CREATE SCHEMA issue_6872;
SET search_path to 'issue_6872';
CREATE TABLE ref0(id int);
SELECT create_reference_table('ref0');
 create_reference_table
---------------------------------------------------------------------

(1 row)

CREATE TABLE ref1(id int);
SELECT create_reference_table('ref1');
 create_reference_table
---------------------------------------------------------------------

(1 row)

CREATE TABLE dist0(id int);
SELECT create_distributed_table('dist0','id');
 create_distributed_table
---------------------------------------------------------------------

(1 row)

CREATE TABLE dist1(id int);
SELECT create_distributed_table('dist1','id');
 create_distributed_table
---------------------------------------------------------------------

(1 row)

INSERT INTO dist0 SELECT i FROM generate_series(0,10) i;
INSERT INTO dist0 SELECT i FROM generate_series(1005,1025) i;
INSERT INTO dist0 SELECT * FROM dist0 ORDER BY id LIMIT 1;
INSERT INTO ref0 SELECT i FROM generate_series(0,10) i;
INSERT INTO ref0 SELECT i FROM generate_series(1010,1030) i;
INSERT INTO ref0 SELECT NULL FROM generate_series(0,1) i;
INSERT INTO ref0 SELECT * FROM ref0 ORDER BY id LIMIT 1;
INSERT INTO dist1 SELECT i FROM generate_series(0,10) i;
INSERT INTO dist1 SELECT i FROM generate_series(1015,1035) i;
INSERT INTO dist1 SELECT * FROM dist1 ORDER BY id LIMIT 1;
INSERT INTO ref1 SELECT i FROM generate_series(0,10) i;
INSERT INTO ref1 SELECT i FROM generate_series(1020,1040) i;
INSERT INTO ref1 SELECT NULL FROM generate_series(0,1) i;
INSERT INTO ref1 SELECT * FROM ref1 ORDER BY id LIMIT 1;
-- added to verify we fixed the issue https://github.com/citusdata/citus/issues/6872
-- generated by Citus query generator tool
WITH cte_0 AS (
  SELECT
    table_0.id
  FROM
    dist0 AS table_0
    INNER JOIN ref0 AS table_1 USING (id)
  ORDER BY
    id
)
SELECT
  avg(avgsub.id)
FROM
  (
    SELECT
      table_2.id
    FROM
      (
        SELECT
          table_3.id
        FROM
          cte_0 AS table_3
        ORDER BY
          id
      ) AS table_2
    WHERE
      table_2.id IN (
        SELECT
          table_4.id
        FROM
          dist0 AS table_4
          RIGHT JOIN (
            SELECT
              table_6.id
            FROM
              dist0 AS table_6
              INNER JOIN ref1 AS table_7 USING (id)
            ORDER BY
              id
            LIMIT
              28
          ) AS table_5 USING (id)
          RIGHT JOIN dist1 AS table_8 USING (id)
        WHERE
          table_8.id = 6
        ORDER BY
          id
      )
  ) AS avgsub;
        avg
---------------------------------------------------------------------
 6.0000000000000000
(1 row)

DROP SCHEMA issue_6872 CASCADE;
NOTICE:  drop cascades to 4 other objects
DETAIL:  drop cascades to table ref0
drop cascades to table ref1
drop cascades to table dist0
drop cascades to table dist1