ALTER SEQUENCE pg_catalog.pg_dist_shardid_seq RESTART 840000;
ALTER SEQUENCE pg_catalog.pg_dist_jobid_seq RESTART 840000;
-- ===================================================================
-- test router planner functionality for single shard select queries
-- ===================================================================
CREATE TABLE articles_hash (
	id bigint NOT NULL,
	author_id bigint NOT NULL,
	title varchar(20) NOT NULL,
	word_count integer
);
CREATE TABLE articles_range (
	id bigint NOT NULL,
	author_id bigint NOT NULL,
	title varchar(20) NOT NULL,
	word_count integer
);
-- Check for the existence of line 'DEBUG:  Creating router plan'
-- to determine if router planner is used.
-- this table is used in a CTE test
CREATE TABLE authors_hash ( name text, id bigint );
-- this table is used in router executor tests
CREATE TABLE articles_single_shard_hash (LIKE articles_hash);
SELECT master_create_distributed_table('articles_hash', 'author_id', 'hash');
 master_create_distributed_table 
---------------------------------
 
(1 row)

SELECT master_create_distributed_table('articles_single_shard_hash', 'author_id', 'hash');
 master_create_distributed_table 
---------------------------------
 
(1 row)

-- test when a table is distributed but no shards created yet
SELECT count(*) from articles_hash;
 count 
-------
     0
(1 row)

SELECT master_create_worker_shards('articles_hash', 2, 1);
 master_create_worker_shards 
-----------------------------
 
(1 row)

SELECT master_create_worker_shards('articles_single_shard_hash', 1, 1);
 master_create_worker_shards 
-----------------------------
 
(1 row)

-- create a bunch of test data
INSERT INTO articles_hash VALUES ( 1,  1, 'arsenous', 9572);
INSERT INTO articles_hash VALUES ( 2,  2, 'abducing', 13642);
INSERT INTO articles_hash VALUES ( 3,  3, 'asternal', 10480);
INSERT INTO articles_hash VALUES ( 4,  4, 'altdorfer', 14551);
INSERT INTO articles_hash VALUES ( 5,  5, 'aruru', 11389);
INSERT INTO articles_hash VALUES ( 6,  6, 'atlases', 15459);
INSERT INTO articles_hash VALUES ( 7,  7, 'aseptic', 12298);
INSERT INTO articles_hash VALUES ( 8,  8, 'agatized', 16368);
INSERT INTO articles_hash VALUES ( 9,  9, 'alligate', 438);
INSERT INTO articles_hash VALUES (10, 10, 'aggrandize', 17277);
INSERT INTO articles_hash VALUES (11,  1, 'alamo', 1347);
INSERT INTO articles_hash VALUES (12,  2, 'archiblast', 18185);
INSERT INTO articles_hash VALUES (13,  3, 'aseyev', 2255);
INSERT INTO articles_hash VALUES (14,  4, 'andesite', 19094);
INSERT INTO articles_hash VALUES (15,  5, 'adversa', 3164);
INSERT INTO articles_hash VALUES (16,  6, 'allonym', 2);
INSERT INTO articles_hash VALUES (17,  7, 'auriga', 4073);
INSERT INTO articles_hash VALUES (18,  8, 'assembly', 911);
INSERT INTO articles_hash VALUES (19,  9, 'aubergiste', 4981);
INSERT INTO articles_hash VALUES (20, 10, 'absentness', 1820);
INSERT INTO articles_hash VALUES (21,  1, 'arcading', 5890);
INSERT INTO articles_hash VALUES (22,  2, 'antipope', 2728);
INSERT INTO articles_hash VALUES (23,  3, 'abhorring', 6799);
INSERT INTO articles_hash VALUES (24,  4, 'audacious', 3637);
INSERT INTO articles_hash VALUES (25,  5, 'antehall', 7707);
INSERT INTO articles_hash VALUES (26,  6, 'abington', 4545);
INSERT INTO articles_hash VALUES (27,  7, 'arsenous', 8616);
INSERT INTO articles_hash VALUES (28,  8, 'aerophyte', 5454);
INSERT INTO articles_hash VALUES (29,  9, 'amateur', 9524);
INSERT INTO articles_hash VALUES (30, 10, 'andelee', 6363);
INSERT INTO articles_hash VALUES (31,  1, 'athwartships', 7271);
INSERT INTO articles_hash VALUES (32,  2, 'amazon', 11342);
INSERT INTO articles_hash VALUES (33,  3, 'autochrome', 8180);
INSERT INTO articles_hash VALUES (34,  4, 'amnestied', 12250);
INSERT INTO articles_hash VALUES (35,  5, 'aminate', 9089);
INSERT INTO articles_hash VALUES (36,  6, 'ablation', 13159);
INSERT INTO articles_hash VALUES (37,  7, 'archduchies', 9997);
INSERT INTO articles_hash VALUES (38,  8, 'anatine', 14067);
INSERT INTO articles_hash VALUES (39,  9, 'anchises', 10906);
INSERT INTO articles_hash VALUES (40, 10, 'attemper', 14976);
INSERT INTO articles_hash VALUES (41,  1, 'aznavour', 11814);
INSERT INTO articles_hash VALUES (42,  2, 'ausable', 15885);
INSERT INTO articles_hash VALUES (43,  3, 'affixal', 12723);
INSERT INTO articles_hash VALUES (44,  4, 'anteport', 16793);
INSERT INTO articles_hash VALUES (45,  5, 'afrasia', 864);
INSERT INTO articles_hash VALUES (46,  6, 'atlanta', 17702);
INSERT INTO articles_hash VALUES (47,  7, 'abeyance', 1772);
INSERT INTO articles_hash VALUES (48,  8, 'alkylic', 18610);
INSERT INTO articles_hash VALUES (49,  9, 'anyone', 2681);
INSERT INTO articles_hash VALUES (50, 10, 'anjanette', 19519);
SET citus.task_executor_type TO 'real-time';
SET citus.large_table_shard_count TO 2;
SET client_min_messages TO 'DEBUG2';
-- insert a single row for the test
INSERT INTO articles_single_shard_hash VALUES (50, 10, 'anjanette', 19519);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
-- single-shard tests
-- test simple select for a single row
SELECT * FROM articles_hash WHERE author_id = 10 AND id = 50;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |   title   | word_count 
----+-----------+-----------+------------
 50 |        10 | anjanette |      19519
(1 row)

