Numpydev CI Failures

[WillAyd]

It looks like some .intersection tests are failing. AFAICT this traces back to here:

pandas/pandas/_libs/lib.pyx

Line 685 in bdcc5bf

return np.asarray(obj, dtype='int64'), 0

Which on numpy dev during test execution isn't raising an OverflowError and instead performs a wraparound. Interestingly enough, running:

np.asarray([2 ** 63, 2**63 + 1], dtype="int64") 

With numpydev does overflow in the Python space, so perhaps a Cython issue?

[simonjayhawkins]

The current test failures on master are

=========================== short test summary info ============================
FAILED pandas/tests/indexes/test_base.py::TestIndex::test_intersection_base[uint]
FAILED pandas/tests/indexes/test_numeric.py::TestUInt64Index::test_intersection_base[index_inc]
FAILED pandas/tests/indexes/test_numeric.py::TestUInt64Index::test_intersection_base[index_dec]
FAILED pandas/tests/indexing/test_loc.py::TestLoc2::test_loc_setitem_empty_append_raises
=== 4 failed, 70016 passed, 4046 skipped, 1018 xfailed in 464.33s (0:07:44) ====

[WillAyd]

I think the problem for most of these is the Cython version; looks like numpy bumped their minimum Cython version to 0.29.21 but we are still pinned to 0.29.16 on this environment.

numpy/numpy@fc9d862

[WillAyd]

Hmm so maybe the version isn't it. When bissecting numpy I stopped between 86fcce6 and fc9d862 so one other possible culprit is numpy/numpy#16200

[WillAyd]

OK after I bisect I am fairly certain the failures here trace back to numpy/numpy#16200 .

@seberg not sure if you have any idea on the OP

[bashtage]

Candidate fix in #35485