tustvold commented on code in PR #6721:
URL: https://github.com/apache/arrow-rs/pull/6721#discussion_r1837757269
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arrow-array/src/array/mod.rs:
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@@ -315,8 +315,7 @@ pub trait Array: std::fmt::Debug + Send + Sync {
/// even if the nulls present in [`DictionaryArray::values`] are not
referenced by any key,
/// and therefore would not appear in [`Array::logical_nulls`].
fn is_nullable(&self) -> bool {
- // TODO this is not necessarily perfect default implementation, since
null_count() and logical_null_count() are not always equivalent
- self.null_count() != 0
+ self.logical_null_count() != 0
Review Comment:
Can we provide alternative implementations DictionaryArray and UnionArray as
part of this, currently this will significantly regress performance for them
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