Attached patch fixes some issues with ON CONFLICT DO UPDATE/DO
NOTHING. There is a commit message which explains the changes at a
high level. The only real bug fix is around deparsing by ruleutils.c.
Note that the patch proposes to de-support CREATE RULE with an
alternative action involving ON CONFLICT DO UPDATE. Such a rule seems
particularly questionable to me, and I'm pretty sure it was understood
that only ON CONFLICT DO NOTHING should be supported as an action for
a rule (recall that INSERT statements with ON CONFLICT can, in
general, never target relations with rules). At least, I believe
Heikki said that.
Thoughts?
--
Peter Geoghegan
