[GitHub] [arrow] vertexclique commented on a change in pull request #8609: ARROW-10513: [Rust]: ARMv7 compilation

[GitBox <gi...@apache.org>]

vertexclique commented on a change in pull request #8609:
URL: https://github.com/apache/arrow/pull/8609#discussion_r520177140



##########
File path: rust/arrow/src/array/union.rs
##########
@@ -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:
       Please do. Calculated nestedness and pointer table from my mind. Just tried to write a little bit more clearly which part of the pointers accounts for which part of the arrays with this pr.




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