jameslamb opened a new issue, #49831:
URL: https://github.com/apache/arrow/issues/49831
### Describe the bug, including details regarding any error messages,
version, and platform.
Consider the following snippet:
```shell
docker run \
--rm \
-it python:3.13 \
bash
pip install 'pyarrow>=24.0' 'mypy'
cat > test.py <<EOF
import pyarrow as pa
import pyarrow.compute as pa_compute
def all_ones(arr) -> bool:
return pa_compute.all(pa_compute.equal(arr, 1))
if __name__ == "__main__":
X = pa.array([1, 1, 1])
print(f"all ones?: {all_ones(X)}")
EOF
```
This is totally plausible `pyarrow` code and works as expected.
```console
$ python ./test.py
all ones?: True
```
But `mypy` complains about it referencing things that don't exist in
`pyarrow`
```console
$ mypy --version
mypy 1.20.2 (compiled: yes)
$ mypy ./test.py
test.py:5: error: Module has no attribute "all" [attr-defined]
test.py:5: error: Module has no attribute "equal" [attr-defined]
Found 2 errors in 1 file (checked 1 source file)
```
## Notes
Similar errors are not surfaced by type checkers like `mypy` on
`pyarrow<24`, so I strongly suspect this is related to something new in the
24.0 release. Possibly the introduction of type-checking infrastructure (a
`py.typed` file and `.pyi` stubs), around #48618
Maybe the `.pyi` stub file(s) are incomplete? At
https://mypy.readthedocs.io/en/stable/stubs.html#creating-a-stub, I see:
> _If a directory contains both a `.py` and a `.pyi` file for the same
module, the `.pyi` file takes precedence._
Or maybe `mypy` does not handle well situations where things are added to
`globals` at import time like this?
https://github.com/apache/arrow/blob/acd8e442939b5fbf90d0cd65ca506514ec3851c4/python/pyarrow/compute.py#L343
Thanks for your time and consideration.
### Component(s)
Python
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