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PERF: Restore old performances with .isin() on columns typed as np.ui… #61320

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PERF: Restore old performances with .isin() on columns typed as np.ui… #61320

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PERF: Restore old performances with .isin() on columns typed as np.ui…
pbrochart Apr 20, 2025
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[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Apr 20, 2025
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2 changes: 2 additions & 0 deletions pandas/core/algorithms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,7 @@
is_bool_dtype,
is_complex_dtype,
is_dict_like,
is_dtype_equal,
is_extension_array_dtype,
is_float,
is_float_dtype,
Expand Down Expand Up @@ -511,6 +512,7 @@ def isin(comps: ListLike, values: ListLike) -> npt.NDArray[np.bool_]:
len(values) > 0
and values.dtype.kind in "iufcb"
and not is_signed_integer_dtype(comps)
and not is_dtype_equal(values, comps)
):
# GH#46485 Use object to avoid upcast to float64 later
# TODO: Share with _find_common_type_compat
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