Jefffrey commented on code in PR #10176:
URL: https://github.com/apache/arrow-rs/pull/10176#discussion_r3451701394
##########
arrow-select/src/take.rs:
##########
@@ -256,11 +256,18 @@ fn take_impl<IndexType: ArrowPrimitiveType>(
*length as u32,
)?))
}
- DataType::Map(_, _) => {
+ DataType::Map(field, ordered) => {
let list_arr = ListArray::from(values.as_map().clone());
let list_data = take_list::<_, Int32Type>(&list_arr, indices)?;
- let builder =
list_data.into_data().into_builder().data_type(values.data_type().clone());
- Ok(Arc::new(MapArray::from(unsafe { builder.build_unchecked() })))
+ let (_, offsets, entries, nulls) = list_data.into_parts();
+ let entries = entries.as_struct().clone();
+ Ok(Arc::new(MapArray::try_new(
Review Comment:
i suppose the checks inside `try_new` are cheap enough to not be too much of
an impact 👍
##########
arrow-select/src/take.rs:
##########
@@ -710,18 +717,15 @@ where
"New offsets was filled under/over the expected capacity"
);
- let child_data = array_data.freeze();
- let value_offsets = Buffer::from_vec(new_offsets);
-
- let list_data = ArrayDataBuilder::new(values.data_type().clone())
- .len(indices.len())
- .nulls(nulls)
- .offset(0)
- .add_child_data(child_data)
- .add_buffer(value_offsets);
+ let field = match values.data_type() {
+ DataType::List(field) | DataType::LargeList(field) => field.clone(),
+ d => unreachable!("take_list called with non-list data type {d}"),
+ };
+ // SAFETY: `new_offsets` is constructed to be monotonically increasing
above
+ let offsets = unsafe {
OffsetBuffer::new_unchecked(ScalarBuffer::from(new_offsets)) };
+ let child = make_array(array_data.freeze());
- let list_data = unsafe { list_data.build_unchecked() };
- Ok(GenericListArray::<OffsetType::Native>::from(list_data))
+ GenericListArray::<OffsetType::Native>::try_new(field, offsets, child,
nulls)
Review Comment:
same here
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