Re: pg_dump produces invalid SQL for "group by cast(null as numeric)"

FYI, this was fixed in 8.3.0; not sure you got the report of the fix.

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Martin Pitt wrote:
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> Hi PostgreSQL developers,
>
> in [1], a user reported a failure of pg_dump:
>
> -------- snip ----------
> 1. Create an empty database.
>
> 2. Connect to the database and create these views:
>
> create view foo as select 3;
> create view bar as select count(*) from foo group by cast(null as numeric);
>
> 3. pg_dump the database to a text file. The file contains
>
> 'CREATE VIEW bar AS
> SELECT count(*) AS count FROM foo GROUP BY 2;'
>
> 4. Drop view bar from the database.
>
> 5. Run the CREATE VIEW bar..; statement from the text file.
>
> 6. The statement fails with
>
> 'ERROR: GROUP BY position 2 is not in select list'
> -------- snip ----------
>
> I verified that this is still an issue on 8.3 CVS head.
>
> However, I admit that I'm not sure why "group by cast(null as
> numeric)" is useful. However, it actually works in the DB and fails in
> pg_dump, so either it is valid and should be handled by pg_dump, or it
> is invalid and should not be accepted in the first place.
>
> Thank you!
>
> Martin
>
> [1] https://bugs.launchpad.net/bugs/177382
>
> --
> Martin Pitt http://www.piware.de
> Ubuntu Developer http://www.ubuntu.com
> Debian Developer http://www.debian.org
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Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://postgres.enterprisedb.com

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