Fix broken ArrowStringArray tests

Author: jbrockmendel

pandas/core/arrays/arrow/array.py

@@ -832,7 +832,10 @@ def __arrow_array__(self, type=None):
     def __array_ufunc__(self, ufunc: np.ufunc, method: str, *inputs, **kwargs):
         # Need to wrap np.array results GH#62800
         result = super().__array_ufunc__(ufunc, method, *inputs, **kwargs)
-        return type(self)._from_sequence(result)
+        if type(self) is ArrowExtensionArray:
+            # Exclude ArrowStringArray
+            return type(self)._from_sequence(result)
+        return result
 
     def __array__(
         self, dtype: NpDtype | None = None, copy: bool | None = None

pandas/tests/series/test_npfuncs.py

@@ -43,7 +43,7 @@ def test_log_arrow_backed_missing_value(using_nan_is_na):
     ser = Series([1, 2, None], dtype="float64[pyarrow]")
     if using_nan_is_na:
         result = np.log(ser)
-        expected = np.log(Series([1, 2, None], dtype="float64"))
+        expected = np.log(Series([1, 2, None], dtype="float64[pyarrow]"))
         tm.assert_series_equal(result, expected)
     else:
         # we get cast to object which raises