yiteng-guo opened a new issue, #37487:
URL: https://github.com/apache/arrow/issues/37487
### Describe the bug, including details regarding any error messages,
version, and platform.
```
# test.py
import pyarrow.dataset as pads
ds = pads.dataset("/tmp/test.parq", format="parquet") # can be any parquet
ds.count_rows(use_threads=False)
```
`ARROW_IO_THREADS=1 python test.py` hangs forever. I traced this and it's
stuck in `GetReader`.
```
arrow::FutureImpl::Wait
> arrow::dataset::ParquetFileFormat::GetReader
> arrow::dataset::ParquetFileFragment::EnsureCompleteMetadata
```
It works normally if I use any `ARROW_IO_THREADS` larger than 1. I
reproduced this on mac with version `13.0.0` and linux with version `12.0.0`.
### Component(s)
Python
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