Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> On 2019-Jan-10, Jesper Pedersen wrote:
>> However, when you use ADD CONSTRAINT FOREIGN KEY you can't use ONLY, so
>> would it be a good idea to make ADD CONSTRAINT UNIQUE behave the same way,
>> i.e. error out ?
> I haven't investigated this angle. It seems more complex than just a
> simple bugfix, right?
Wouldn't that be throwing away the entire point of the ONLY behavior,
ie to allow the component indexes to be built one at a time, without
holding locks across the whole partition tree?
I'm having a hard time getting from "ONLY confuses me" to "nobody
should be allowed to do this". I think there is a documentation
and UX issue here, but I don't see that there's anything wrong
with the functionality.
regards, tom lane
