Jeff Hoffmann <jeff@xxxxxxxxxxxxxxx> writes: > I am using postgresql-12.8. I am using I am making use of an identity > column for part of a scripts to process some updated data. Because of > the way the script is called I don't necessarily know if this column > is going to exist in the table I am working on so I have a step that > will conditionally create the column if it doesn't already exist, i.e. > alter table mytable add column if not exists unique_id integer > generated always as identity; You're right, this sort of thing does not work very well in v12 and before. We fixed it in v13, but the changes seemed far too invasive to risk a back-patch [1]. regards, tom lane [1] https://git.postgresql.org/gitweb/?p=postgresql.git&a=commitdiff&h=1281a5c90
