alamb commented on code in PR #7922:
URL: https://github.com/apache/arrow-rs/pull/7922#discussion_r2211088521


##########
parquet-variant/src/builder.rs:
##########
@@ -402,6 +402,11 @@ impl<S: AsRef<str>> FromIterator<S> for MetadataBuilder {
 
 impl<S: AsRef<str>> Extend<S> for MetadataBuilder {
     fn extend<T: IntoIterator<Item = S>>(&mut self, iter: T) {
+        let iter = iter.into_iter();
+        let (min, max) = iter.size_hint();
+
+        self.field_names.reserve(max.unwrap_or(min));
+
         for field_name in iter {
             self.upsert_field_name(field_name.as_ref());

Review Comment:
   fixed



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