The +1 Pole trying to hold the Death Star trash compactor open would either be shoved aside, or a poke a Pole-sized hole in one side of the compactor. Unless this activity destroys the compactor, the people inside are squashed in either case.
I doubt a normal weapon would break from a simple fall, unless it was something extreme like 200 feet. I'd say anything below 40' would be subdual damage to an item that size, and objects are immune to subdual damage. Certainly a magical weapon wouldn't. If that DM really wanted to destroy magical weapons, he really should have bum-rushed you with 100 Rust Monsters like any respectable DM would!