CLN: remove _igetitem_cache (pandas-dev#32319)

Author: jbrockmendel

pandas/core/frame.py

@@ -2741,7 +2741,7 @@ def _set_value(self, index, col, value, takeable: bool = False):
         """
         try:
             if takeable is True:
-                series = self._iget_item_cache(col)
+                series = self._ixs(col, axis=1)
                 series._set_value(index, value, takeable=True)
                 return
 

pandas/core/generic.py

@@ -3463,15 +3463,6 @@ def _get_item_cache(self, item):
             res._is_copy = self._is_copy
         return res
 
-    def _iget_item_cache(self, item: int):
-        """Return the cached item, item represents a positional indexer."""
-        ax = self._info_axis
-        if ax.is_unique:
-            lower = self._get_item_cache(ax[item])
-        else:
-            return self._ixs(item, axis=1)
-        return lower
-
     def _box_item_values(self, key, values):
         raise AbstractMethodError(self)