Method TestDoExchangeWriteOnlySchema

cpp/src/arrow/flight/test_definitions.cc:389–403

Test sending a schema without any data, as this hits an edge case in the client-side writer.

// Test sending a schema without any data, as this hits an edge case
// in the client-side writer.
void DataTest::TestDoExchangeWriteOnlySchema() {
  auto descr = FlightDescriptor::Command("counter");
  ASSERT_OK_AND_ASSIGN(auto exchange, client_->DoExchange(descr));
  std::unique_ptr<FlightStreamReader> reader = std::move(exchange.reader);
  std::unique_ptr<FlightStreamWriter> writer = std::move(exchange.writer);
  auto schema = arrow::schema({field("f1", arrow::int32())});
  ASSERT_OK(writer->Begin(schema));
  ASSERT_OK(writer->WriteMetadata(Buffer::FromString("foo")));
  ASSERT_OK(writer->DoneWriting());
  ASSERT_OK_AND_ASSIGN(auto chunk, reader->Next());
  ASSERT_EQ(nullptr, chunk.data);
  ASSERT_NE(nullptr, chunk.app_metadata);
  ASSERT_EQ("0", chunk.app_metadata->ToString());
  ASSERT_OK(writer->Close());
}
// Emulate DoGet
void DataTest::TestDoExchangeGet() {
  auto descr = FlightDescriptor::Command("get");