remove interpolate changes

Author: jorisvandenbossche

pandas/core/arrays/arrow/array.py

@@ -2160,9 +2160,7 @@ def interpolate(
         """
         # NB: we return type(self) even if copy=False
         if not self.dtype._is_numeric:
-            raise NotImplementedError(
-                f"interpolate is not implemented for dtype={self.dtype}"
-            )
+            raise ValueError("Values must be numeric.")
 
         if (
             not pa_version_under13p0

pandas/tests/extension/test_arrow.py

@@ -3451,7 +3451,7 @@ def test_string_to_datetime_parsing_cast():
 )
 def test_interpolate_not_numeric(data):
     if not data.dtype._is_numeric:
-        with pytest.raises(NotImplementedError, match="interpolate is not implemented"):
+        with pytest.raises(ValueError, match="Values must be numeric."):
             pd.Series(data).interpolate()
 
 

pandas/tests/frame/methods/test_interpolate.py

@@ -64,6 +64,7 @@ def test_interpolate_inplace(self, frame_or_series, request):
         assert np.shares_memory(orig, obj.values)
         assert orig.squeeze()[1] == 1.5
 
+    # TODO(infer_string) raise proper TypeError in case of string dtype
     @pytest.mark.xfail(
         using_string_dtype(), reason="interpolate doesn't work for string"
     )