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Backport PR #53672 on branch 2.0.x (BUG/CoW: is_range_indexer can't handle very large arrays) #53691

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Merged
merged 1 commit into from
Jun 15, 2023
Merged

Backport PR #53672 on branch 2.0.x (BUG/CoW: is_range_indexer can't handle very large arrays) #53691

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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v2.0.3.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ Bug fixes
- Bug in :func:`RangeIndex.union` when using ``sort=True`` with another :class:`RangeIndex` (:issue:`53490`)
- Bug in :func:`read_csv` when defining ``dtype`` with ``bool[pyarrow]`` for the ``"c"`` and ``"python"`` engines (:issue:`53390`)
- Bug in :meth:`Series.str.split` and :meth:`Series.str.rsplit` with ``expand=True`` for :class:`ArrowDtype` with ``pyarrow.string`` (:issue:`53532`)
-
- Bug in indexing methods (e.g. :meth:`DataFrame.__getitem__`) where taking the entire :class:`DataFrame`/:class:`Series` would raise an ``OverflowError`` when Copy on Write was enabled and the length of the array was over the maximum size a 32-bit integer can hold (:issue:`53616`)

.. ---------------------------------------------------------------------------
.. _whatsnew_203.other:
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2 changes: 1 addition & 1 deletion pandas/_libs/lib.pyx
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Expand Up @@ -651,7 +651,7 @@ ctypedef fused int6432_t:

@cython.wraparound(False)
@cython.boundscheck(False)
def is_range_indexer(ndarray[int6432_t, ndim=1] left, int n) -> bool:
def is_range_indexer(ndarray[int6432_t, ndim=1] left, Py_ssize_t n) -> bool:
"""
Perform an element by element comparison on 1-d integer arrays, meant for indexer
comparisons
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13 changes: 13 additions & 0 deletions pandas/tests/libs/test_lib.py
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Expand Up @@ -6,6 +6,7 @@
lib,
writers as libwriters,
)
from pandas.compat import IS64

from pandas import Index
import pandas._testing as tm
Expand Down Expand Up @@ -248,6 +249,18 @@ def test_is_range_indexer(self, dtype):
left = np.arange(0, 100, dtype=dtype)
assert lib.is_range_indexer(left, 100)

@pytest.mark.skipif(
not IS64,
reason="2**31 is too big for Py_ssize_t on 32-bit. "
"It doesn't matter though since you cannot create an array that long on 32-bit",
)
@pytest.mark.parametrize("dtype", ["int64", "int32"])
def test_is_range_indexer_big_n(self, dtype):
# GH53616
left = np.arange(0, 100, dtype=dtype)

assert not lib.is_range_indexer(left, 2**31)

@pytest.mark.parametrize("dtype", ["int64", "int32"])
def test_is_range_indexer_not_equal(self, dtype):
# GH#50592
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