[GitHub] [arrow] tdcmeehan opened a new issue, #37527: [C++][Java][Python][FlightRPC] Allow FlightInfo#Schema to be nullable for long-running queries

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

tdcmeehan opened a new issue, #37527:
URL: https://github.com/apache/arrow/issues/37527

   ### Describe the enhancement requested
   
   With #36155, implementations of Flight RPC may not return quickly via a newly added `pollFlightInfo` function.  Sometimes, the system implementing this function may not know the output schema for some time--for example, after a lengthy queue time as elapsed, or after planning.
   
   In proto3, fields may not be present, and it's a coding convention to require them [^1]. To support upcoming client integration work for `pollFlightInfo`, the `schema` field can be made optional so that it's not a requirement to populate the `FlightInfo`'s schema on the first `pollFlightInfo` request.
   
   We can modify our client code to allow this field to be optional.  This is already the case for the Go code.
   
   CC: @lidavidm
   
   [^1]: https://protobuf.dev/programming-guides/field_presence/
   
   ### Component(s)
   
   C++, Java, Python


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[GitHub] [arrow] lidavidm commented on issue #37527: [C++][Java][Python][FlightRPC] Allow FlightInfo#Schema to be nullable for long-running queries

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

lidavidm commented on issue #37527:
URL: https://github.com/apache/arrow/issues/37527#issuecomment-1715802980

   I added #37677 for C++ to the list.


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