lidavidm commented on a change in pull request #8962:
URL: https://github.com/apache/arrow/pull/8962#discussion_r546065801
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File path: cpp/src/arrow/flight/serialization_internal.cc
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@@ -374,7 +374,18 @@ grpc::Status FlightDataDeserialize(ByteBuffer* buffer,
FlightData* out) {
buffer->Clear();
// TODO(wesm): Where and when should we verify that the FlightData is not
- // malformed or missing components?
+ // malformed?
+
+ // Set default values for unspecified FlightData fields
+ if (out->app_metadata == nullptr) {
+ out->app_metadata = std::make_shared<Buffer>(nullptr, 0);
+ }
+ if (out->metadata == nullptr) {
+ out->metadata = std::make_shared<Buffer>(nullptr, 0);
+ }
Review comment:
I think the test failures might come from this, actually - if there's a
metadata buffer, that causes some code to assume this must be a schema or
record batch and try to parse it accordingly (but it'll then encounter the
empty buffer and fail to parse it).
Also, the app_metadata buffer can be omitted - it's meant to be optional so
having an empty vs null one is no big deal.
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