Re: Adding a column with default value possibly corrupting a functional index.

On 12/16/06, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> "Rajesh Kumar Mallah" <mallah(dot)rajesh(at)gmail(dot)com> writes:
> > I have an index on upper(general.cat_url(category_id)) on a table.
> > when i add a column *with* default value , a query that previously
> > used to give result does not give results anymore. REINDEX'ing the
> > table produces correct result.
>
> Can you provide a self-contained example of this?

Hi,

thanks for the reply.

that was the first thing i was trying to do before the post
so far i have not been able to.

What PG version are
> you using?

8.2.0

What is that nonstandard function you're using in the index?

Its declared immutable , it queries the same table , its recursive
and it queries another custom function also.

dumping the function def below , lemme know if there is anything
obvious.

Warm Regds
mallah.

CREATE OR REPLACE FUNCTION general.cat_url (integer) RETURNS varchar AS '

DECLARE v_category_id ALIAS FOR $1;
DECLARE tmp_record RECORD;
DECLARE tmp_name VARCHAR;
DECLARE tmp_code VARCHAR;

BEGIN
tmp_code := '''' ;

IF v_category_id = -1 THEN
RETURN ''NO SUCH CATEGORY'';
END IF;

SELECT INTO tmp_record name, category_id, parent_category_id from
general.web_category_master join general.category_tree using(category_id)
where category_id=v_category_id and link is false;

IF NOT FOUND THEN
RETURN '''';
END IF;

tmp_name := general.cat_url(tmp_record.parent_category_id) ;

IF tmp_record.category_id <> 0 THEN
tmp_code := tmp_name || ''/'' ||
general.dir_name(tmp_record.name)
;
END IF;

tmp_code = ltrim(tmp_code,''/'');
RETURN tmp_code;
END;

' LANGUAGE 'plpgsql' IMMUTABLE;

regards, tom lane
>