| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, 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: | 2018-04-03 03:18:26 |
| Message-ID: | CAH2-WznOuc=7_zSySetM8=r95t7Kx7-Y7QNF00Xb+GEWZaO2ZA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Apr 2, 2018 at 8:11 PM, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com> wrote:
> Honestly I don't think Peter ever raised concerns about the join, though I
> could be missing early discussions when I wasn't paying attention. It's
> there from day 1. Peter raised concerns about the two RTE stuff which was
> necessitated when we added support for partitioned table. We discussed that
> at some length, with your inputs and agreed that it's not necessarily a bad
> thing and probably the only way to deal with partitioned tables.
>
> Personally, I don't see why an internal join is bad. That's what MERGE is
> doing anyways, so it closely matches with the overall procedure.
The issue is not that there is a join as such. It's how it's
represented in the parser, and how that affects other things. There is
a lot of special case logic to make it work.
--
Peter Geoghegan
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