eeroel commented on code in PR #37918:
URL: https://github.com/apache/arrow/pull/37918#discussion_r1339765802
##########
cpp/src/arrow/dataset/file_parquet.cc:
##########
@@ -479,11 +479,21 @@ Future<std::shared_ptr<parquet::arrow::FileReader>>
ParquetFileFormat::GetReader
default_fragment_scan_options));
auto properties =
MakeReaderProperties(*this, parquet_scan_options.get(), options->pool);
- ARROW_ASSIGN_OR_RAISE(auto input, source.Open());
+ auto input_fut = source.OpenAsync();
// TODO(ARROW-12259): workaround since we have Future<(move-only type)>
- auto reader_fut = parquet::ParquetFileReader::OpenAsync(
- std::move(input), std::move(properties), metadata);
+
auto path = source.path();
+ auto reader_fut =
+ input_fut.Then([=](const std::shared_ptr<arrow::io::RandomAccessFile>&)
mutable
+ -> Result<std::unique_ptr<parquet::ParquetFileReader>> {
+ ARROW_ASSIGN_OR_RAISE(std::shared_ptr<arrow::io::RandomAccessFile>
input,
+ input_fut.MoveResult());
+ auto rfut = parquet::ParquetFileReader::OpenAsync(
+ std::move(input), std::move(properties), metadata);
+ ARROW_ASSIGN_OR_RAISE(auto reader, rfut.MoveResult());
+ return reader;
Review Comment:
The return value needs to be of type Result, so the future needs to be
unwrapped. Not sure if this was the right way to do it, but seems to work
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