-- get all titles by a single author
SELECT title FROM articles_hash WHERE author_id = 10;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
   title    
------------
 aggrandize
 absentness
 andelee
 attemper
 anjanette
(5 rows)

-- try ordering them by word count
SELECT title, word_count FROM articles_hash
	WHERE author_id = 10
	ORDER BY word_count DESC NULLS LAST;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
   title    | word_count 
------------+------------
 anjanette  |      19519
 aggrandize |      17277
 attemper   |      14976
 andelee    |       6363
 absentness |       1820
(5 rows)

-- look at last two articles by an author
SELECT title, id FROM articles_hash
	WHERE author_id = 5
	ORDER BY id
	LIMIT 2;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
  title  | id 
---------+----
 aruru   |  5
 adversa | 15
(2 rows)

-- find all articles by two authors in same shard
-- but plan is not router executable due to order by
SELECT title, author_id FROM articles_hash
	WHERE author_id = 7 OR author_id = 8
	ORDER BY author_id ASC, id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
    title    | author_id 
-------------+-----------
 aseptic     |         7
 auriga      |         7
 arsenous    |         7
 archduchies |         7
 abeyance    |         7
 agatized    |         8
 assembly    |         8
 aerophyte   |         8
 anatine     |         8
 alkylic     |         8
(10 rows)

-- same query is router executable with no order by
SELECT title, author_id FROM articles_hash
	WHERE author_id = 7 OR author_id = 8;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
    title    | author_id 
-------------+-----------
 aseptic     |         7
 agatized    |         8
 auriga      |         7
 assembly    |         8
 arsenous    |         7
 aerophyte   |         8
 archduchies |         7
 anatine     |         8
 abeyance    |         7
 alkylic     |         8
(10 rows)

-- add in some grouping expressions, still on same shard
-- having queries unsupported in Citus
SELECT author_id, sum(word_count) AS corpus_size FROM articles_hash
	WHERE author_id = 1 OR author_id = 7 OR author_id = 8 OR author_id = 10
	GROUP BY author_id
	HAVING sum(word_count) > 1000
	ORDER BY sum(word_count) DESC;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 author_id | corpus_size 
-----------+-------------
        10 |       59955
         8 |       55410
         7 |       36756
         1 |       35894
(4 rows)

-- however having clause is supported if it goes to a single shard
SELECT author_id, sum(word_count) AS corpus_size FROM articles_hash
	WHERE author_id = 1
	GROUP BY author_id
	HAVING sum(word_count) > 1000
	ORDER BY sum(word_count) DESC;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 author_id | corpus_size 
-----------+-------------
         1 |       35894
(1 row)

-- query is a single shard query but can't do shard pruning,
-- not router-plannable due to <= and IN
SELECT * FROM articles_hash WHERE author_id <= 1; 
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

SELECT * FROM articles_hash WHERE author_id IN (1, 3); 
NOTICE:  cannot use shard pruning with ANY/ALL (array expression)
HINT:  Consider rewriting the expression with OR/AND clauses.
NOTICE:  cannot use shard pruning with ANY/ALL (array expression)
HINT:  Consider rewriting the expression with OR/AND clauses.
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
  3 |         3 | asternal     |      10480
 11 |         1 | alamo        |       1347
 13 |         3 | aseyev       |       2255
 21 |         1 | arcading     |       5890
 23 |         3 | abhorring    |       6799
 31 |         1 | athwartships |       7271
 33 |         3 | autochrome   |       8180
 41 |         1 | aznavour     |      11814
 43 |         3 | affixal      |      12723
(10 rows)

-- queries with CTEs are supported
WITH first_author AS ( SELECT id FROM articles_hash WHERE author_id = 1)
SELECT * FROM first_author;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id 
----
  1
 11
 21
 31
 41
(5 rows)

-- queries with CTEs are supported even if CTE is not referenced inside query
WITH first_author AS ( SELECT id FROM articles_hash WHERE author_id = 1)
SELECT title FROM articles_hash WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
    title     
--------------
 arsenous
 alamo
 arcading
 athwartships
 aznavour
(5 rows)

-- two CTE joins are supported if they go to the same worker
WITH id_author AS ( SELECT id, author_id FROM articles_hash WHERE author_id = 1),
id_title AS (SELECT id, title from articles_hash WHERE author_id = 1)
SELECT * FROM id_author, id_title WHERE id_author.id = id_title.id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | id |    title     
----+-----------+----+--------------
  1 |         1 |  1 | arsenous
 11 |         1 | 11 | alamo
 21 |         1 | 21 | arcading
 31 |         1 | 31 | athwartships
 41 |         1 | 41 | aznavour
(5 rows)

WITH id_author AS ( SELECT id, author_id FROM articles_hash WHERE author_id = 1),
id_title AS (SELECT id, title from articles_hash WHERE author_id = 3)
SELECT * FROM id_author, id_title WHERE id_author.id = id_title.id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | id | title 
----+-----------+----+-------
(0 rows)

-- CTE joins are not supported if table shards are at different workers
WITH id_author AS ( SELECT id, author_id FROM articles_hash WHERE author_id = 1),
id_title AS (SELECT id, title from articles_hash WHERE author_id = 2)
SELECT * FROM id_author, id_title WHERE id_author.id = id_title.id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840000
ERROR:  cannot perform distributed planning on this query
DETAIL:  Complex table expressions are currently unsupported
-- recursive CTEs are supported when filtered on partition column
CREATE TABLE company_employees (company_id int, employee_id int, manager_id int); 
SELECT master_create_distributed_table('company_employees', 'company_id', 'hash');
 master_create_distributed_table 
---------------------------------
 
