Re: Why an array in pg_group?

On Tuesday 26 November 2002 09:05 pm, Hannu Krosing wrote:
> Reinoud van Leeuwen kirjutas K, 20.11.2002 kell 17:03:
> > Hi,
> >
> > Is there any reason why the grolist field in the table pg_group is
> > implemented as an array and not as a separate table?
>
> most likely for performance reasons.
>
> > According to the documentation:
> >
> > <quote source="Postgresql 7.2 User Manual, chapter 6 near the end">
> > Arrays are not sets; using arrays in the manner described in the previous
> > paragraph is often a sign of database misdesign.
> > </quote>
> >
> > I have trouble implementing a way to easily check whether a user is part
> > of a group. (I use Apache::AuthDBI to implement authentication and wanted
> > to make a view with columns username, userid , groupname. And installing
> > the contrib/array give's me a postgresql that is different from all the
> > others :-(
>
> not from those who also have installed contrib/array ;)
>
> but you should actually be using contrib/intagg (and perhaps contrib
> intarray) for performance reasons ;)
Can You make syntax (operator or function) like :

scalar integer IN array integers
for join scalar and array fileds ?

in base PostgreSQL ?

regards
Haris Peco