Is your feature request related to a problem or challenge? Please describe what you are trying to do.
We are building our application on top of FlightSQL as the transport protocol, with the eventual goal of FlightSQL: #3301

We make heavy use of DictionaryArrays to encode low cardinality string data. At the moment, we need to decode DictionaryArrays prior to sending them via Arrow Flight -- see https://github.com/influxdata/influxdb_iox/issues/1318

Describe the solution you'd like
I would like the Flight Client / stuff in arrow-rs to handle Dictionary encoded data efficiently and correctly.

Describe alternatives you've considered

Additional context
Possibly related / duplicate: #1206

cc @tustvold and @avantgardnerio