(1 row)

SELECT master_create_worker_shards('company_employees', 4, 1);
 master_create_worker_shards 
-----------------------------
 
(1 row)

INSERT INTO company_employees values(1, 1, 0);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
INSERT INTO company_employees values(1, 2, 1);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
INSERT INTO company_employees values(1, 3, 1);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
INSERT INTO company_employees values(1, 4, 2);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
INSERT INTO company_employees values(1, 5, 4);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
INSERT INTO company_employees values(3, 1, 0);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
INSERT INTO company_employees values(3, 15, 1);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
INSERT INTO company_employees values(3, 3, 1);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
-- find employees at top 2 level within company hierarchy
WITH RECURSIVE hierarchy as (
	SELECT *, 1 AS level
		FROM company_employees
		WHERE company_id = 1 and manager_id = 0 
	UNION
	SELECT ce.*, (h.level+1)
		FROM hierarchy h JOIN company_employees ce
			ON (h.employee_id = ce.manager_id AND
				h.company_id = ce.company_id AND
				ce.company_id = 1))
SELECT * FROM hierarchy WHERE LEVEL <= 2;
DEBUG:  predicate pruning for shardId 840004
DEBUG:  predicate pruning for shardId 840005
DEBUG:  predicate pruning for shardId 840006
DEBUG:  predicate pruning for shardId 840004
DEBUG:  predicate pruning for shardId 840005
DEBUG:  predicate pruning for shardId 840006
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 company_id | employee_id | manager_id | level 
------------+-------------+------------+-------
          1 |           1 |          0 |     1
          1 |           2 |          1 |     2
          1 |           3 |          1 |     2
(3 rows)

-- query becomes not router plannble and gets rejected
-- if filter on company is dropped
WITH RECURSIVE hierarchy as (
	SELECT *, 1 AS level
		FROM company_employees
		WHERE company_id = 1 and manager_id = 0 
	UNION
	SELECT ce.*, (h.level+1)
		FROM hierarchy h JOIN company_employees ce
			ON (h.employee_id = ce.manager_id AND
				h.company_id = ce.company_id))
SELECT * FROM hierarchy WHERE LEVEL <= 2;
DEBUG:  predicate pruning for shardId 840004
DEBUG:  predicate pruning for shardId 840005
DEBUG:  predicate pruning for shardId 840006
ERROR:  cannot perform distributed planning on this query
DETAIL:  Complex table expressions are currently unsupported
-- logically wrong query, query involves different shards
-- from the same table
WITH RECURSIVE hierarchy as (
	SELECT *, 1 AS level
		FROM company_employees
		WHERE company_id = 3 and manager_id = 0 
	UNION
	SELECT ce.*, (h.level+1)
		FROM hierarchy h JOIN company_employees ce
			ON (h.employee_id = ce.manager_id AND
				h.company_id = ce.company_id AND
				ce.company_id = 2))
SELECT * FROM hierarchy WHERE LEVEL <= 2;
DEBUG:  predicate pruning for shardId 840003
DEBUG:  predicate pruning for shardId 840005
DEBUG:  predicate pruning for shardId 840006
DEBUG:  predicate pruning for shardId 840003
DEBUG:  predicate pruning for shardId 840004
DEBUG:  predicate pruning for shardId 840005
ERROR:  cannot perform distributed planning on this query
DETAIL:  Complex table expressions are currently unsupported
-- CTE with queries other than SELECT is not supported
WITH new_article AS (
    INSERT INTO articles_hash VALUES (1,  1, 'arsenous', 9572) RETURNING *
)
SELECT * FROM new_article;
ERROR:  cannot perform distributed planning for the given modification
DETAIL:  Data-modifying statements are not supported in the WITH clauses of distributed queries.
-- Modifying statement in nested CTE case is covered by PostgreSQL itself
WITH new_article AS (
    WITH nested_cte AS (
        INSERT INTO articles_hash VALUES (1,  1, 'arsenous', 9572) RETURNING *
    )
    SELECT * FROM nested_cte
)
SELECT * FROM new_article;
ERROR:  WITH clause containing a data-modifying statement must be at the top level
LINE 2:     WITH nested_cte AS (
                 ^
-- Modifying statement in a CTE in subquwey is also covered by PostgreSQL
SELECT * FROM (
    WITH new_article AS (
        INSERT INTO articles_hash VALUES (1,  1, 'arsenous', 9572) RETURNING *
    )
    SELECT * FROM new_article
) AS subquery_cte;
ERROR:  WITH clause containing a data-modifying statement must be at the top level
LINE 2:     WITH new_article AS (
                 ^
-- grouping sets are supported on single shard
SELECT
	id, substring(title, 2, 1) AS subtitle, count(*)
	FROM articles_hash
	WHERE author_id = 1 or author_id = 3
	GROUP BY GROUPING SETS ((id),(subtitle));
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | subtitle | count 
----+----------+-------
  1 |          |     1
  3 |          |     1
 11 |          |     1
 13 |          |     1
 21 |          |     1
 23 |          |     1
 31 |          |     1
 33 |          |     1
 41 |          |     1
 43 |          |     1
    | b        |     1
    | f        |     1
    | l        |     1
    | r        |     2
    | s        |     2
    | t        |     1
    | u        |     1
    | z        |     1
(18 rows)

