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--
-- Perl Weekly Challenge 263
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-263>
--
CREATE SCHEMA IF NOT EXISTS pwc263;
CREATE OR REPLACE FUNCTION
pwc263.task2_plpgsql( i int[], j int[] )
RETURNS TABLE( item int, qty int )
AS $CODE$
DECLARE
BEGIN
CREATE TEMPORARY TABLE IF NOT EXISTS q( item int, qty int );
TRUNCATE TABLE q;
FOR x IN 1 .. array_length( i, 1 ) LOOP
IF mod( x, 2 ) = 0 THEN
CONTINUE;
END IF;
INSERT INTO q( item, qty )
VALUES ( i[ x ], i[ x + 1 ] );
END LOOP;
FOR x IN 1 .. array_length( j, 1 ) LOOP
IF mod( x, 2 ) = 0 THEN
CONTINUE;
END IF;
INSERT INTO q( item, qty )
VALUES ( j[ x ], j[ x + 1 ] );
END LOOP;
RETURN QUERY
SELECT q.item, sum( q.qty )::int
FROM q
GROUP BY q.item;
END
$CODE$
LANGUAGE plpgsql;
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