[GitHub] [arrow] lidavidm commented on a diff in pull request #13598: ARROW-17078: [C++] Cleaning up C++ Examples

[GitBox <gi...@apache.org>]

lidavidm commented on code in PR #13598:
URL: https://github.com/apache/arrow/pull/13598#discussion_r922108368


##########
cpp/examples/arrow/dataset_documentation_example.cc:
##########
@@ -194,10 +191,10 @@ std::shared_ptr<arrow::Table> FilterAndSelectDataset(
   auto dataset = factory->Finish().ValueOrDie();
   // Read specified columns with a row filter
   auto scan_builder = dataset->NewScan().ValueOrDie();
-  ABORT_ON_FAILURE(scan_builder->Project({"b"}));
-  ABORT_ON_FAILURE(scan_builder->Filter(cp::less(cp::field_ref("b"), cp::literal(4))));
+  ARROW_RETURN_NOT_OK(scan_builder->Project({"b"}));
+  ARROW_RETURN_NOT_OK(scan_builder->Filter(cp::less(cp::field_ref("b"), cp::literal(4))));
   auto scanner = scan_builder->Finish().ValueOrDie();

Review Comment:
   Can we also eliminate all uses of ValueOrDie?



##########
cpp/examples/arrow/dataset_documentation_example.cc:
##########
@@ -194,10 +191,10 @@ std::shared_ptr<arrow::Table> FilterAndSelectDataset(
   auto dataset = factory->Finish().ValueOrDie();
   // Read specified columns with a row filter
   auto scan_builder = dataset->NewScan().ValueOrDie();
-  ABORT_ON_FAILURE(scan_builder->Project({"b"}));
-  ABORT_ON_FAILURE(scan_builder->Filter(cp::less(cp::field_ref("b"), cp::literal(4))));
+  ARROW_RETURN_NOT_OK(scan_builder->Project({"b"}));
+  ARROW_RETURN_NOT_OK(scan_builder->Filter(cp::less(cp::field_ref("b"), cp::literal(4))));
   auto scanner = scan_builder->Finish().ValueOrDie();

Review Comment:
   That applies to other files here too.



##########
cpp/examples/arrow/flight_grpc_example.cc:
##########
@@ -84,20 +75,12 @@ class HelloWorldServiceImpl : public HelloWorldService::Service {
   }
 };
 
-int main(int argc, char** argv) {
-  gflags::ParseCommandLineFlags(&argc, &argv, true);
-
-  if (FLAGS_port < 0) {
-    // For CI
-    std::cout << "Must specify a port with -port" << std::endl;
-    return EXIT_SUCCESS;
-  }
-
+arrow::Status RunFlightGRPC() {

Review Comment:
   ```suggestion
   arrow::Status RunFlightGrpc() {
   ```



##########
cpp/examples/arrow/dataset_documentation_example.cc:
##########
@@ -39,99 +39,96 @@ namespace ds = arrow::dataset;
 namespace fs = arrow::fs;
 namespace cp = arrow::compute;
 
-#define ABORT_ON_FAILURE(expr)                     \
-  do {                                             \
-    arrow::Status status_ = (expr);                \
-    if (!status_.ok()) {                           \
-      std::cerr << status_.message() << std::endl; \
-      abort();                                     \
-    }                                              \
-  } while (0);
+/**
+ * @brief Run Example

Review Comment:
   nit: use `\brief` for consistency with the C++ codebase



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