pitrou opened a new issue, #44991: URL: https://github.com/apache/arrow/issues/44991
### Describe the bug, including details regarding any error messages, version, and platform. Recently the AppVeyor CI jobs have started failing with [this error](https://ci.appveyor.com/project/pitrou/arrow/builds/51141767?fullLog=true#L7524): ``` (arrow) C:\projects\arrow\python>py.test -r sxX --durations=15 --pyargs pyarrow.tests || exit /B ERROR: module or package not found: pyarrow.tests (missing __init__.py?) ============================= test session starts ============================= platform win32 -- Python 3.10.16, pytest-8.3.4, pluggy-1.5.0 rootdir: C:\projects\arrow\python configfile: setup.cfg plugins: hypothesis-6.122.3 collected 0 items ============================ no tests ran in 1.43s ============================ ``` A bit of debugging shows that its `pyarrow.lib` that [fails loading](https://ci.appveyor.com/project/pitrou/arrow/builds/51137348?fullLog=true#L10128), even though the corresponding DLL `lib.cp310-win_amd64.pyd` [exists](https://ci.appveyor.com/project/pitrou/arrow/builds/51137348?fullLog=true#L10046): ``` ________________________ ERROR collecting test session ________________________ C:\Miniconda38-x64\envs\arrow\lib\importlib\__init__.py:126: in import_module return _bootstrap._gcd_import(name[level:], package, level) <frozen importlib._bootstrap>:1050: in _gcd_import ??? <frozen importlib._bootstrap>:1027: in _find_and_load ??? <frozen importlib._bootstrap>:992: in _find_and_load_unlocked ??? <frozen importlib._bootstrap>:241: in _call_with_frames_removed ??? <frozen importlib._bootstrap>:1050: in _gcd_import ??? <frozen importlib._bootstrap>:1027: in _find_and_load ??? <frozen importlib._bootstrap>:1006: in _find_and_load_unlocked ??? <frozen importlib._bootstrap>:688: in _load_unlocked ??? <frozen importlib._bootstrap_external>:883: in exec_module ??? <frozen importlib._bootstrap>:241: in _call_with_frames_removed ??? C:\Miniconda38-x64\envs\arrow\lib\site-packages\pyarrow\__init__.py:65: in <module> import pyarrow.lib as _lib E ImportError: DLL load failed while importing lib: The specified module could not be found. ``` When one compares a [successful build from 4 days before](https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/51120420?fullLog=true) and a [failing build](https://ci.appveyor.com/project/pitrou/arrow/builds/51141767?fullLog=true#L7524), the only relevant differences seem to be a CMake version bump and a NumPy version bump. However, neither [downgrading NumPy](https://ci.appveyor.com/project/pitrou/arrow/builds/51142269) nor [downgrading CMake](https://ci.appveyor.com/project/pitrou/arrow/builds/51142757) fixes the problem. No change in the source tree seems like it could have caused the issue. (I also tried [downgrading LZ4](https://ci.appveyor.com/project/pitrou/arrow/builds/51141234?fullLog=true), which also failed) ### Component(s) Continuous Integration, Python -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@arrow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
