tustvold commented on code in PR #1588:
URL: https://github.com/apache/arrow-rs/pull/1588#discussion_r867163842
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parquet/src/arrow/array_reader/list_array.rs:
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@@ -193,122 +245,267 @@ mod tests {
use crate::file::reader::{FileReader, SerializedFileReader};
use crate::schema::parser::parse_message_type;
use crate::schema::types::SchemaDescriptor;
- use arrow::array::{Array, LargeListArray, ListArray, PrimitiveArray};
- use arrow::datatypes::{Field, Int32Type as ArrowInt32};
+ use arrow::array::{Array, ArrayDataBuilder, PrimitiveArray};
+ use arrow::datatypes::{Field, Int32Type as ArrowInt32, Int32Type};
use std::sync::Arc;
- #[test]
- fn test_list_array_reader() {
- // [[1, null, 2], null, [3, 4]]
+ fn list_type<OffsetSize: OffsetSizeTrait>(
+ data_type: ArrowType,
+ item_nullable: bool,
+ ) -> ArrowType {
+ let field = Box::new(Field::new("item", data_type, item_nullable));
+ match OffsetSize::is_large() {
+ true => ArrowType::LargeList(field),
+ false => ArrowType::List(field),
+ }
+ }
+
+ fn downcast<OffsetSize: OffsetSizeTrait>(
+ array: &ArrayRef,
+ ) -> &'_ GenericListArray<OffsetSize> {
+ array
+ .as_any()
+ .downcast_ref::<GenericListArray<OffsetSize>>()
+ .unwrap()
+ }
+
+ fn to_offsets<OffsetSize: OffsetSizeTrait>(values: Vec<usize>) -> Buffer {
+ Buffer::from_iter(
+ values
+ .into_iter()
+ .map(|x| OffsetSize::from_usize(x).unwrap()),
+ )
+ }
+
+ fn test_nested_list<OffsetSize: OffsetSizeTrait>() {
+ // 3 lists, with first and third nullable
+ // [
+ // [
+ // [[1, null], null, [4], []],
+ // [],
+ // [[7]],
+ // [[]]
+ // ],
+ // null,
+ // [],
+ // [[[11]]]
+ // ]
+
+ let l3_item_type = ArrowType::Int32;
+ let l3_type = list_type::<OffsetSize>(l3_item_type.clone(), true);
+
+ let l2_item_type = l3_type.clone();
+ let l2_type = list_type::<OffsetSize>(l2_item_type.clone(), true);
+
+ let l1_item_type = l2_type.clone();
+ let l1_type = list_type::<OffsetSize>(l1_item_type.clone(), false);
+
+ let leaf = PrimitiveArray::<Int32Type>::from_iter(vec![
+ Some(1),
+ None,
+ Some(4),
+ Some(7),
+ Some(11),
+ ]);
+
+ // [[1, null], null, [4], [], [7], [], [11]]
+ let offsets = to_offsets::<OffsetSize>(vec![0, 2, 2, 3, 3, 4, 4, 5]);
+ let l3 = ArrayDataBuilder::new(l3_type.clone())
+ .len(7)
+ .add_buffer(offsets)
+ .add_child_data(leaf.data().clone())
+ .null_bit_buffer(Buffer::from([0b01111101]))
+ .build()
+ .unwrap();
+
+ // [[[1, null], null, [4], []],[], [[7]], [[]], [[11]]]
+ let offsets = to_offsets::<OffsetSize>(vec![0, 4, 4, 5, 6, 7]);
+ let l2 = ArrayDataBuilder::new(l2_type.clone())
+ .len(5)
+ .add_buffer(offsets)
+ .add_child_data(l3)
+ .build()
+ .unwrap();
+
+ let offsets = to_offsets::<OffsetSize>(vec![0, 4, 4, 4, 5]);
Review Comment:
There is a `[1, null]`, can probably add more though
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