-- grouping sets are not supported on multiple shards
SELECT
	id, substring(title, 2, 1) AS subtitle, count(*)
	FROM articles_hash
	WHERE author_id = 1 or author_id = 2
	GROUP BY GROUPING SETS ((id),(subtitle));
ERROR:  cannot perform distributed planning on this query
DETAIL:  Grouping sets, cube, and rollup is currently unsupported
-- queries which involve functions in FROM clause are supported if it goes to a single worker.
SELECT * FROM articles_hash, position('om' in 'Thomas') WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count | position 
----+-----------+--------------+------------+----------
  1 |         1 | arsenous     |       9572 |        3
 11 |         1 | alamo        |       1347 |        3
 21 |         1 | arcading     |       5890 |        3
 31 |         1 | athwartships |       7271 |        3
 41 |         1 | aznavour     |      11814 |        3
(5 rows)

SELECT * FROM articles_hash, position('om' in 'Thomas') WHERE author_id = 1 or author_id = 3;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count | position 
----+-----------+--------------+------------+----------
  1 |         1 | arsenous     |       9572 |        3
  3 |         3 | asternal     |      10480 |        3
 11 |         1 | alamo        |       1347 |        3
 13 |         3 | aseyev       |       2255 |        3
 21 |         1 | arcading     |       5890 |        3
 23 |         3 | abhorring    |       6799 |        3
 31 |         1 | athwartships |       7271 |        3
 33 |         3 | autochrome   |       8180 |        3
 41 |         1 | aznavour     |      11814 |        3
 43 |         3 | affixal      |      12723 |        3
(10 rows)

-- they are not supported if multiple workers are involved
SELECT * FROM articles_hash, position('om' in 'Thomas') WHERE author_id = 1 or author_id = 2;
ERROR:  cannot perform distributed planning on this query
DETAIL:  Complex table expressions are currently unsupported
-- subqueries are not supported in WHERE clause in Citus
SELECT * FROM articles_hash WHERE author_id IN (SELECT id FROM authors_hash WHERE name LIKE '%a');
ERROR:  cannot plan queries that include both regular and partitioned relations
SELECT * FROM articles_hash WHERE author_id IN (SELECT author_id FROM articles_hash WHERE author_id = 1 or author_id = 3);
ERROR:  cannot perform distributed planning on this query
DETAIL:  Join types other than inner/outer joins are currently unsupported
SELECT * FROM articles_hash WHERE author_id = (SELECT 1);
ERROR:  cannot perform distributed planning on this query
DETAIL:  Subqueries other than in from-clause are currently unsupported
-- unless the query can be transformed into a join
SELECT * FROM articles_hash
WHERE author_id IN (SELECT author_id FROM articles_hash WHERE author_id = 2)
ORDER BY articles_hash.id;
DEBUG:  predicate pruning for shardId 840000
DEBUG:  predicate pruning for shardId 840000
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |   title    | word_count 
----+-----------+------------+------------
  2 |         2 | abducing   |      13642
 12 |         2 | archiblast |      18185
 22 |         2 | antipope   |       2728
 32 |         2 | amazon     |      11342
 42 |         2 | ausable    |      15885
(5 rows)

-- subqueries are supported in FROM clause but they are not router plannable
SELECT articles_hash.id,test.word_count
FROM articles_hash, (SELECT id, word_count FROM articles_hash) AS test WHERE test.id = articles_hash.id
ORDER BY articles_hash.id;
DEBUG:  join prunable for task partitionId 0 and 1
DEBUG:  join prunable for task partitionId 0 and 2
DEBUG:  join prunable for task partitionId 0 and 3
DEBUG:  join prunable for task partitionId 1 and 0
DEBUG:  join prunable for task partitionId 1 and 2
DEBUG:  join prunable for task partitionId 1 and 3
DEBUG:  join prunable for task partitionId 2 and 0
DEBUG:  join prunable for task partitionId 2 and 1
DEBUG:  join prunable for task partitionId 2 and 3
DEBUG:  join prunable for task partitionId 3 and 0
DEBUG:  join prunable for task partitionId 3 and 1
DEBUG:  join prunable for task partitionId 3 and 2
DEBUG:  pruning merge fetch taskId 1
DETAIL:  Creating dependency on merge taskId 5
DEBUG:  pruning merge fetch taskId 2
DETAIL:  Creating dependency on merge taskId 5
DEBUG:  pruning merge fetch taskId 4
DETAIL:  Creating dependency on merge taskId 8
DEBUG:  pruning merge fetch taskId 5
DETAIL:  Creating dependency on merge taskId 8
DEBUG:  pruning merge fetch taskId 7
DETAIL:  Creating dependency on merge taskId 11
DEBUG:  pruning merge fetch taskId 8
DETAIL:  Creating dependency on merge taskId 11
DEBUG:  pruning merge fetch taskId 10
DETAIL:  Creating dependency on merge taskId 14
DEBUG:  pruning merge fetch taskId 11
DETAIL:  Creating dependency on merge taskId 14
ERROR:  cannot use real time executor with repartition jobs
HINT:  Set citus.task_executor_type to "task-tracker".
SELECT articles_hash.id,test.word_count
FROM articles_hash, (SELECT id, word_count FROM articles_hash) AS test 
WHERE test.id = articles_hash.id and articles_hash.author_id = 1
ORDER BY articles_hash.id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840001
DEBUG:  join prunable for task partitionId 0 and 1
DEBUG:  join prunable for task partitionId 0 and 2
DEBUG:  join prunable for task partitionId 0 and 3
DEBUG:  join prunable for task partitionId 1 and 0
DEBUG:  join prunable for task partitionId 1 and 2
DEBUG:  join prunable for task partitionId 1 and 3
DEBUG:  join prunable for task partitionId 2 and 0
DEBUG:  join prunable for task partitionId 2 and 1
DEBUG:  join prunable for task partitionId 2 and 3
DEBUG:  join prunable for task partitionId 3 and 0
DEBUG:  join prunable for task partitionId 3 and 1
DEBUG:  join prunable for task partitionId 3 and 2
DEBUG:  pruning merge fetch taskId 1
DETAIL:  Creating dependency on merge taskId 3
DEBUG:  pruning merge fetch taskId 2
DETAIL:  Creating dependency on merge taskId 5
DEBUG:  pruning merge fetch taskId 4
DETAIL:  Creating dependency on merge taskId 5
DEBUG:  pruning merge fetch taskId 5
DETAIL:  Creating dependency on merge taskId 8
DEBUG:  pruning merge fetch taskId 7
DETAIL:  Creating dependency on merge taskId 7
DEBUG:  pruning merge fetch taskId 8
DETAIL:  Creating dependency on merge taskId 11
DEBUG:  pruning merge fetch taskId 10
DETAIL:  Creating dependency on merge taskId 9
DEBUG:  pruning merge fetch taskId 11
DETAIL:  Creating dependency on merge taskId 14
ERROR:  cannot use real time executor with repartition jobs
HINT:  Set citus.task_executor_type to "task-tracker".
-- subqueries are not supported in SELECT clause
SELECT a.title AS name, (SELECT a2.id FROM articles_single_shard_hash a2 WHERE a.id = a2.id  LIMIT 1)
						 AS special_price FROM articles_hash a;
ERROR:  cannot perform distributed planning on this query
DETAIL:  Subqueries other than in from-clause are currently unsupported
-- simple lookup query
SELECT *
	FROM articles_hash
	WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- below query hits a single shard, router plannable
SELECT *
	FROM articles_hash
	WHERE author_id = 1 OR author_id = 17;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- below query hits two shards, not router plannable + not router executable
-- handled by real-time executor
SELECT *
	FROM articles_hash
	WHERE author_id = 1 OR author_id = 18;
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- rename the output columns
SELECT id as article_id, word_count * id as random_value
	FROM articles_hash
	WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 article_id | random_value 
------------+--------------
          1 |         9572
         11 |        14817
         21 |       123690
         31 |       225401
         41 |       484374
(5 rows)

