From: Eugen Konkov <kes-kes@yandex.ru>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-docs@lists.postgresql.org
Subject: Re: DOC not so clear
Date: Tue, 15 Jan 2019 08:37:37 +0200
Message-ID: <1382435334.20190115083737@yandex.ru> (raw)
In-Reply-To: <25974.1547482531@sss.pgh.pa.us>
References: <154747695538.22759.12913505368136831904@wrigleys.postgresql.org>
<25974.1547482531@sss.pgh.pa.us>
Hello Tom,
Monday, January 14, 2019, 6:15:31 PM, you wrote:
> =?utf-8?q?PG_Doc_comments_form?= <noreply@postgresql.org> writes:
>> https://www.postgresql.org/docs/current/queries-table-expressions.html#QUERIES-LATERAL>>> The resulting row(s) are joined as usual with the rows they were computed
>>> from.
>> Here is not so clear what 'joined as usual' mean.
> Why not?
Advanced users may understand that, but from my beginner point of view
this is not. I do not understand that sentence until read whole text
and about LEFT JOIN LATERAL. Even now 'usual' may mean:
CROSS/RIGHT/FULL??
>> Probably DOC should explicitly say that if LATERAL function return empty set
>> then current row is excluded from result set
> That would be wrong for "LEFT JOIN LATERAL ...", so it does not seem
> like an improvement.
LATERAL != LEFT JOIN LATERAL
it would be more clear if DOC will be more explicit.
> regards, tom lane
--
Best regards,
Eugen Konkov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-docs@postgresql.org
Cc: kes-kes@yandex.ru, tgl@sss.pgh.pa.us, pgsql-docs@lists.postgresql.org
Subject: Re: DOC not so clear
In-Reply-To: <1382435334.20190115083737@yandex.ru>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox