scovich commented on code in PR #9599:
URL: https://github.com/apache/arrow-rs/pull/9599#discussion_r2977864246
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parquet-variant-compute/src/variant_to_arrow.rs:
##########
@@ -941,7 +942,14 @@ where
match value {
Variant::List(list) => {
for element in list.iter() {
- self.element_builder.append_value(element)?;
+ match element {
Review Comment:
Not sure I understand.
We already _know_ we're dealing with an array element, so what goes wrong if
we just write `Variant::Null`? That would append the value and mark it as
non-null, which _seems_ to be exactly what
[append_to_null_row](https://github.com/apache/arrow-rs/pull/9599/changes#diff-fd0ec8577d0f6349176a0dfa6a1d201b79823a965c45b6b63400c5fe360e348cR127-R131)
does for `ANM::ArrayElement` case?
```rust
match self {
Self::TopLevelVariant => nulls.append_null(),
=> Self::ObjectField | Self::ArrayElement =>
nulls.append_non_null(),
}
match self {
Self::TopLevelVariant | Self::ObjectField =>
value_builder.append_null(),
=> Self::ArrayElement => value_builder.append_value(Variant::Null),
}
```
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