Rich-T-kid commented on code in PR #12088:
URL: https://github.com/apache/arrow-rs/pull/12088#discussion_r4486199301
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arrow-array/src/array/mod.rs:
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@@ -432,6 +432,18 @@ pub unsafe trait Array: std::fmt::Debug + Send + Sync {
/// A reference-counted reference to a generic `Array`
pub type ArrayRef = Arc<dyn Array>;
+/// Returns `true` if two child value arrays have the same layout and backing
buffers.
+///
+/// This is useful for recognizing shared values in [`DictionaryArray`] and
[`RunArray`].
+/// It first checks whether the [`ArrayRef`]s point to the same allocation,
then falls back
+/// to [`ArrayData::ptr_eq`] to recognize shallow clones such as
`Arc::new(array.clone())`.
+///
+/// This checks storage identity, not logical equality: arrays with equal
values but
+/// different buffers return `false`.
Review Comment:
will do
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