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CREATE TYPE resolution AS ENUM ('unknown', 'nonstandard', '640x480', '800x600', '1024x768', '1280x960', '1600x1200', '640x400', '960x600', '1024x576', '1024x600', '1024x640', '1280x720', '1280x800', '1366x768', '1600x900', '1920x1080');
CREATE OR REPLACE FUNCTION conv_resolution(integer) RETURNS resolution AS $$
SELECT CASE
WHEN $1 = 0 THEN 'unknown'::resolution
WHEN $1 = 1 THEN 'nonstandard'
WHEN $1 = 2 THEN '640x480'
WHEN $1 = 3 THEN '800x600'
WHEN $1 = 4 THEN '1024x768'
WHEN $1 = 5 THEN '1280x960'
WHEN $1 = 6 THEN '1600x1200'
WHEN $1 = 7 THEN '640x400'
WHEN $1 = 8 THEN '960x600'
WHEN $1 = 9 THEN '1024x576'
WHEN $1 = 10 THEN '1024x600'
WHEN $1 = 11 THEN '1024x640'
WHEN $1 = 12 THEN '1280x720'
WHEN $1 = 13 THEN '1280x800'
WHEN $1 = 14 THEN '1366x768'
WHEN $1 = 15 THEN '1600x900'
WHEN $1 = 16 THEN '1920x1080'
END $$ LANGUAGE SQL;
ALTER TABLE releases ALTER COLUMN resolution DROP DEFAULT;
ALTER TABLE releases ALTER COLUMN resolution TYPE resolution USING conv_resolution(resolution);
ALTER TABLE releases ALTER COLUMN resolution SET DEFAULT 'unknown';
ALTER TABLE releases_hist ALTER COLUMN resolution DROP DEFAULT;
ALTER TABLE releases_hist ALTER COLUMN resolution TYPE resolution USING conv_resolution(resolution);
ALTER TABLE releases_hist ALTER COLUMN resolution SET DEFAULT 'unknown';
DROP FUNCTION conv_resolution(int);
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