jhorstmann opened a new issue #503:
URL: https://github.com/apache/arrow-rs/issues/503
**Describe the bug**
The memory usage calculation for dictionary arrays seems to report twice the
actual used memory.
```
fn get_array_memory_size(&self) -> usize {
self.data.get_array_memory_size()
+ self.keys.get_array_memory_size()
+ self.values.get_array_memory_size()
+ mem::size_of_val(self)
}
```
In the above code, `self.keys` and `self.values` are pointing to the same
data that is in `self.data` and so would be counted twice.
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**Additional context**
The memory usage calculation could actually work the same for all array
types and could be implemented as a default method on the `Array` trait.
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