Re: Function accepting array of complex type

Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com> writes:
> This works:
> CREATE TYPE c AS (r float, i float);
> CREATE FUNCTION mag(c c) RETURNS float LANGUAGE sql AS $$
> SELECT sqrt(c.r^2 + c.i^2)
> $$;
> SELECT mag( (2.2, 2.2) );
> mag
> ------------------
> 3.11126983722081

> But this doesn't:
> CREATE FUNCTION magsum( c c[] ) RETURNS float LANGUAGE sql AS $$
> SELECT sum(sqrt(c.r^2 + c.i^2)) FROM unnest(c) c
> $$;
> SELECT magsum( array[row(2.1, 2.1), row(2.2,2.2)] );
> ERROR: function magsum(record[]) does not exist at character 8

You need to cast it to some specific record type:

regression=# SELECT magsum( array[row(2.1, 2.1), row(2.2,2.2)]::c[] );
magsum
------------------
6.08111831820431
(1 row)

regards, tom lane