Steven Fackler created ARROW-11488:
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Summary: [Rust]: StructBuilder's Drop impl leaks memory
Key: ARROW-11488
URL: https://issues.apache.org/jira/browse/ARROW-11488
Project: Apache Arrow
Issue Type: Bug
Components: Rust
Affects Versions: 3.0.0
Reporter: Steven Fackler
The StructBuilder stores two copies of the inner ArrayBuilders in two separate
Vecs via some unsafe code. To avoid double-dropping the builders, the
StructBuilder Drop impl uses mem::forget on one of the vectors. This avoids
calling the destructor of the ArrayBuilders twice, but also leaks the memory of
the Vec itself.
In addition, the double-vecs with the unsafe code is completely unnecessary
since you can just call `ArrayBuilder::as_mut_any` on the `dyn ArrayBuilder`
instead of having to covert to a `dyn Any`.
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