nevi-me commented on a change in pull request #8609:
URL: https://github.com/apache/arrow/pull/8609#discussion_r520092924
##########
File path: rust/arrow/src/array/union.rs
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@@ -698,7 +699,11 @@ mod tests {
4 * 8 * 4 * mem::size_of::<i32>(),
union.get_buffer_memory_size()
);
- let internals_of_union_array = (8 + 72) + (union.boxed_fields.len() *
144); // Arc<ArrayData> & Vec<ArrayRef> combined.
+ let tagged_pointer_size = POINTER_WIDTH / 4 + POINTER_WIDTH;
+ let internals_of_union_array = tagged_pointer_size
Review comment:
I struggled to follow the arithmetic here, but perhaps I need to look at
the spec again
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