BryanCutler opened a new pull request, #38110:
URL: https://github.com/apache/arrow/pull/38110
### Rationale for this change
The Java FlightStream can raise an error if metadata is transferred and ends
up being closed twice.
```
java.lang.IllegalStateException: RefCnt has gone negative
at
org.apache.arrow.util.Preconditions.checkState(Preconditions.java:458)
at org.apache.arrow.memory.BufferLedger.release(BufferLedger.java:130)
at org.apache.arrow.memory.BufferLedger.release(BufferLedger.java:104)
at org.apache.arrow.memory.ArrowBuf.close(ArrowBuf.java:1044)
at org.apache.arrow.util.AutoCloseables.close(AutoCloseables.java:97)
at org.apache.arrow.flight.FlightStream.close(FlightStream.java:208)
```
### What changes are included in this PR?
When FlightStream is closed, remove any reference of previous metadata to
prevent reference count going negative if closed again. Also added
`ExchangeReaderWriter.getResult()` for convenience and clear up ambiguity on
error handling.
### Are these changes tested?
Unit tests added for closing with metadata and
### Are there any user-facing changes?
Added `ExchangeReaderWriter.getResult()`
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