> > Never, unless you drop and recreate the table. Removing a dropped > column would change the attnums of following columns, which we > can't support because the tableoid+attnum is the only persistent > identifier of a column. > > (From memory, operations like VACUUM FULL and CLUSTER will rewrite > dropped columns with NULLs to reduce their storage impact. But they > don't go away.) > > Thank you. I remember reading it here that VACUUM FULL does what you describe above. So even TRUNCATE does not help here?
