[GitHub] [arrow-rs] alamb opened a new issue #1413: Implement Basic FlightSQL Client

[GitBox]

alamb opened a new issue #1413:
URL: https://github.com/apache/arrow-rs/issues/1413


   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   The Arrow Flight SQL protocol (TODO link) makes use of `protobuf.Any` which 
is somewhat messy to use in Rust, meaning implementing FlightSQL clients in 
Rust is somewhat messy
   
   @wangfenjin  implemented a `FlightSqlServer` trait to assist with the server 
side of this in  https://github.com/apache/arrow-rs/pull/1386. It would be nice 
to implement the equivalent on the client side. 
   
   **Describe the solution you'd like**
   To make it easier for people to write flight SQL clients and servers, it 
would be nice if the arrow-rs crate provided a trait that handled the Any 
conversion.
   
   Perhaps we can als include an `flight_sql_client.cpp`  inspiration from 
@lidavidm 's  
https://github.com/apache/arrow/blob/master/cpp/examples/arrow/flight_sql_example.cc
  in the cpp implementation, as shown in 
https://github.com/wangfenjin/arrow-datafusion/pull/1
   
   Something like
   
   ```rust
   pub struct FlightSqlClient { .. }
   
   impl FlightSqlClient {
       /// Creates a new client with the provided connection
       pub fn new(channel: Connection) -> Self {
         .. 
       }
   
       /// Do the appropriate requests of
       /// `DoPut` to send `CommandStatementQuery` and then call 
`GetFlightInfo` to get back the stream of results
       async fn query(
           &mut self,
           query: CommandStatementQuery,
           request: FlightDescriptor,
       ) -> Result<SendableRecordBatchStream, Status>;
   
    ... probably other things
   }
   ```
   
   
   **Describe alternatives you've considered**
   A clear and concise description of any alternative solutions or features 
you've considered.
   
   **Additional context**
   See server implementation here https://github.com/apache/arrow-rs/pull/1386
   
   
   
   


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