SET citus.next_shard_id TO 20080000;
CREATE SCHEMA anonymous_columns;
SET search_path TO anonymous_columns;
CREATE TABLE t0 (a int PRIMARY KEY, b int, "?column?" text);
SELECT create_distributed_table('t0', 'a');
 create_distributed_table
---------------------------------------------------------------------

(1 row)

INSERT INTO t0 VALUES (1, 2, 'hello'), (2, 4, 'world');
SELECT "?column?" FROM t0 ORDER BY 1;
 ?column?
---------------------------------------------------------------------
 hello
 world
(2 rows)

WITH a AS (SELECT * FROM t0) SELECT "?column?" FROM a ORDER BY 1;
 ?column?
---------------------------------------------------------------------
 hello
 world
(2 rows)

WITH a AS (SELECT '' FROM t0) SELECT * FROM a;
 ?column?
---------------------------------------------------------------------


(2 rows)

-- test CTE's that could be rewritten as subquery
WITH a AS (SELECT '' FROM t0 GROUP BY a) SELECT * FROM a;
 ?column?
---------------------------------------------------------------------


(2 rows)

WITH a AS (SELECT '' FROM t0 GROUP BY b) SELECT * FROM a;
 ?column?
---------------------------------------------------------------------


(2 rows)

WITH a AS (SELECT '','' FROM t0 GROUP BY a) SELECT * FROM a;
 ?column? | ?column?
---------------------------------------------------------------------
          |
          |
(2 rows)

WITH a AS (SELECT '','' FROM t0 GROUP BY b) SELECT * FROM a;
 ?column? | ?column?
---------------------------------------------------------------------
          |
          |
(2 rows)

WITH a AS (SELECT 1, * FROM t0 WHERE a = 1) SELECT * FROM a;
 ?column? | a | b | ?column?
---------------------------------------------------------------------
        1 | 1 | 2 | hello
(1 row)

-- test CTE's that are referenced multiple times and hence need to stay CTE's
WITH a AS (SELECT '' FROM t0 WHERE a = 1) SELECT * FROM a, a b;
 ?column? | ?column?
---------------------------------------------------------------------
          |
(1 row)

WITH a AS (SELECT '','' FROM t0 WHERE a = 42) SELECT * FROM a, a b;
 ?column? | ?column? | ?column? | ?column?
---------------------------------------------------------------------
(0 rows)

-- test with explicit subqueries
SELECT * FROM (SELECT a, '' FROM t0 GROUP BY a) as foo ORDER BY 1;
 a | ?column?
---------------------------------------------------------------------
 1 |
 2 |
(2 rows)

SELECT * FROM (SELECT a, '', '' FROM t0 GROUP BY a ) as foo ORDER BY 1;
 a | ?column? | ?column?
---------------------------------------------------------------------
 1 |          |
 2 |          |
(2 rows)

SELECT * FROM (SELECT b, '' FROM t0 GROUP BY b ) as foo ORDER BY 1;
 b | ?column?
---------------------------------------------------------------------
 2 |
 4 |
(2 rows)

SELECT * FROM (SELECT b, '', '' FROM t0 GROUP BY b ) as foo ORDER BY 1;
 b | ?column? | ?column?
---------------------------------------------------------------------
 2 |          |
 4 |          |
(2 rows)

-- some tests that follow very similar codeoaths
SELECT a + 1 FROM t0 ORDER BY 1;
 ?column?
---------------------------------------------------------------------
        2
        3
(2 rows)

SELECT a + 1, a - 1 FROM t0 ORDER BY 1;
 ?column? | ?column?
---------------------------------------------------------------------
        2 |        0
        3 |        1
(2 rows)

WITH cte1 AS (SELECT row_to_json(row(a))->'f1' FROM t0) SELECT * FROM cte1 ORDER BY "?column?"::text;
 ?column?
---------------------------------------------------------------------
 1
 2
(2 rows)

-- clean up after test
SET client_min_messages TO WARNING;
DROP SCHEMA anonymous_columns CASCADE;