alamb commented on a change in pull request #505:
URL: https://github.com/apache/arrow-rs/pull/505#discussion_r660145714
##########
File path: arrow/src/array/data.rs
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@@ -354,12 +354,7 @@ impl ArrayData {
/// Returns the total number of bytes of memory occupied physically by
this [ArrayData].
pub fn get_array_memory_size(&self) -> usize {
- let mut size = 0;
- // Calculate size of the fields that don't have
[get_array_memory_size] method internally.
- size += mem::size_of_val(self)
- - mem::size_of_val(&self.buffers)
Review comment:
since `child_data` and `null_bitmap` include the size of `self` in the
results of `bitmap.get_array_memory_size()` and `child.get_array_memory_size()`
I think we still need to subtract them off.
Perhaps a pattern such as *edited*
```rust
if let Some(bitmap) = &self.null_bitmap {
size += bitmap.get_array_memory_size()
size -= mem::size_of_val(&bitmap);
}
```
would make the intent clearer
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