From: Doug Quale <quale1@charter.net>
To: pgsql-general@postgresql.org
Subject: Re: [pgsql-advocacy] Oracle buys Innobase
Date: Thu, 20 Oct 2005 15:29:22 -0500
Message-ID: <878xwokk4d.fsf@charter.net> (raw)
In-Reply-To: <CC1CF380F4D70844B01D45982E671B239E8BEC@mtxexch01.add0.masergy.com>
References: <CC1CF380F4D70844B01D45982E671B239E8BEC@mtxexch01.add0.masergy.com>
"Guy Rouillier" <guyr@masergy.com> writes:
> Doug Quale wrote:
>>
>> # select 'a'::char(8) = 'a '::char(8);
>> ?column?
>> ----------
>> t
>> (1 row)
>>
>> Trailing blanks aren't significant in fixed-length strings, so the
>> question is whether Postgresql treats comparison of varchars right.
>
> This result is being misinterpreted.
>
> select length('a'::char(8)) ==> 1
> select length('a '::char(8)) ==> 1
>
> So it isn't that the two different strings are comparing equal. The
> process of casting them to char(8) is trimming the blanks, so by the
> time they become fixed length strings, they are indeed equal.
Huh??? What version of PG are you using? On 7.4.9,
test=# select length('a'::char(8));
length
--------
8
(1 row)
test=# select length('a '::char(8));
length
--------
8
(1 row)
The truncation you describe would simply be wrong.
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To: pgsql-sql@postgresql.org
Cc: quale1@charter.net, pgsql-general@postgresql.org
Subject: Re: [pgsql-advocacy] Oracle buys Innobase
In-Reply-To: <878xwokk4d.fsf@charter.net>
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