sunchao commented on pull request #9409:
URL: https://github.com/apache/arrow/pull/9409#issuecomment-773490122
> Calling mem::forget on the Vec<Box<dyn ArrayBuilder>> prevents the
vector's destructor from running.
Hmm isn't that the purpose?
```rust
let builders = std::mem::replace(&mut self.field_builders,
Vec::new());
std::mem::forget(builders);
```
the `builders` is forgotten here but the destructor for `self.field_any`
will still be invoked right?
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