Dandandan commented on code in PR #7873:
URL: https://github.com/apache/arrow-rs/pull/7873#discussion_r2189269114
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arrow-array/src/array/byte_view_array.rs:
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@@ -473,13 +473,81 @@ impl<T: ByteViewType + ?Sized> GenericByteViewArray<T> {
/// Note: this function does not attempt to canonicalize / deduplicate
values. For this
/// feature see [`GenericByteViewBuilder::with_deduplicate_strings`].
pub fn gc(&self) -> Self {
- let mut builder =
GenericByteViewBuilder::<T>::with_capacity(self.len());
+ // 1) Read basic properties once
+ let len = self.len(); // number of elements
+ let views = self.views(); // raw u128 “view” values per slot
+ let nulls = self.nulls().cloned(); // reuse & clone existing null
bitmap
+
+ // 2) Pre-scan to determine how many out‑of‑line bytes we must store
+ let total_large: usize = (0..len)
+ .filter_map(|i| {
Review Comment:
Can use `0` for `None` instead of using `filter_map`
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