From: | Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com> |
---|---|
To: | Elielson Fontanezi <ElielsonF(at)prodam(dot)sp(dot)gov(dot)br> |
Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org>, pgsql-sql <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: [SQL] ERROR: DefineIndex: index function must be |
Date: | 2003-07-25 19:24:56 |
Message-ID: | 20030725122348.L37941-100000@megazone.bigpanda.com |
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Lists: | pgsql-general pgsql-sql |
On Fri, 25 Jul 2003, Stephan Szabo wrote:
> On Fri, 25 Jul 2003, Elielson Fontanezi wrote:
>
> > What can I do in this case?
> > I could not found anything about iscachable.
>
>
> >
> > postgres$ cat in.sql
> > create index bt_proposta_f01 on proposta
> > using btree (func_cod_secretaria(nr_proponente));
> >
> > postgres$ psql -d escola -f in.sql
> > psql:in.sql:2: ERROR: DefineIndex: index function must be marked iscachable
>
> Check the create function reference page, I believe you'd need to add WITH
> (iscachable) to the end of the function creation.
>
> iscachable means that the function always returnes the same result when
> given the same arguments. It's a prereq to using the function in an
> index. If your function doesn't meet those requirements (for example if it
> does a query on a table) making an index on that function is a bad idea.
Almost forgot. In recent versions you'd specify that the function was
IMMUTABLE and I believe the error message would use such as well. What
version are you using (it might be worth considering an upgrade to 7.4
when it comes out)
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