sdf-jkl commented on code in PR #9599:
URL: https://github.com/apache/arrow-rs/pull/9599#discussion_r2977874158
##########
parquet-variant-compute/src/shred_variant.rs:
##########
@@ -102,19 +102,50 @@ pub fn shred_variant(array: &VariantArray, as_type:
&DataType) -> Result<Variant
))
}
+/// Controls how `append_null` is encoded for a shredded `(value,
typed_value)` pair.
+///
+/// | Mode | Struct validity bit | `value` | `typed_value` | Meaning |
+/// | --- | --- | --- | --- | --- |
+/// | `TopLevelVariant` | null | NULL | NULL | SQL NULL at the top-level
variant row |
+/// | `ObjectField` | non-null | NULL | NULL | Missing object field |
+/// | `ArrayElement` | non-null | `Variant::Null` | NULL | Explicit null array
element |
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) enum AppendNullMode {
+ TopLevelVariant,
+ ObjectField,
+ ArrayElement,
+}
+
+impl AppendNullMode {
+ fn append_to_null_row(
Review Comment:
True...
Wouldn't `append_null` look weird?
```rust
fn append_null(&mut self) -> Result<()> {
self.null_mode
.append_null(&mut self.nulls, &mut self.value_builder)
```
I think I like the `append_null_to` more:
```rust
fn append_null(&mut self) -> Result<()> {
self.null_mode
.append_null_to(&mut self.nulls, &mut self.value_builder)
```
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