Re: cleanup temporary files after crash

I think a better way to test this would be to use a tuple lock:

setup:

  create table t (a int unique);

session 1:

  begin;

  insert into t values (1);

  ... keep open ...

session 2:

   begin;

   set work_mem = '64kB';

   insert into t select i from generate_series(1,10000) s(i);

   ... should block ...

Then, once the second session gets waiting on the tuple, kill the

backend. We might as well test that there actually is a temp file first,

and then test that it disappeared.