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Fix pivot_table duplicate indices with Python 3.14 + NumPy 1.26 #63324

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Fix pivot_table duplicate indices with Python 3.14 + NumPy 1.26 #63324

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5e92681
fix pivot_table duplicates on py3.14 with old numpy
AKHIL-149 Dec 11, 2025
246ffec
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Dec 11, 2025
af06a77
use pandas compat constants for version checks
AKHIL-149 Dec 12, 2025
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10 changes: 9 additions & 1 deletion pandas/core/reshape/reshape.py
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Original file line number Diff line number Diff line change
Expand Up @@ -234,7 +234,15 @@ def _make_selectors(self) -> None:
self.group_index = comp_index
self.mask = mask
if self.sort:
self.compressor = comp_index.searchsorted(np.arange(ngroups))
from pandas.compat import PY314
from pandas.compat.numpy import np_version_gt2

# GH 63314: avoid searchsorted bug with py3.14 + numpy < 2.0
if PY314 and not np_version_gt2:
# use manual approach instead of buggy searchsorted
self.compressor = np.sort(np.unique(comp_index, return_index=True)[1])
else:
self.compressor = comp_index.searchsorted(np.arange(ngroups))
else:
self.compressor = np.sort(np.unique(comp_index, return_index=True)[1])

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