Re: expressions operating on arrays

Great !
I'll try patching it.

Thanks Oleg & Teodor for doing all this great work !

Long live PostgreSQL !

see yea,

John

On Fri, 9 Aug 2002, Oleg Bartunov wrote:

> Hmm,
>
> you dont' need to use GiST supporting functions !
> We've posted a patch to current CVS, it has everything you need.
> Please, check http://www.sai.msu.su/~megera/postgres/gist/code/7.3/README.intarray
>
> It looks like that patch should works with 7.2 also.
>
> Oleg
> On Fri, 9 Aug 2002 h012(at)ied(dot)com wrote:
>
> >
> > thanks for the pointer, I'm now able to use the operators in expressions!
> >
> > w.r.t. modifying the array contents: I looked through
> > /usr/lib/pgsql/contrib/intarray/_int.sql.in , but it didn't make me any
> > smarter. Are the "..._union" and "..._picksplit" functions supposed to add
> > into and remove elements from the arrays ? How would one update a row,
> > then, to add an element into one array and remove an element from another?
> >
> > create table t(id int4[], txt text[]);
> > update t set id=g_int_union(t.id, '{555}') where t.id *= 444; -- ??
> > update t set text=g_int_picksplit(t.text, '{"removeme"}') where t.text *= "removeme"; -- ??
> >
> > thx,
> >
> > John
> >
> > On Fri, 9 Aug 2002, Oleg Bartunov wrote:
> >
> > > Look at contrib/intarray. You'll get an index access as a bonus
> > >
> > > Oleg
> >
> > On Fri, 9 Aug 2002, Achilleus Mantzios wrote:
> >
> > >
> > > look at /usr/local/src/postgresql-7.2.1/contrib/intarray
> > >
> > >
> >
> > > On Fri, 9 Aug 2002 h012(at)ied(dot)com wrote:
> > >
> > > >
> > > >
> > > > Hi,
> > > >
> > > > I would like to say:
> > > >
> > > > create table test1 (array1 int4[]);
> > > > insert into test1 values ('{123,234,345}');
> > > > insert into test1 values ('{456,567,678}');
> > > >
> > > > now what I don't know how to do:
> > > >
> > > > -- consider contents of array:
> > > > select * from test1 where array1 CONTAINS 567;
> > > >
> > > > -- APPEND '789' to array in second row:
> > > > update test1 set array1=(select array1 from test1 where array1 CONTAINS
> > > > '567' UNION select '789');
> > > >
> > > >
> > > > How do I go about expressing and operating on the contents of an array ?
> > > >
> > > >
> > > > Thanks,
> > > >
> > > > John
> >
> >
>
> Regards,
> Oleg
> _____________________________________________________________
> Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
> Sternberg Astronomical Institute, Moscow University (Russia)
> Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
> phone: +007(095)939-16-83, +007(095)939-23-83
>

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