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[ArrowStringArray] Use utf8_upper and utf8_lower functions from Apache Arrow #41056

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Apr 20, 2021
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[ArrowStringArray] Use utf8_upper and utf8_lower functions from Apache Arrow #41056

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6 changes: 6 additions & 0 deletions pandas/core/arrays/string_arrow.py
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Original file line number Diff line number Diff line change
Expand Up @@ -757,3 +757,9 @@ def _str_map(self, f, na_value=None, dtype: Dtype | None = None):
# or .findall returns a list).
# -> We don't know the result type. E.g. `.get` can return anything.
return lib.map_infer_mask(arr, f, mask.view("uint8"))

def _str_lower(self):
return type(self)(pc.utf8_lower(self._data))

def _str_upper(self):
return type(self)(pc.utf8_upper(self._data))