Re: Short-circuit boolean evaluation

Поиск
Список
Период
Сортировка
От David Johnston
Тема Re: Short-circuit boolean evaluation
Дата
Msg-id 171423D4-9229-4D56-B06B-58D29BB50A77@yahoo.com
обсуждение исходный текст
Ответ на Re: Short-circuit boolean evaluation  (pasman pasmański <pasman.p@gmail.com>)
Ответы Re: Short-circuit boolean evaluation  (Martijn van Oosterhout <kleptog@svana.org>)
Re: Short-circuit boolean evaluation  (Tom Lane <tgl@sss.pgh.pa.us>)
Список pgsql-general
No. It will not be called
Or
No. Postgresql does not short-circuit boolean evaluations
?

On Apr 30, 2011, at 10:27, pasman pasmański <pasman.p@gmail.com> wrote:

No.

2011/4/30, Jon Smark <jon.smark@yahoo.com>:
Hi,

Does Postgresql perform short-circuit boolean evaluation both in SQL
and PL/pgSQL functions?  As an example, suppose I have a function called
"do_stuff" which is computationally intensive.  In the example below,
will it be called for rows for which the first predicate (foobar.id = $1)
is false?

SELECT count(*) FROM foobar WHERE foobar.id = $1 AND do_stuff (foobar.name);

Thanks!
Jon


--
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general



--
------------
pasman

--
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general

В списке pgsql-general по дате отправления:

Предыдущее
От: pasman pasmański
Дата:
Сообщение: Re: Short-circuit boolean evaluation
Следующее
От: Martijn van Oosterhout
Дата:
Сообщение: Re: Short-circuit boolean evaluation