tustvold commented on code in PR #1589:
URL: https://github.com/apache/arrow-rs/pull/1589#discussion_r853510330


##########
arrow/src/array/equal/utils.rs:
##########
@@ -183,10 +178,8 @@ pub(super) fn child_logical_null_buffer(
             let array_offset = parent_data.offset();
             let mut buffer = MutableBuffer::new_null(parent_len);
             let null_slice = buffer.as_slice_mut();
-            (0..parent_len).for_each(|index| {
-                if parent_bitmap.is_set(index + array_offset)
-                    && self_null_bitmap.is_set(index + array_offset)
-                {
+            (array_offset..parent_len + array_offset).for_each(|index| {

Review Comment:
   As the Buffer is interchangeable with the buffer from ArrayData it needs to 
be created with the array offset, see FixedSizeList above



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