| From: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
|---|---|
| To: | Simon Riggs <simon(dot)riggs(at)enterprisedb(dot)com> |
| Cc: | Justin Pryzby <pryzby(at)telsasoft(dot)com>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Japin Li <japinli(at)hotmail(dot)com>, Zhihong Yu <zyu(at)yugabyte(dot)com>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Daniel Westermann <dwe(at)dbi-services(dot)com>, Erik Rijkers <er(at)xs4all(dot)nl>, Jaime Casanova <jcasanov(at)systemguards(dot)com(dot)ec>, Andres Freund <andres(at)anarazel(dot)de> |
| Subject: | Re: MERGE and parsing with prepared statements |
| Date: | 2022-08-12 11:53:25 |
| Message-ID: | 20220812115325.5b4xuvrqr66wvixp@alvherre.pgsql |
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| Lists: | pgsql-hackers |
On 2022-Aug-12, Simon Riggs wrote:
> Sorry, but I disagree with this chunk in the latest commit,
> specifically, changing the MATCHED from after to before the NOT
> MATCHED clause.
>
> The whole point of the second example was to demonstrate that the
> order of the MATCHED/NOT MATCHED clauses made no difference.
>
> By changing the examples so they are the same, the sentence at line
> 573 now makes no sense.
Hmm, I thought the point of the example was to show that you can replace
the table in the USING clause with a query that retrieves the column;
but you're right, we lost the thing there. Maybe it was too subtle to
the point that I failed to understand it. Perhaps we can put it back
the way it was and explain these two differences (change of data source
*and* clause ordering) more explicitly.
--
Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/
"La virtud es el justo medio entre dos defectos" (Aristóteles)
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