Re: 'AS' column-alias beign ignored on outer select

["Thomas F. O'Connell" <tfo@xxxxxxxxxxxx>]

On Dec 2, 2005, at 6:00 AM, Markus Wollny wrote:

> Hi!
>
> Is this the expected behaviour?
>
>  select ID
>   , USK_RATING AS USK
>   from (
>    select ID
>     , USK_RATING
>    from MAIN_SONY_PS2_GAME
>    where ID = 101400
>    limit 1
>    )
>    as PRODUCT_LIST
>  limit 1;
>
>    id   | usk_rating
> --------+------------
>  101400 |
> (1 row)
>
> Note the column-header being labeled 'usk_rating', not 'usk'.  
> Obviously
> the 'AS' column alias of the outer select is being ignored in the
> resultset.
>
>  select ID
>   , USK
>   from (
>    select ID
>     , USK_RATING AS USK
>    from MAIN_SONY_PS2_GAME
>    where ID = 101400
>    limit 1
>    )
>    as PRODUCT_LIST
>  limit 1;
>
>    id   | usk
> --------+-----
>  101400 |
> (1 row)
>
> If the column alias is being declared in the subselect, the column  
> alias
> is working.
>
>  select version();
>                                version
> ----------------------------------------------------------------------
>  PostgreSQL 8.1.0 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2
>
> Is this working as expected or is this a bug?


I have to say, this looks like a regression. I can't reproduce it in  
an 8.0.3 database. The interesting thing is that the bug seems to be  
related to the limit clause of the inner query. Hackers?

--
Thomas F. O'Connell
Database Architecture and Programming
Co-Founder
Sitening, LLC

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