A sufficiently slender column will fail under compression below yield stress by bowing, releasing it's axial elastic strain. This is called buckling. Depending on the slenderness of the column, the buckling may be fully elastic, or may involve some plastic deformation powered by the released elastic strain energy. If the column is too stubby, it will not buckle at all before reaching the yield stress.
One such column, which is ductile, yields in compression. What is the expected ultimate failure mode? Is it a fully plastic version of buckling, or something else?