FEAT-modin-project#7207: Add the ability to assing a df to a columns …

…selection without d2p

Signed-off-by: Igoshev, Iaroslav <[email protected]>

modin/pandas/dataframe.py

@@ -2671,7 +2671,9 @@ def __setitem__(self, key, value) -> None:
                     key = self.__constructor__(key, columns=self.columns)
                 return self.mask(key, value, inplace=True)
 
-            if isinstance(key, list) and all((x in self.columns for x in key)):
+            if isinstance(key, (list, pandas.Index)) and all(
+                (x in self.columns for x in key)
+            ):
                 if is_list_like(value):
                     if not (hasattr(value, "shape") and hasattr(value, "ndim")):
                         value = np.array(value)