Re: BUG #6495: mis-sorting on string field consisting of space-padded numbers

Hello

2012/2/28  <lou@paprikash.com>:
> The following bug has been logged on the website:
>
> Bug reference: =C2=A0 =C2=A0 =C2=A06495
> Logged by: =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lou Duchez
> Email address: =C2=A0 =C2=A0 =C2=A0lou@paprikash.com
> PostgreSQL version: 9.1.2
> Operating system: =C2=A0 Fedora 16, CentOS 5
> Description:
>
> Download the following file and feed it into psql:
>
> http://www.paprikash.com/lou/missorttest.sql
>
> Then run the command:
>
> select * from missorttest order by hiercode;
>
> Each "hiercode" entry contains concatenations of numbers, where each numb=
er
> is left-padded to take exactly four characters. =C2=A0PostgreSQL is sorti=
ng as if
> the padding were on the right. =C2=A0As a result, " =C2=A0 2 =C2=A010" is=
 coming before "
> 2 =C2=A0 2", even though a literal sorting of the string should put " =C2=
=A0 2 =C2=A0 2"
> first (because chr 32 comes before chr 49).
>
> More info: this error does not occur on the Windows build of PostgreSQL.
> Also, I compile my own versions of PostgreSQL on Fedora and CentOS, taking
> all the defaults.
>

This should not be bug - this behave depends on system libraries and
locales setting.

Please, check value of lc_collate variable

postgres=3D> show lc_collate;
 lc_collate
-------------
 en_US.UTF-8
(1 row)

different collations should have different order.

Regards

Pavel Stehule

>
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