alamb opened a new pull request, #3594:
URL: https://github.com/apache/arrow-rs/pull/3594

   # Which issue does this PR close?
   
   Closes https://github.com/apache/arrow-rs/issues/3591
   
   # Rationale for this change
    
   Some Flight clients expect to see Schema messages even if there is no data 
(e.g. an empty result set)
   
   # What changes are included in this PR?
   1. Add `with_schema` to `FlightDataEncoderBuilder` to specify schema when 
creating streams
   2. Allow users to retrieve the decoded schema in the `FlightDataDecoder`
   3. Tests
   
   # Are there any user-facing changes?
   1. `FlightDataDecoder` now has `schema()` that returns the actual schema 
rather than `got_schema()` which returns a boolean
   
   2. `FlightDataEncoderBuilder::with_schema`


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