Jefffrey commented on code in PR #10748:
URL: https://github.com/apache/arrow-rs/pull/10748#discussion_r3813216601
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arrow-arith/src/arity.rs:
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@@ -270,11 +270,17 @@ where
}
let len = a.len();
- if a.null_count() == 0 && b.null_count() == 0 {
+ // Physical nulls are not the whole story: a `RunArray` or
`DictionaryArray` can have
+ // logical nulls in its values while its own null buffer is absent.
`is_nullable` covers
+ // those, but is allowed to be conservative, so the union of the logical
nulls can still
+ // be empty.
Review Comment:
thanks i missed that
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