# name: test/issues/general/test_2743.test
# description: Issue 2743: RuntimeError: Not implemented Error: UNIONS are not supported in recursive CTEs yet
# group: [general]

statement ok
PRAGMA enable_verification

query II
WITH RECURSIVE t(x, y) AS
(
  SELECT 1, 1
    UNION ALL
  SELECT 1, 2
    UNION ALL
  (SELECT x+1, 1
  FROM   t
  WHERE  x < 10 AND y = 1
    UNION ALL
  SELECT x+1, 2
  FROM   t
  WHERE  x < 10 AND y = 2)
)
SELECT * FROM t ORDER BY x, y;
----
1	1
1	2
2	1
2	2
3	1
3	2
4	1
4	2
5	1
5	2
6	1
6	2
7	1
7	2
8	1
8	2
9	1
9	2
10	1
10	2

query II
WITH RECURSIVE t(x, y) AS
(
  SELECT 1, 1
    UNION ALL
  SELECT 1, 2
    UNION ALL
  SELECT t, z
  FROM   t, LATERAL
    (SELECT x+1, 2
     WHERE  t.y = 1
      UNION ALL
     SELECT x+1, 1
     WHERE t.y = 2) AS _(t, z)
  WHERE t.x < 10
)
SELECT * FROM t ORDER BY x, y;
----
1	1
1	2
2	1
2	2
3	1
3	2
4	1
4	2
5	1
5	2
6	1
6	2
7	1
7	2
8	1
8	2
9	1
9	2
10	1
10	2

query II
WITH RECURSIVE t(x, y) AS
(
  SELECT 1, 1
    UNION
  SELECT 1, 2
    UNION
  (SELECT x+1, 1
  FROM   t
  WHERE  x < 10 AND y = 1
    UNION ALL
  SELECT x+1, 1
  FROM   t
  WHERE  x < 10 AND y = 2)
)
SELECT * FROM t ORDER BY x, y;
----
1	1
1	2
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1

statement ok
CREATE TABLE flights (
  source  TEXT,
  dest    TEXT,
  carrier TEXT
);

statement ok
INSERT INTO flights VALUES
('A', 'B', 'C1'),
('A', 'C', 'C2'),
('A', 'D', 'C1'),
('B', 'D', 'C3'),
('C', 'E', 'C3')
;

statement ok
CREATE TABLE trains (
  source TEXT,
  dest   TEXT
);

statement ok
INSERT INTO trains VALUES
('B', 'C'),
('A', 'E'),
('C', 'E')
;

query III
WITH RECURSIVE connections(source, dest, carrier) AS (
     (SELECT f.source, f.dest, f.carrier
      FROM flights f
      WHERE f.source = 'A'
    UNION ALL
      SELECT r.source, r.dest, 'Rail' AS carrier
      FROM trains r
      WHERE r.source = 'A')
  UNION ALL -- two recursive terms below
     (SELECT c.source, f.dest, f.carrier
      FROM connections c, flights f
      WHERE c.dest = f.source
    UNION ALL
      SELECT c.source, r.dest, 'Rail' AS carrier
      FROM connections c, trains r
      WHERE c.dest = r.source)
)
SELECT * FROM connections ORDER BY source, dest, carrier;
----
A	B	C1
A	C	C2
A	C	Rail
A	D	C1
A	D	C3
A	E	C3
A	E	C3
A	E	Rail
A	E	Rail
A	E	Rail

query I
WITH RECURSIVE t(x) AS
(
  (SELECT 2
    UNION
  SELECT 1)
    UNION ALL
  (SELECT x+1
  FROM   t
  WHERE  x < 4
    UNION
  SELECT x*2
  FROM   t
  WHERE  x >= 4 AND x < 8
    UNION ALL
  SELECT x+1
  FROM   t
  WHERE  x >= 4 AND x < 8)
) SELECT * FROM t ORDER BY x;
----
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
8
8
10
10
12
12
14
14

query I
WITH RECURSIVE foo(i) AS
    (values (1)
      UNION
    (SELECT i+1 FROM foo WHERE i < 2
      UNION ALL
    SELECT i+1 FROM foo WHERE i < 2
      UNION
    SELECT i+1 FROM foo WHERE i < 2
      UNION ALL
    SELECT i+1 FROM foo WHERE i < 2
      UNION
    SELECT i+1 FROM foo WHERE i < 2
      UNION ALL
    SELECT i+1 FROM foo WHERE i < 2
      UNION
    SELECT i+1 FROM foo WHERE i < 2
      UNION ALL
    SELECT i+1 FROM foo WHERE i < 2
      UNION
    SELECT i+1 FROM foo WHERE i < 2
      UNION ALL
    SELECT i+1 FROM foo WHERE i < 2
      UNION
    SELECT i+1 FROM foo WHERE i < 2)
) SELECT * FROM foo ORDER BY i;
----
1
2