[HACKERS] array_to_column function

[David Fetter]

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 [EMAIL PROTECTED] http://fetter.org/
phone: +1 510 893 6100   mobile: +1 415 235 3778

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