-- we can push down co-located joins to a single worker
SELECT a.author_id as first_author, b.word_count as second_word_count
	FROM articles_hash a, articles_hash b
	WHERE a.author_id = 10 and a.author_id = b.author_id
	LIMIT 3;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 first_author | second_word_count 
--------------+-------------------
           10 |             17277
           10 |              1820
           10 |              6363
(3 rows)

-- following join is router plannable since the same worker 
-- has both shards
SELECT a.author_id as first_author, b.word_count as second_word_count
	FROM articles_hash a, articles_single_shard_hash b
	WHERE a.author_id = 10 and a.author_id = b.author_id
	LIMIT 3;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 first_author | second_word_count 
--------------+-------------------
           10 |             19519
           10 |             19519
           10 |             19519
(3 rows)

	
-- following join is not router plannable since there are no
-- workers containing both shards, added a CTE to make this fail
-- at logical planner
WITH single_shard as (SELECT * FROM articles_single_shard_hash)
SELECT a.author_id as first_author, b.word_count as second_word_count
	FROM articles_hash a, single_shard b
	WHERE a.author_id = 2 and a.author_id = b.author_id
	LIMIT 3;
DEBUG:  predicate pruning for shardId 840000
DEBUG:  Found no worker with all shard placements
ERROR:  cannot perform distributed planning on this query
DETAIL:  Complex table expressions are currently unsupported
-- single shard select with limit is router plannable
SELECT *
	FROM articles_hash
	WHERE author_id = 1
	LIMIT 3;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |  title   | word_count 
----+-----------+----------+------------
  1 |         1 | arsenous |       9572
 11 |         1 | alamo    |       1347
 21 |         1 | arcading |       5890
(3 rows)

-- single shard select with limit + offset is router plannable
SELECT *
	FROM articles_hash
	WHERE author_id = 1
	LIMIT 2
	OFFSET 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |  title   | word_count 
----+-----------+----------+------------
 11 |         1 | alamo    |       1347
 21 |         1 | arcading |       5890
(2 rows)

-- single shard select with limit + offset + order by is router plannable
SELECT *
	FROM articles_hash
	WHERE author_id = 1
	ORDER BY id desc
	LIMIT 2
	OFFSET 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
 31 |         1 | athwartships |       7271
 21 |         1 | arcading     |       5890
(2 rows)

	
-- single shard select with group by on non-partition column is router plannable
SELECT id
	FROM articles_hash
	WHERE author_id = 1
	GROUP BY id
	ORDER BY id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id 
----
  1
 11
 21
 31
 41
(5 rows)

-- single shard select with distinct is router plannable
SELECT DISTINCT id
	FROM articles_hash
	WHERE author_id = 1
	ORDER BY id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id 
----
  1
 11
 21
 31
 41
(5 rows)

-- single shard aggregate is router plannable
SELECT avg(word_count)
	FROM articles_hash
	WHERE author_id = 2;
DEBUG:  predicate pruning for shardId 840000
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
        avg         
--------------------
 12356.400000000000
(1 row)

-- max, min, sum, count are router plannable on single shard
SELECT max(word_count) as max, min(word_count) as min,
	   sum(word_count) as sum, count(word_count) as cnt
	FROM articles_hash
	WHERE author_id = 2;
DEBUG:  predicate pruning for shardId 840000
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
  max  | min  |  sum  | cnt 
-------+------+-------+-----
 18185 | 2728 | 61782 |   5
(1 row)

-- queries with aggregates and group by supported on single shard
SELECT max(word_count)
	FROM articles_hash
	WHERE author_id = 1
	GROUP BY author_id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
  max  
-------
 11814
(1 row)

	
-- router plannable union queries are supported
(SELECT * FROM articles_hash WHERE author_id = 1)
UNION
(SELECT * FROM articles_hash WHERE author_id = 3);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  3 |         3 | asternal     |      10480
 43 |         3 | affixal      |      12723
 23 |         3 | abhorring    |       6799
 13 |         3 | aseyev       |       2255
 11 |         1 | alamo        |       1347
 41 |         1 | aznavour     |      11814
  1 |         1 | arsenous     |       9572
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 33 |         3 | autochrome   |       8180
(10 rows)

