friendlymatthew commented on code in PR #7833:
URL: https://github.com/apache/arrow-rs/pull/7833#discussion_r2183779196
##########
parquet-variant/src/builder.rs:
##########
@@ -237,18 +237,40 @@ impl ValueBuffer {
struct MetadataBuilder {
// Field names -- field_ids are assigned in insert order
field_names: IndexSet<String>,
+
+ // flag that checks if field names by insertion order are also
lexicographically sorted
+ is_sorted: bool,
}
impl MetadataBuilder {
/// Upsert field name to dictionary, return its ID
fn upsert_field_name(&mut self, field_name: &str) -> u32 {
- let (id, _) = self.field_names.insert_full(field_name.to_string());
+ let (id, new_entry) =
self.field_names.insert_full(field_name.to_string());
+
+ if new_entry {
+ let n = self.num_field_names();
+
+ if n == 1 {
+ self.is_sorted = true;
+ } else {
+ self.is_sorted &= self.field_names[n - 2] < self.field_names[n
- 1];
+ }
+ }
id as u32
}
+ /// Returns the number of field names stored in the metadata builder.
+ /// Note: this method should be the only place to call
`self.field_names.len()`
+ ///
+ /// # Panics
+ ///
+ /// If the number of field names exceeds the maximum allowed value for
`u32`.
fn num_field_names(&self) -> usize {
- self.field_names.len()
+ let n = self.field_names.len();
+ assert!(n < u32::MAX as usize);
+
+ n
Review Comment:
I added an assert here to make sure we fit in a `u32`. This is unrelated to
this PR but addresses
https://github.com/apache/arrow-rs/pull/7833/files#r2180370340.
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