domoritz opened a new issue, #33823:
URL: https://github.com/apache/arrow/issues/33823
### Describe the bug, including details regarding any error messages,
version, and platform.
I am trying to loan an arrow file
```python
with pa.memory_map('flights-200k.arrow', 'r') as source:
my_arrow = pa.ipc.open_file(source).read_all()
```
but get this error
```
File
"/opt/homebrew/Caskroom/miniforge/base/envs/ramsch/lib/python3.10/site-packages/pyarrow/ipc.py",
line 228, in open_file
return RecordBatchFileReader(
File
"/opt/homebrew/Caskroom/miniforge/base/envs/ramsch/lib/python3.10/site-packages/pyarrow/ipc.py",
line 110, in __init__
self._open(source, footer_offset=footer_offset,
File "pyarrow/ipc.pxi", line 862, in
pyarrow.lib._RecordBatchFileReader._open
File "pyarrow/error.pxi", line 144, in
pyarrow.lib.pyarrow_internal_check_status
File "pyarrow/error.pxi", line 100, in pyarrow.lib.check_status
pyarrow.lib.ArrowInvalid: Not an Arrow file
```
The arrow file is
https://github.com/uwdata/flights-arrow/blob/master/flights-200k.arrow and
loads fine in the arrow js library.
### Component(s)
Python
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