Phoenix500526 commented on PR #11374:
URL: https://github.com/apache/arrow-rs/pull/11374#issuecomment-6470970157

   I found an edge case in the existing StreamDecoder that affects this 
wrapper: a schema-only stream without an EOS marker. decode() consumes the 
schema metadata and switches to Body, but exits because the input buffer is 
empty, even though bodyLength == 0. This leaves schema() as None, and finish() 
reports Unexpected End of Stream.
   
   The [IPC 
specification](https://arrow.apache.org/docs/format/Columnar.html#ipc-streaming-format)
 allows streams to end without an explicit EOS marker. I’ve opened 
[#11967](https://github.com/apache/arrow-rs/pull/11967) with a fix and a 
regression test. See [#11966](https://github.com/apache/arrow-rs/issues/11966) 
for the details and a minimal reproduction.


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