jorgecarleitao commented on issue #347:
URL: https://github.com/apache/arrow-rs/issues/347#issuecomment-850961026
I agree that it would be great to have a method to specify all capacities.
The required capacity is usually dependent on the problem over which
`MutableArrayData` is used for. Therefore, I suggest that the calculation of
which capacity to use to be made by the user of `MutableArrayData`, and not
inside `MutableArrayData` itself.
In this context, a way to address this is to allow something like
```rust
MutableArrayData::with_capacities(capacities: Capacities);
enum Capacities {
Binary(usize, Option<usize>), // Binary, Utf8
List(usize, Option<Box<Capacities>>),
...
}
```
and let `MutableArrayData` panic if the capacity variant is incompatible
with the arrays' `DataType`.
This gives users the freedom to pass other capacities.
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