[GitHub] [arrow] westonpace commented on a change in pull request #9620: ARROW-11843: [C++] Provide reentrant Parquet reader

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

westonpace commented on a change in pull request #9620:
URL: https://github.com/apache/arrow/pull/9620#discussion_r626128197



##########
File path: cpp/src/parquet/encryption/read_configurations_test.cc
##########
@@ -237,7 +239,9 @@ TEST_P(TestDecryptionConfiguration, TestDecryption) {
     CheckResults(file_name, decryption_config_num, encryption_config_num);
   }
   // Delete temporary test file.
-  ASSERT_EQ(std::remove(file_name.c_str()), 0);
+  ASSERT_OK_AND_ASSIGN(auto path,

Review comment:
       I don't think this is wrong, I'm just wondering what the reasoning is here for my own education.  Is it to allow paths to be more universal accross platorms?

##########
File path: cpp/src/parquet/file_reader.cc
##########
@@ -563,6 +693,27 @@ std::unique_ptr<ParquetFileReader> ParquetFileReader::OpenFile(
   return Open(std::move(source), props, std::move(metadata));
 }
 
+::arrow::Future<std::unique_ptr<ParquetFileReader>> ParquetFileReader::OpenAsync(
+    std::shared_ptr<::arrow::io::RandomAccessFile> source, const ReaderProperties& props,
+    std::shared_ptr<FileMetaData> metadata) {
+  BEGIN_PARQUET_CATCH_EXCEPTIONS
+  auto fut = SerializedFile::OpenAsync(std::move(source), props, std::move(metadata));
+  auto completed = ::arrow::Future<std::unique_ptr<ParquetFileReader>>::Make();
+  fut.AddCallback([fut, completed](

Review comment:
       Why not use `auto completed = fut.Then`?  Or is this another workaround for ARROW-12259? (in which case maybe add a comment)




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