SELECT * FROM (
	(SELECT * FROM articles_hash WHERE author_id = 1)
	UNION
	(SELECT * FROM articles_hash WHERE author_id = 3)) uu;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  3 |         3 | asternal     |      10480
 43 |         3 | affixal      |      12723
 23 |         3 | abhorring    |       6799
 13 |         3 | aseyev       |       2255
 11 |         1 | alamo        |       1347
 41 |         1 | aznavour     |      11814
  1 |         1 | arsenous     |       9572
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 33 |         3 | autochrome   |       8180
(10 rows)

(SELECT LEFT(title, 1) FROM articles_hash WHERE author_id = 1)
UNION
(SELECT LEFT(title, 1) FROM articles_hash WHERE author_id = 3);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 left 
------
 a
(1 row)

(SELECT LEFT(title, 1) FROM articles_hash WHERE author_id = 1)
INTERSECT
(SELECT LEFT(title, 1) FROM articles_hash WHERE author_id = 3);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 left 
------
 a
(1 row)

(SELECT LEFT(title, 2) FROM articles_hash WHERE author_id = 1)
EXCEPT
(SELECT LEFT(title, 2) FROM articles_hash WHERE author_id = 3);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 left 
------
 at
 az
 ar
 al
(4 rows)

-- union queries are not supported if not router plannable
-- there is an inconsistency on shard pruning between
-- ubuntu/mac disabling log messages for this queries only
SET client_min_messages to 'NOTICE';
(SELECT * FROM articles_hash WHERE author_id = 1)
UNION
(SELECT * FROM articles_hash WHERE author_id = 2);
ERROR:  cannot perform distributed planning on this query
DETAIL:  Union, Intersect, or Except are currently unsupported
SELECT * FROM (
	(SELECT * FROM articles_hash WHERE author_id = 1)
	UNION
	(SELECT * FROM articles_hash WHERE author_id = 2)) uu;
ERROR:  cannot perform distributed planning on this query
DETAIL:  Subqueries without group by clause are not supported yet
-- error out for queries with repartition jobs
SELECT *
	FROM articles_hash a, articles_hash b
	WHERE a.id = b.id  AND a.author_id = 1;
ERROR:  cannot use real time executor with repartition jobs
HINT:  Set citus.task_executor_type to "task-tracker".
-- queries which hit more than 1 shards are not router plannable or executable
-- handled by real-time executor
SELECT *
	FROM articles_hash
	WHERE author_id >= 1 AND author_id <= 3;
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
  3 |         3 | asternal     |      10480
 11 |         1 | alamo        |       1347
 13 |         3 | aseyev       |       2255
 21 |         1 | arcading     |       5890
 23 |         3 | abhorring    |       6799
 31 |         1 | athwartships |       7271
 33 |         3 | autochrome   |       8180
 41 |         1 | aznavour     |      11814
 43 |         3 | affixal      |      12723
  2 |         2 | abducing     |      13642
 12 |         2 | archiblast   |      18185
 22 |         2 | antipope     |       2728
 32 |         2 | amazon       |      11342
 42 |         2 | ausable      |      15885
(15 rows)

SET citus.task_executor_type TO 'real-time';
-- Test various filtering options for router plannable check
SET client_min_messages to 'DEBUG2';
-- this is definitely single shard
-- and router plannable
SELECT *
	FROM articles_hash
	WHERE author_id = 1 and author_id >= 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- not router plannable due to or
SELECT *
	FROM articles_hash
	WHERE author_id = 1 or id = 1;
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

	
-- router plannable
SELECT *
	FROM articles_hash
	WHERE author_id = 1 and (id = 1 or id = 41);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |  title   | word_count 
----+-----------+----------+------------
  1 |         1 | arsenous |       9572
 41 |         1 | aznavour |      11814
(2 rows)

-- router plannable
SELECT *
	FROM articles_hash
	WHERE author_id = 1 and (id = random()::int  * 0);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

-- not router plannable due to function call on the right side
SELECT *
	FROM articles_hash
	WHERE author_id = (random()::int  * 0 + 1);
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- not router plannable due to or
SELECT *
	FROM articles_hash
	WHERE author_id = 1 or id = 1;
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

	
-- router plannable due to abs(-1) getting converted to 1 by postgresql
SELECT *
	FROM articles_hash
	WHERE author_id = abs(-1);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- not router plannable due to abs() function
SELECT *
	FROM articles_hash
	WHERE 1 = abs(author_id);
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- not router plannable due to abs() function
SELECT *
	FROM articles_hash
	WHERE author_id = abs(author_id - 2);
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- router plannable, function on different field
SELECT *
	FROM articles_hash
	WHERE author_id = 1 and (id = abs(id - 2));
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |  title   | word_count 
----+-----------+----------+------------
  1 |         1 | arsenous |       9572
(1 row)

-- not router plannable due to is true
SELECT *
	FROM articles_hash
	WHERE (author_id = 1) is true;
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- router plannable, (boolean expression) = true is collapsed to (boolean expression)
SELECT *
	FROM articles_hash
	WHERE (author_id = 1) = true;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- router plannable, between operator is on another column
SELECT *
	FROM articles_hash
	WHERE (author_id = 1) and id between 0 and 20;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |  title   | word_count 
----+-----------+----------+------------
  1 |         1 | arsenous |       9572
 11 |         1 | alamo    |       1347
(2 rows)

-- router plannable, partition column expression is and'ed to rest
SELECT *
	FROM articles_hash
	WHERE (author_id = 1) and (id = 1 or id = 31) and title like '%s';
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 31 |         1 | athwartships |       7271
(2 rows)

-- router plannable, order is changed
SELECT *
	FROM articles_hash
	WHERE (id = 1 or id = 31) and title like '%s' and (author_id = 1);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 31 |         1 | athwartships |       7271
(2 rows)

