friendlymatthew commented on code in PR #7833:
URL: https://github.com/apache/arrow-rs/pull/7833#discussion_r2176125328
##########
parquet-variant/src/builder.rs:
##########
@@ -233,29 +233,38 @@ impl ValueBuffer {
#[derive(Default)]
struct MetadataBuilder {
- field_name_to_id: BTreeMap<String, u32>,
- field_names: Vec<String>,
+ // Field names -- field_ids are assigned in insert order
+ field_names: IndexSet<String>,
}
impl MetadataBuilder {
+ /// Pre-populates the list of field names
+ fn from_field_names(field_name: &[&str]) -> Self {
+ Self {
+ field_names: IndexSet::from_iter(field_name.iter().map(|f|
f.to_string())),
+ }
+ }
+
+ /// Checks whether field names by insertion order is lexicographically
sorted
+ fn is_sorted(&self) -> bool {
+ !self.field_names.is_empty() && self.field_names.iter().is_sorted()
Review Comment:
If there are no field names in the variant, we'll mark it as not sorted.
The spec leaves this pretty ambiguous..
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