Re: Setting all elements in an Bool[] array to the same

try this,
test=# select array(select 1 from
generate_series(0,array_upper('{1,2,3,4,5}'::int[],1)));
?column?
---------------
{1,1,1,1,1,1}
(1 row)

test=# select array(select true from
generate_series(0,array_upper('{1,2,3,4,5}'::int[],1)));
?column?
---------------
{t,t,t,t,t,t}
(1 row)

with regards,
S.Gnanavel

> -----Original Message-----
> From: mike(at)fuhr(dot)org
> Sent: Fri, 10 Jun 2005 04:56:55 -0600
> To: o(dot)blomqvist(at)secomintl(dot)com
> Subject: Re: [GENERAL] Setting all elements in an Bool[] array to the
> same value
>
> On Thu, Jun 09, 2005 at 06:10:28PM -0700, Otto Blomqvist wrote:
> >
> > Is there any way to set all elements in a long boolean array (bool[])
> to
> > the same value ?
>
> In PostgreSQL 7.4 and later you could write a polymorphic function
> to fill any type of array. Here's a simple example that handles
> one-dimensional arrays:
>
> CREATE FUNCTION array_fill(anyarray, anyelement) RETURNS anyarray AS '
> DECLARE
> a $0%TYPE := ''{}'';
> i integer;
> BEGIN
> FOR i IN array_lower($1, 1) .. array_upper($1, 1) LOOP
> a[i] := $2;
> END LOOP;
>
> RETURN a;
> END;
> ' LANGUAGE plpgsql IMMUTABLE STRICT;
>
> CREATE TABLE foo (
> id serial PRIMARY KEY,
> barray boolean[],
> iarray integer[]
> );
>
> INSERT INTO foo (barray, iarray) VALUES ('{t,f}', '{1,2,3}');
> INSERT INTO foo (barray, iarray) VALUES ('{t,f,t,f}', '{4,5,6,7,8,9}');
>
> SELECT * FROM foo ORDER BY id;
> id | barray | iarray
> ----+-----------+---------------
> 1 | {t,f} | {1,2,3}
> 2 | {t,f,t,f} | {4,5,6,7,8,9}
> (2 rows)
>
> UPDATE foo SET barray = array_fill(barray, false),
> iarray = array_fill(iarray, 0);
>
> SELECT * FROM foo ORDER BY id;
> id | barray | iarray
> ----+-----------+---------------
> 1 | {f,f} | {0,0,0}
> 2 | {f,f,f,f} | {0,0,0,0,0,0}
> (2 rows)
>
> --
> Michael Fuhr
> http://www.fuhr.org/~mfuhr/
>
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