Re: INSERT ... ON CONFLICT UPDATE and RLS - Mailing list pgsql-hackers

From David Fetter
Subject Re: INSERT ... ON CONFLICT UPDATE and RLS
Date
Msg-id 20150108011631.GA13548@fetter.org
Whole thread Raw
In response to Re: INSERT ... ON CONFLICT UPDATE and RLS  (Stephen Frost <sfrost@snowman.net>)
Responses Re: INSERT ... ON CONFLICT UPDATE and RLS
List pgsql-hackers
On Wed, Jan 07, 2015 at 03:01:20PM -0500, Stephen Frost wrote:
> * Robert Haas (robertmhaas@gmail.com) wrote:
> > On Wed, Jan 7, 2015 at 4:04 AM, Dean Rasheed <dean.a.rasheed@gmail.com> wrote:
> > > I think the policies applied should depend on the path taken, so if it
> > > does an INSERT, then only the INSERT CHECK policy should be applied
> > > (after the insert), but if it ends up doing an UPDATE, I would expect
> > > the UPDATE USING policy to be applied (before the update) and the
> > > UPDATE CHECK policy to be applied (after the update). I would not
> > > expect the INSERT CHECK policy to be applied on the UPDATE path.
> > 
> > I agree.
> 
> I can certainly understand the appeal of this approach, but I don't
> think it makes sense.  Consider what happens later on down the road,
> after the code has been written and deployed using INSERT .. ON CONFLICT
> UPDATE where 99% of the time only one path or the other is taken.  Then
> the other path is taken and suddenly the exact same command and row ends
> up returning errors.  Additional testing should have been done to check
> if that happens, of course, but I really don't like the idea that the
> exact same command, with the exact same policies, would succeed or fail,
> due to policies, based on the data in the database.

There's precedent.  Unique constraints, for example.

Cheers,
David.
-- 
David Fetter <david@fetter.org> http://fetter.org/
Phone: +1 415 235 3778  AIM: dfetter666  Yahoo!: dfetter
Skype: davidfetter      XMPP: david.fetter@gmail.com

Remember to vote!
Consider donating to Postgres: http://www.postgresql.org/about/donate



pgsql-hackers by date:

Previous
From: Marko Tiikkaja
Date:
Subject: Re: empty select list allowed when using function as table
Next
From: Peter Geoghegan
Date:
Subject: Re: INSERT ... ON CONFLICT UPDATE and RLS