Re: bogus error message for ALTER TABLE ALTER CONSTRAINT

Hello,

I fleshed this out more fully and I think 0001 is good enough to commit.

I then noticed that constraints on domains are giving bogus error
messages as well, and the situation is easily improved -- see 0002.  I'm
not so sure about this one, mainly because test coverage appears scant.
I need to look into this one a bit more.

Thanks

-- 
Álvaro Herrera         PostgreSQL Developer  —  https://www.EnterpriseDB.com/