alamb commented on code in PR #2886:
URL: https://github.com/apache/arrow-rs/pull/2886#discussion_r998545852
##########
arrow-array/src/array/list_array.rs:
##########
@@ -157,47 +157,26 @@ impl<OffsetSize: OffsetSizeTrait>
GenericListArray<OffsetSize> {
pub fn from_iter_primitive<T, P, I>(iter: I) -> Self
where
T: ArrowPrimitiveType,
- P: AsRef<[Option<<T as ArrowPrimitiveType>::Native>]>
- + IntoIterator<Item = Option<<T as ArrowPrimitiveType>::Native>>,
+ P: IntoIterator<Item = Option<<T as ArrowPrimitiveType>::Native>>,
I: IntoIterator<Item = Option<P>>,
{
- let iterator = iter.into_iter();
- let (lower, _) = iterator.size_hint();
-
- let mut offsets =
- MutableBuffer::new((lower + 1) *
std::mem::size_of::<OffsetSize>());
- let mut length_so_far = OffsetSize::zero();
- offsets.push(length_so_far);
-
- let mut null_buf = BooleanBufferBuilder::new(lower);
-
- let values: PrimitiveArray<T> = iterator
- .filter_map(|maybe_slice| {
- // regardless of whether the item is Some, the offsets and
null buffers must be updated.
- match &maybe_slice {
- Some(x) => {
- length_so_far +=
- OffsetSize::from_usize(x.as_ref().len()).unwrap();
- null_buf.append(true);
+ let iter = iter.into_iter();
+ let size_hint = iter.size_hint().0;
+ let mut builder =
+ GenericListBuilder::with_capacity(PrimitiveBuilder::<T>::new(),
size_hint);
+
+ for i in iter {
+ match i {
+ Some(p) => {
+ for t in p {
+ builder.values().append_option(t);
}
- None => null_buf.append(false),
- };
- offsets.push(length_so_far);
- maybe_slice
- })
- .flatten()
- .collect();
-
- let field = Box::new(Field::new("item", T::DATA_TYPE, true));
- let data_type = Self::DATA_TYPE_CONSTRUCTOR(field);
- let array_data = ArrayData::builder(data_type)
- .len(null_buf.len())
- .add_buffer(offsets.into())
- .add_child_data(values.into_data())
- .null_bit_buffer(Some(null_buf.into()));
- let array_data = unsafe { array_data.build_unchecked() };
-
- Self::from(array_data)
+ builder.append(true);
+ }
+ None => builder.append(false),
Review Comment:
does this need
```
builder.values().append_nulls(l);
```
As was added in https://github.com/apache/arrow-rs/pull/2887?
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