tustvold commented on code in PR #1964:
URL: https://github.com/apache/arrow-rs/pull/1964#discussion_r909524690
##########
arrow/src/array/array_binary.rs:
##########
@@ -831,22 +831,26 @@ impl DecimalArray {
precision: usize,
scale: usize,
) -> Self {
+ let child_data = &v.data_ref().child_data()[0];
assert_eq!(
- v.data_ref().child_data()[0].child_data().len(),
+ child_data.child_data().len(),
0,
"DecimalArray can only be created from list array of u8 values \
(i.e. FixedSizeList<PrimitiveArray<u8>>)."
);
assert_eq!(
- v.data_ref().child_data()[0].data_type(),
+ child_data.data_type(),
&DataType::UInt8,
"DecimalArray can only be created from FixedSizeList<u8> arrays,
mismatched data types."
);
+ let list_offset = v.offset();
+ let child_offset = child_data.offset();
let builder = ArrayData::builder(DataType::Decimal(precision, scale))
.len(v.len())
- .add_buffer(v.data_ref().child_data()[0].buffers()[0].clone())
- .null_bit_buffer(v.data_ref().null_buffer().cloned());
+
.add_buffer(v.data_ref().child_data()[0].buffers()[0].slice(child_offset))
Review Comment:
```suggestion
.add_buffer(child_data.buffers()[0].slice(child_offset))
```
##########
arrow/src/array/array_binary.rs:
##########
@@ -831,22 +831,26 @@ impl DecimalArray {
precision: usize,
scale: usize,
) -> Self {
+ let child_data = &v.data_ref().child_data()[0];
Review Comment:
Somewhat tangential to this PR, but what happens to the child data's null
buffer? Perhaps worth a docstring saying it is ignored?
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