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--
-- Perl Weekly Challenge 264
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-264>
--
CREATE SCHEMA IF NOT EXISTS pwc264;
CREATE OR REPLACE FUNCTION
pwc264.task2_plpgsql( s_a int[], i_a int[] )
RETURNS SETOF int
AS $CODE$
DECLARE
target_index int;
current_index int;
BEGIN
CREATE TEMPORARY TABLE IF NOT EXISTS target( i int, v int );
TRUNCATE target;
FOR current_index IN SELECT v::int FROM unnest( i_a ) v LOOP
target_index := i_a[ current_index ];
PERFORM *
FROM target
WHERE i = target_index;
IF FOUND THEN
UPDATE target
SET i = i + 1
WHERE i >= target_index;
END IF;
INSERT INTO target( i, v )
VALUES ( target_index, s_a[ current_index ] );
END LOOP;
RETURN QUERY
SELECT v
FROM target
ORDER BY i;
END
$CODE$
LANGUAGE plpgsql;
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