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Backport PR #52054 on branch 2.0.x (PERF: Improve performance with copy=True and different dtype) #52088

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Merged
merged 1 commit into from
Mar 20, 2023
Merged

Backport PR #52054 on branch 2.0.x (PERF: Improve performance with copy=True and different dtype) #52088

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8 changes: 7 additions & 1 deletion pandas/core/internals/construction.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
npt,
)

from pandas.core.dtypes.astype import astype_is_view
from pandas.core.dtypes.cast import (
construct_1d_arraylike_from_scalar,
dict_compat,
Expand Down Expand Up @@ -291,7 +292,12 @@ def ndarray_to_mgr(

elif isinstance(values, (np.ndarray, ExtensionArray, ABCSeries, Index)):
# drop subclass info
values = np.array(values, copy=copy_on_sanitize)
_copy = (
copy_on_sanitize
if (dtype is None or astype_is_view(values.dtype, dtype))
else False
)
values = np.array(values, copy=_copy)
values = _ensure_2d(values)

else:
Expand Down