .to_usize()
+ .ok_or_else(|| ArrowError::ComputeError("Cast to usize
failed".to_string()))?;
+ taken_offsets.push(values.value_offset(idx));
+ taken_sizes.push(values.value_size(idx));
+
+ if !values.is_valid(idx) {
+ bit_util::unset_bit(null_slice, i);
+ }
+ } else {
Review Comment:
i realized that i could rewrite most of this with `take_native` and
`take_nulls` which optimize for those codepaths.
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