SET search_path TO local_dist_join_mixed;

SELECT COUNT(*) FROM reference LEFT JOIN distributed USING (id);

SELECT COUNT(*) FROM distributed RIGHT JOIN reference USING (id);

SELECT COUNT(*) FROM reference FULL JOIN distributed USING (id);
SELECT COUNT(*) FROM distributed FULL JOIN reference USING (id);

SELECT COUNT(*) FROM distributed FULL JOIN reference USING (id);

-- distributed side is a subquery
SELECT COUNT(*) FROM reference LEFT JOIN (SELECT * FROM distributed) q USING (id);

-- distributed side is a join tree
SELECT COUNT(*) FROM reference LEFT JOIN (distributed t1 JOIN distributed t2 USING (id)) q USING (id);
SELECT COUNT(*) FROM reference LEFT JOIN (distributed t1 LEFT JOIN distributed t2 USING (id)) q USING (id);


SELECT COUNT(*) FROM
-- 2) right side is distributed but t1 is recurring, hence what
--    makes the right side distributed (t4) is recursively planned
reference t1
LEFT JOIN
(
    distributed t4
    JOIN
    -- 1) t6 is recursively planned since the outer side is recurring
    (SELECT t6.id FROM distributed t6 RIGHT JOIN reference t7 USING(id)) t5
    USING(id)
) q
USING(id)
-- 3) outer side of the join tree became recurring, hence t8 is
--    recursively planned too
LEFT JOIN
distributed t8
USING (id)
WHERE t8.id IS NULL;

SELECT COUNT(*) FROM
local t1
LEFT JOIN
-- 2) t6 subquery is distributed so needs to be recursively planned
--    because t1 is first recursively planned
(
    SELECT * FROM
    (SELECT * FROM reference t2 JOIN distributed t3 USING (id)) p
    JOIN
    -- 1) t5 is recursively planned since the outer side is recurring
    (SELECT * FROM reference t4 LEFT JOIN distributed t5 USING (id)) q
    USING(id)
) t6
USING (id);

BEGIN;
  WITH cte AS (
    DELETE FROM distributed
    USING (
        SELECT t1.id, t1.id*3 FROM reference t1
        LEFT JOIN
        (
            SELECT * FROM distributed t2 WHERE EXISTS (
                SELECT * FROM distributed t4
                WHERE t4.id = t2.id
            )
        ) t3
        USING (id)
    ) q
    WHERE distributed.id = q.id AND
          distributed.id > 65
    RETURNING *
  )
  SELECT COUNT(*) FROM cte;
ROLLBACK;