rluvaton commented on issue #6846:
URL: https://github.com/apache/arrow-rs/issues/6846#issuecomment-2528595031
Doing any operation on on list of lists is a pain
If I have `list` of `list` of `i32` using the builder
`GenericListBuilder<i32, GenericListBuilder<i32, Int32Builder>>` I can't use
`append_value` on the top list to add another list:
```rust
#[test]
fn should_run() {
let from: Arc<ListArray> = create_test_list();
let mut to = ListBuilder::new(
ListBuilder::new(
Int32Builder::new()
)
);
let indices: &[usize] = &[0, 1, 2];
let data_type = DataType::List(
Arc::new(Field::new(
"item",
DataType::List(
Arc::new(Field::new(
"item",
DataType::Int32,
false
))
),
false
))
);
for &i in indices {
if from.is_valid(i) {
let inner_list =
from.value(i).as_any().downcast_ref::<GenericListArray<i32>>().unwrap();
to.append_value(inner_list);
} else {
to.append_null();
}
}
}
fn create_test_list() -> Arc<ListArray> {
let primitive_builder = Int32Builder::with_capacity(10);
let values_builder = ListBuilder::new(primitive_builder);
let mut builder = ListBuilder::new(values_builder);
// [[[1, 2], [3, 4]], [[5, 6, 7], null, [8]], null, [[9, 10]]]
builder.values().values().append_value(1);
builder.values().values().append_value(2);
builder.values().append(true);
builder.values().values().append_value(3);
builder.values().values().append_value(4);
builder.values().append(true);
builder.append(true);
builder.values().values().append_value(5);
builder.values().values().append_value(6);
builder.values().values().append_value(7);
builder.values().append(true);
builder.values().append(false);
builder.values().values().append_value(8);
builder.values().append(true);
builder.append(true);
builder.append(false);
builder.values().values().append_value(9);
builder.values().values().append_value(10);
builder.values().append(true);
builder.append(true);
Arc::new(builder.finish())
}
```
It's really a pain
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