Re: cleanup temporary files after crash

Well, that's better, bit it still does not do the trick on the 32-bit

machine - in that case a 1000 rows with int4 still fit into work_mem, so

the temp file is not created. Per my experiments about 1040 rows are

needed - soooo close ;-) So let's make it 2000.

We might as well check that the temp file actually exists, before

killing the backend. Just to be sure.