| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Peter Geoghegan <pg(at)bowt(dot)ie> |
| Cc: | Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Pavan Deolasee <pavan(dot)deolasee(at)2ndquadrant(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] MERGE SQL Statement for PG11 |
| Date: | 2018-02-28 16:53:56 |
| Message-ID: | CA+TgmoaYfLUO5-E0TGX7CVY2MASk1ECVXP4BW7mLC=-PvdC1Xw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Feb 27, 2018 at 5:07 PM, Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
> I now feel like Simon's suggestion of throwing an error in corner
> cases isn't so bad. It still seems like we could do better, but the
> more I think about it, the less that seems like a cop-out. My reasons
> are:
I still think we really ought to try not to add a new class of error.
> * We can all agree that *not* raising an error in the specific way
> Simon proposes is possible, somehow or other. We also all agree that
> avoiding the broader category of RC errors can only be taken so far
> (e.g. in any event duplicate violations errors are entirely possible,
> in RC mode, when a MERGE inserts a row). So this is a question of what
> exact middle ground to take. Neither of the two extremes (throwing an
> error on the first sign of a RC conflict, and magically preventing
> concurrency anomalies) are actually on the table.
Just because there's no certainty about which behavior is best doesn't
mean that none of them are better than throwing an error.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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