-- router plannable
SELECT *
	FROM articles_hash
	WHERE (title like '%s' or title like 'a%') and (author_id = 1);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- router plannable
SELECT *
	FROM articles_hash
	WHERE (title like '%s' or title like 'a%') and (author_id = 1) and (word_count < 3000 or word_count > 8000);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |  title   | word_count 
----+-----------+----------+------------
  1 |         1 | arsenous |       9572
 11 |         1 | alamo    |       1347
 41 |         1 | aznavour |      11814
(3 rows)

-- window functions are supported if query is router plannable
SELECT LAG(title, 1) over (ORDER BY word_count) prev, title, word_count 
	FROM articles_hash
	WHERE author_id = 5;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
   prev   |  title   | word_count 
----------+----------+------------
          | afrasia  |        864
 afrasia  | adversa  |       3164
 adversa  | antehall |       7707
 antehall | aminate  |       9089
 aminate  | aruru    |      11389
(5 rows)

SELECT LAG(title, 1) over (ORDER BY word_count) prev, title, word_count 
	FROM articles_hash
	WHERE author_id = 5
	ORDER BY word_count DESC;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
   prev   |  title   | word_count 
----------+----------+------------
 aminate  | aruru    |      11389
 antehall | aminate  |       9089
 adversa  | antehall |       7707
 afrasia  | adversa  |       3164
          | afrasia  |        864
(5 rows)

SELECT id, MIN(id) over (order by word_count)
	FROM articles_hash
	WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | min 
----+-----
 11 |  11
 21 |  11
 31 |  11
  1 |   1
 41 |   1
(5 rows)

SELECT id, word_count, AVG(word_count) over (order by word_count)
	FROM articles_hash
	WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | word_count |          avg          
----+------------+-----------------------
 11 |       1347 | 1347.0000000000000000
 21 |       5890 | 3618.5000000000000000
 31 |       7271 | 4836.0000000000000000
  1 |       9572 | 6020.0000000000000000
 41 |      11814 | 7178.8000000000000000
(5 rows)

SELECT word_count, rank() OVER (PARTITION BY author_id ORDER BY word_count)  
	FROM articles_hash 
	WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 word_count | rank 
------------+------
       1347 |    1
       5890 |    2
       7271 |    3
       9572 |    4
      11814 |    5
(5 rows)

-- window functions are not supported for not router plannable queries
SELECT id, MIN(id) over (order by word_count)
	FROM articles_hash
	WHERE author_id = 1 or author_id = 2;
ERROR:  cannot perform distributed planning on this query
DETAIL:  Window functions are currently unsupported
SELECT LAG(title, 1) over (ORDER BY word_count) prev, title, word_count 
	FROM articles_hash
	WHERE author_id = 5 or author_id = 2;
ERROR:  cannot perform distributed planning on this query
DETAIL:  Window functions are currently unsupported
-- where false queries are router plannable
SELECT * 
	FROM articles_hash
	WHERE false;
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

SELECT * 
	FROM articles_hash
	WHERE author_id = 1 and false;
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

SELECT * 
	FROM articles_hash
	WHERE author_id = 1 and 1=0;
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

SELECT a.author_id as first_author, b.word_count as second_word_count
	FROM articles_hash a, articles_single_shard_hash b
	WHERE a.author_id = 10 and a.author_id = b.author_id and false;
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 first_author | second_word_count 
--------------+-------------------
(0 rows)

SELECT * 
	FROM articles_hash
	WHERE null;
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

-- where false with immutable function returning false
SELECT * 
	FROM articles_hash a
	WHERE a.author_id = 10 and int4eq(1, 2);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

SELECT * 
	FROM articles_hash a
	WHERE int4eq(1, 2);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

SELECT a.author_id as first_author, b.word_count as second_word_count
	FROM articles_hash a, articles_single_shard_hash b
	WHERE a.author_id = 10 and a.author_id = b.author_id and int4eq(1, 1);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 first_author | second_word_count 
--------------+-------------------
           10 |             19519
           10 |             19519
           10 |             19519
           10 |             19519
           10 |             19519
(5 rows)

SELECT a.author_id as first_author, b.word_count as second_word_count
	FROM articles_hash a, articles_single_shard_hash b
	WHERE a.author_id = 10 and a.author_id = b.author_id and int4eq(1, 2);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 first_author | second_word_count 
--------------+-------------------
(0 rows)

-- partition_column is null clause does not prune out any shards,
-- all shards remain after shard pruning, not router plannable
SELECT * 
	FROM articles_hash a
	WHERE a.author_id is null;
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

-- partition_column equals to null clause prunes out all shards
-- no shards after shard pruning, router plannable
SELECT * 
	FROM articles_hash a
	WHERE a.author_id = null;
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

-- stable function returning bool
SELECT * 
	FROM articles_hash a
	WHERE date_ne_timestamp('1954-04-11', '1954-04-11'::timestamp);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

SELECT a.author_id as first_author, b.word_count as second_word_count
	FROM articles_hash a, articles_single_shard_hash b
	WHERE a.author_id = 10 and a.author_id = b.author_id and
		date_ne_timestamp('1954-04-11', '1954-04-11'::timestamp);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 first_author | second_word_count 
--------------+-------------------
(0 rows)

-- union/difference /intersection with where false
-- this query was not originally router plannable, addition of 1=0
-- makes it router plannable
(SELECT * FROM articles_hash WHERE author_id = 1)
UNION
(SELECT * FROM articles_hash WHERE author_id = 2 and 1=0);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
 11 |         1 | alamo        |       1347
 41 |         1 | aznavour     |      11814
  1 |         1 | arsenous     |       9572
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
(5 rows)

(SELECT * FROM articles_hash WHERE author_id = 1)
EXCEPT
(SELECT * FROM articles_hash WHERE author_id = 2 and 1=0);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 11 |         1 | alamo        |       1347
 41 |         1 | aznavour     |      11814
(5 rows)

