On fre, 2010-11-12 at 09:44 -0500, Tom Lane wrote:
> But I'm still not convinced that this feature is useful enough to
> justify the implementation effort. AFAICS there's nothing here that
> you couldn't get with some non-default operators on regular arrays,
Unique constraints would behave differently for arrays and multisets.
But I suppose you could get something similar with exclusion constraints
nowadays. But not for primary keys.
Foreign keys also don't work easily with nondefault operators.
JOIN / USING doesn't work.
ORDER BY would work but look ugly. And such coding where you'd have to
remember the nondefault operator everywhere would also be error prone.