array_to_column function

Kind people,

Here's something I came up with, having accidentally discovered the
ARRAY() constructor (BTW, I think at least some pointer to it should
be in the array section of functions & operators).

CREATE OR REPLACE FUNCTION array_to_column (ANYARRAY)
RETURNS SETOF ANYELEMENT
IMMUTABLE
LANGUAGE plpgsql
AS $$
BEGIN
IF (position('][' IN array_dims($1)) <> 0)
THEN
RAISE EXCEPTION 'Only 1-dimensional arrays are allowed!';
END IF;
FOR i IN array_lower($1, 1) .. array_upper($1, 1)
LOOP
RETURN NEXT $1[i];
END LOOP;
RETURN;
END;
$$;

Thanks to Markus Bertheau aka ska-fan for help with removing an
unneeded regex compare and with spelling. :)

Cheers,
D
--
David Fetter david(at)fetter(dot)org http://fetter.org/
phone: +1 510 893 6100 mobile: +1 415 235 3778

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