cast pyarrow

Author: andrewgsavage

pandas/core/arrays/arrow/array.py

@@ -1096,7 +1096,8 @@ def round(self, decimals: int = 0, *args, **kwargs) -> Self:
         """
         if not self.dtype._is_numeric or self.dtype._is_boolean:
             raise TypeError("Cannot round non-numeric type.")
-        return type(self)(pc.round(self._pa_array, ndigits=decimals))
+        result = pc.round(self._pa_array, ndigits=decimals)
+        return type(self)(result.cast(self._pa_array.type))
 
     @doc(ExtensionArray.searchsorted)
     def searchsorted(