Alexander created ARROW-10939:
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Summary: [C#][FlightRPC] incompatible with java client for empty
record batches
Key: ARROW-10939
URL: https://issues.apache.org/jira/browse/ARROW-10939
Project: Apache Arrow
Issue Type: Bug
Components: C#, FlightRPC
Reporter: Alexander
An error has been found when one sends an empty record batch from C# server and
tries to read it with the java client.
>From investigation the java client requires the protobuf tags to be sent in
>the message even though it is empty. Java code can be seen here:
[https://github.com/apache/arrow/blob/master/java/flight/flight-core/src/main/java/org/apache/arrow/flight/ArrowMessage.java]
Normal functionality of gRPC is to exclude the entire tag if an object is
empty, example code from generated csharp:
if (DataBody.Length != 0) {
output.WriteRawTag(194, 62);
output.WriteBytes(DataBody);
}
To fix this so the csharp version is compatible with the java client requires a
non empty flight data body must be sent or at least the tag of the body.
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