On 23 August 2010 10:35, Andrew Dunstan <and...@dunslane.net> wrote: > > Attached is a WIP patch that allows enums to be extended with additional > labels arbitrarily. As previously discussed, it works by adding an explicit > sort order column to pg_enum. It keeps track of whether the labels are > correctly sorted by oid value, and if so uses that for comparison, so the > possible performance impact on existing uses, and on almost all cases where > a label is added at the end of the list, should be negligible. > > Open items include > > * some additional error checking required > * missing documentation > * pg_upgrade considerations > > > To add a label at the end of the list, do: > > ALTER TYPE myenum ADD 'newlabel'; > > To add a label somewhere else, do: > > ALTER TYPE myenum ADD 'newlabel' BEFORE 'existinglabel'; > > or > > ALTER TYPE myenum ADD 'newlabel' AFTER 'existinglabel'; > > > I'm not wedded to the syntax. Let the bikeshedding begin. > > cheers > > andrew
When you write the supporting doc changes, you might want to add a note in to mention that you cannot remove a label once it has been added. Will the modified enums remain intact after a dump/restore? -- Thom Brown Registered Linux user: #516935 -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
