Re: MERGE ... RETURNING - Mailing list pgsql-hackers

From Jeff Davis
Subject Re: MERGE ... RETURNING
Date
Msg-id 59d331e5f147256977c9af174dfc219e5a9139a2.camel@j-davis.com
Whole thread Raw
In response to Re: MERGE ... RETURNING  (Dean Rasheed <dean.a.rasheed@gmail.com>)
List pgsql-hackers
On Mon, 2023-01-09 at 12:29 +0000, Dean Rasheed wrote:
> > Would it be useful to have just the action? Perhaps "WITH ACTION"?
> > My idea is that this would return an enum of INSERT, UPDATE, DELETE
> > (so is "action" the right word?). It seems to me in many situations
> > I would be more likely to care about which of these 3 happened
> > rather than the exact clause that applied. This isn't necessarily
> > meant to be instead of your suggestion because I can imagine
> > wanting to know the exact clause, just an alternative that might
> > suffice in many situations. Using it would also avoid problems
> > arising from editing the query in a way which changes the numbers
> > of the clauses.
> >
>
> Hmm, perhaps that's something that can be added as well. Both use
> cases seem useful.

Can you expand a bit on the use cases for identifying individual WHEN
clauses? I see that it offers a new capability beyond just the action
type, but I'm having trouble thinking of real use cases.

Regards,
    Jeff Davis




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