What would happen if a large body were to crash into the sun?

If a large body, e.g. an icy comet, a metallic comet, a planetary body were to fall into the sun, what would happen? Would the body actually impact the sun's surface? Or, would the photosphere vaporize any matter before it lands? Are the molecules blown into the solar system as solar wind or does gravity pull them back in? How would the composition of the impacting body effect the final outcome? I.e. a metallic body vs rocky vs icy? Are these molecular meteors observable on earth? Or are they too heavily ionized?