[I] Fix error propagation in CPP [fluss-rust]

["fresh-borzoni (via GitHub)" <gi...@apache.org>]

fresh-borzoni opened a new issue, #383:
URL: https://github.com/apache/fluss-rust/issues/383

   ### Search before asking
   
   - [x] I searched in the [issues](https://github.com/apache/fluss-rust/issues) and found nothing similar.
   
   
   ### Description
   
   CXX's Result<T> bridge converts Rust errors into rust::Error, which only carries a String message, so error code is lost as a separate entity.
   Solution: introduce FFI intermediate struct and preserve the code.
   
   ### Willingness to contribute
   
   - [x] I'm willing to submit a PR!


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Re: [I] Fix error propagation in CPP for pointer returining methods [fluss-rust]

["luoyuxia (via GitHub)" <gi...@apache.org>]

luoyuxia closed issue #383: Fix error propagation in CPP for pointer returining methods
URL: https://github.com/apache/fluss-rust/issues/383


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