alamb commented on code in PR #7922:
URL: https://github.com/apache/arrow-rs/pull/7922#discussion_r2205211356
##########
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));
Review Comment:
I think this looks reasonable to me and is consistent with the docs
https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.size_hint
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