wangfenjin opened a new pull request #1386:
URL: https://github.com/apache/arrow-rs/pull/1386


   This is an attempt to support flight-sql in arrow-rs. Currently I only 
implement the server mod, but I'd like to send out the PR so I can get the code 
review to make sure I'm in the right direction.
   
   example: https://github.com/wangfenjin/arrow-datafusion/pull/1
   
   TODOs:
   - [ ] Impl client
   - [ ] Make flight-sql as an optional feature?
   
   Question:
   flight-sql use protobuf Any a lot, but prost doesn't support that very well, 
specifically the UnpackTo/PackFrom method in cpp. I asked the question in 
https://github.com/fdeantoni/prost-wkt/issues/14 but got no response yet. So 
currently I need to use protoc-rust to generate the pb and in the 
[example](https://github.com/wangfenjin/arrow-datafusion/pull/1) I can do the 
marshal/unmarshal. Not sure if there is a better way? Or do we need to stick to 
prost?
   
   Address #1323 


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