I have a simple table with a given column defined like so:
common_key| integer | | not null | nextval('alias.identity_common_key_seq'::regclass)| plain
Very very very infrequently, on an INSERT where this column is not specified, this column will be assigned a value that already exists in the table, versus the next presumably unused value in the sequence. I cannot figure this out. Is there any reason why this might be the case?