Hi, On 2018-02-12 09:54:29 +1030, Andrew Dunstan wrote: > The idea is to have an append-only list of labels > which would not obey transactional semantics, and would thus help us > avoid the pitfalls of enums - there wouldn't be any rollback of an > addition.
FWIW, I think we can resolve the issues of enum transactionality. While not trivial I think the solution is to allow to make additions of enum values non-transactional (by basically inserting them with immediate visibility) *while* in a transaction, and to change deletion of values to set a 'deleted' column to true. With some additional effort we could even make additions transactional by storing the xid that added the enum label along the row. Visibility for index comparisons would regard labels as visible regardless of that xid, but when creating new values we'd make a visibility check. The big issue with that is that autovacuum has to know about it... Greetings, Andres Freund
