eeroel commented on code in PR #37918:
URL: https://github.com/apache/arrow/pull/37918#discussion_r1340976119
##########
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:
Ah, I see, thanks. For some reason I get a `note: copy constructor is
implicitly deleted because 'unique_ptr<parquet::ParquetFileReader>' has a
user-declared move constructor` if I try to return the future, any idea what
I'm missing?
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