-- shouldn't the first SELECT query perform the GROUP BY and ORDER BY upon the date
-- in the outer SELECT as in the second query
BEGIN;

CREATE TABLE test_dates (
	date TIMESTAMP
);

INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 0);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 1);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 2);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 3);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 4);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 5);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 6);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 7);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 8);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 9);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 10);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 11);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 12);
INSERT INTO test_dates VALUES (current_timestamp::date + interval '1 day' * 13);

SELECT date - interval '1 day' * EXTRACT(dow FROM date) AS date FROM (SELECT date FROM test_dates) AS sub GROUP BY date ORDER BY date;
SELECT date - interval '1 day' * EXTRACT(dow FROM date) AS date FROM (SELECT date FROM test_dates) AS sub GROUP BY 1 ORDER BY 1;

ROLLBACK;