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PERF: Avoid internal copies in Index.__new__ #63438

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mroeschke merged 1 commit into from
Dec 20, 2025
+2 −2
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PERF: Avoid internal copies in Index.__new__ #63438

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2 changes: 1 addition & 1 deletion pandas/core/indexes/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5422,7 +5422,7 @@ def _concat(self, to_concat: list[Index], name: Hashable) -> Index:

result = concat_compat(to_concat_vals)

return Index._with_infer(result, name=name)
return Index._with_infer(result, name=name, copy=False)

def putmask(self, mask, value) -> Index:
"""
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2 changes: 1 addition & 1 deletion pandas/core/indexes/range.py
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Expand Up @@ -1246,7 +1246,7 @@ def _concat(self, indexes: list[Index], name: Hashable) -> Index:
)
else:
values = np.concatenate([x._values for x in rng_indexes])
result = self._constructor(values)
result = self._constructor(values, copy=False)
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@jorisvandenbossche jorisvandenbossche Dec 20, 2025

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there is a similar self._constructor(values) call a few lines above at 1234, where you can add a copy=False as well, I think

return result.rename(name)

if step is not None:
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