ALTER DOMAIN missing from topology_upgrade

[strk]

I just noticed that the ALTER DOMAIN statements in topology.sql.in (meant to do upgrades) are not being present in the topology_upgrade.sql script, meaning domain constraints are not properly upgraded.

Changing to an enhancement request.

[strk]

I see ALTER lines are explicitly removed from the SQL file for the purpose of creating the upgrade script, but dont' understand why. Digging back in history I found r8157 being the commit that introduced the rule to create the upgrade script, by Regina in November 2011.

Regina, where did you copy that from ? Why an ALTER is also condidered something that cannot be present in an upgrade ? The comment above that snippet says:

+#Generate upgrade script by stripping things that can't be reinstalled
+#e.g. don't bother with tables, types, triggers, and domains

[strk]

Ok one reason to strip the ALTER is that some of the ALTERs in there are for adding constraints, and fail if the constraint already exists. I guess the topology script could be changed to account for that, or otherwise it would be impossible for an upgrade to add or drop a constraint…

DROP .. IF EXISTS .. is only available starting with PostgreSQL 9.2 though

[strk]

I guess it is time to generate the topology upgrade via our postgis_proc_upgrade.pl, and add there logic to handle changes in constraints set attached to domains.