jorisvandenbossche commented on PR #49912:
URL: https://github.com/apache/arrow/pull/49912#issuecomment-4387539464
@raulcd it does not yet happen on import, but on first usage that checks
input for being a pyarrow array, such as `pd.DataFrame({"col": [1, 2, 3]})`
Essentially, I think this boils down to python imports in cython working a
bit differently. In pure python, `import pyarrow` raises a ModuleNotFoundError
if you set the module to None in `sys.modules`. But in cython, it actually
"finds" the module (it doesn't raise an error) but sets variable for the
imported module to None (i.e. the value that is set in `sys.modules`).
We could specifically check for that case on the pandas side, although that
feels a bit of a hack. We could also move that try/except to python code, so it
works more as expected.
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