Replace Result verion FileReader::Make

Author: hiroyuki-sato

cpp/src/gandiva/tests/generate_data.h

@@ -36,8 +36,9 @@ class DataGenerator {
 
 class Random {
  public:
-  Random() : gen_(::arrow::internal::GetRandomSeed()) {}
-  explicit Random(uint64_t seed) : gen_(seed) {}
+  Random()
+      : gen_(static_cast<decltype(gen_)::result_type>(
+            ::arrow::internal::GetRandomSeed())) {}
 
   int32_t next() { return gen_(); }
 

cpp/src/parquet/arrow/reader_writer_benchmark.cc

@@ -798,10 +798,10 @@ static void BM_ReadMultipleRowGroupsGenerator(::benchmark::State& state) {
   while (state.KeepRunning()) {
     auto reader =
         ParquetFileReader::Open(std::make_shared<::arrow::io::BufferReader>(buffer));
-    std::unique_ptr<FileReader> unique_reader;
-    ASSIGN_OR_ABORT(unique_reader,
-                    FileReader::Make(::arrow::default_memory_pool(), std::move(reader)));
-    std::shared_ptr<FileReader> arrow_reader = std::move(unique_reader);
+    auto arrow_reader_result =
+        FileReader::Make(::arrow::default_memory_pool(), std::move(reader));
+    EXIT_NOT_OK(arrow_reader_result.status());
+    std::shared_ptr<FileReader> arrow_reader = std::move(*arrow_reader_result);
     ASSIGN_OR_ABORT(auto generator,
                     arrow_reader->GetRecordBatchGenerator(arrow_reader, rgs, {0}));
     auto fut = ::arrow::CollectAsyncGenerator(generator);