| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(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: | 2018-03-27 18:14:58 |
| Message-ID: | CAH2-WzneuBzYSn3ggs7JPAWDBDN8WYDSdwLjBrjL1RjW1+x9Vw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Mar 27, 2018 at 1:15 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> Accepted, the only question is whether it affects UPDATE as well cos
> it looks like it should.
If you mean an UPDATE FROM self-join, then I suppose that it does, in
a very limited way. The difference is that there are no hard-coded
assumptions about the relationship between those two RTEs.
--
Peter Geoghegan
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