https://github.com/ClickHouse/ClickHouse/blob/9a48cf0da8badfc5f3da08611eb44961aa28e3f6/src/Functions/FunctionsHashing.h#L669-L671

There's a call to `blake3_free_char_pointer` that passes ownership of the pointer back to Rust (which then frees the memory), then there's a call to `std::string`'s constructor that accepts that now-freed pointer.
{
        return selector.selectAndExecute(arguments, result_type, input_rows_count);
    }
    static FunctionPtr create(ContextPtr context)
    {
        return std::make_shared<FunctionIntHash>(context);
    }
private:
    ImplementationSelector<IFunction> selector;
};
DECLARE_MULTITARGET_CODE(