(SELECT * FROM articles_hash WHERE author_id = 1)
INTERSECT
(SELECT * FROM articles_hash WHERE author_id = 2 and 1=0);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

-- CTEs with where false
WITH id_author AS ( SELECT id, author_id FROM articles_hash WHERE author_id = 1),
id_title AS (SELECT id, title from articles_hash WHERE author_id = 1 and 1=0)
SELECT * FROM id_author, id_title WHERE id_author.id = id_title.id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | id | title 
----+-----------+----+-------
(0 rows)

WITH id_author AS ( SELECT id, author_id FROM articles_hash WHERE author_id = 1),
id_title AS (SELECT id, title from articles_hash WHERE author_id = 1)
SELECT * FROM id_author, id_title WHERE id_author.id = id_title.id and 1=0;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id | id | title 
----+-----------+----+-------
(0 rows)

WITH RECURSIVE hierarchy as (
	SELECT *, 1 AS level
		FROM company_employees
		WHERE company_id = 1 and manager_id = 0 
	UNION
	SELECT ce.*, (h.level+1)
		FROM hierarchy h JOIN company_employees ce
			ON (h.employee_id = ce.manager_id AND
				h.company_id = ce.company_id AND
				ce.company_id = 1))
SELECT * FROM hierarchy WHERE LEVEL <= 2 and 1=0;
DEBUG:  predicate pruning for shardId 840004
DEBUG:  predicate pruning for shardId 840005
DEBUG:  predicate pruning for shardId 840006
DEBUG:  predicate pruning for shardId 840004
DEBUG:  predicate pruning for shardId 840005
DEBUG:  predicate pruning for shardId 840006
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 company_id | employee_id | manager_id | level 
------------+-------------+------------+-------
(0 rows)

WITH RECURSIVE hierarchy as (
	SELECT *, 1 AS level
		FROM company_employees
		WHERE company_id = 1 and manager_id = 0 
	UNION
	SELECT ce.*, (h.level+1)
		FROM hierarchy h JOIN company_employees ce
			ON (h.employee_id = ce.manager_id AND
				h.company_id = ce.company_id AND
				ce.company_id = 1 AND 1=0))
SELECT * FROM hierarchy WHERE LEVEL <= 2;
DEBUG:  predicate pruning for shardId 840004
DEBUG:  predicate pruning for shardId 840005
DEBUG:  predicate pruning for shardId 840006
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 company_id | employee_id | manager_id | level 
------------+-------------+------------+-------
          1 |           1 |          0 |     1
(1 row)

WITH RECURSIVE hierarchy as (
	SELECT *, 1 AS level
		FROM company_employees
		WHERE company_id = 1 and manager_id = 0 AND 1=0
	UNION
	SELECT ce.*, (h.level+1)
		FROM hierarchy h JOIN company_employees ce
			ON (h.employee_id = ce.manager_id AND
				h.company_id = ce.company_id AND
				ce.company_id = 1))
SELECT * FROM hierarchy WHERE LEVEL <= 2;
DEBUG:  predicate pruning for shardId 840004
DEBUG:  predicate pruning for shardId 840005
DEBUG:  predicate pruning for shardId 840006
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 company_id | employee_id | manager_id | level 
------------+-------------+------------+-------
(0 rows)

-- window functions with where false
SELECT word_count, rank() OVER (PARTITION BY author_id ORDER BY word_count)  
	FROM articles_hash 
	WHERE author_id = 1 and 1=0;
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 word_count | rank 
------------+------
(0 rows)

-- function calls in WHERE clause with non-relational arguments
SELECT author_id FROM articles_hash
	WHERE 
		substring('hello world', 1, 5) = 'hello'
	ORDER BY
		author_id
	LIMIT 1;
DEBUG:  push down of limit count: 1
 author_id 
-----------
         1
(1 row)

-- when expression evaluates to false
SELECT author_id FROM articles_hash
	WHERE 
		substring('hello world', 1, 4) = 'hello'
	ORDER BY
		author_id
	LIMIT 1;
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 author_id 
-----------
(0 rows)

-- following is a bug, function should have been
-- evaluated at master before going to worker
-- need to use a range distributed table here
SELECT master_create_distributed_table('articles_range', 'author_id', 'range');
 master_create_distributed_table 
---------------------------------
 
(1 row)

SET citus.shard_replication_factor TO 1;
SELECT master_create_empty_shard('articles_range') AS shard_id \gset
UPDATE pg_dist_shard SET shardmaxvalue = 100, shardminvalue=1 WHERE shardid = :shard_id;
SELECT author_id FROM articles_range
	WHERE 
		substring('articles_range'::regclass::text, 1, 5) = 'hello'
	ORDER BY
		author_id
	LIMIT 1;
DEBUG:  push down of limit count: 1
WARNING:  relation "public.articles_range" does not exist
CONTEXT:  while executing command on localhost:57637
WARNING:  relation "public.articles_range" does not exist
CONTEXT:  while executing command on localhost:57637
WARNING:  relation "public.articles_range" does not exist
CONTEXT:  while executing command on localhost:57637
ERROR:  failed to execute job 840021
DETAIL:  Failure due to failed task 2
-- same query with where false but evaluation left to worker
SELECT author_id FROM articles_range
	WHERE 
		substring('articles_range'::regclass::text, 1, 4) = 'hello'
	ORDER BY
		author_id
	LIMIT 1;
DEBUG:  push down of limit count: 1
WARNING:  relation "public.articles_range" does not exist
CONTEXT:  while executing command on localhost:57637
WARNING:  relation "public.articles_range" does not exist
CONTEXT:  while executing command on localhost:57637
WARNING:  relation "public.articles_range" does not exist
CONTEXT:  while executing command on localhost:57637
ERROR:  failed to execute job 840022
DETAIL:  Failure due to failed task 2
-- same query on router planner with where false but evaluation left to worker
SELECT author_id FROM articles_single_shard_hash
	WHERE 
		substring('articles_single_shard_hash'::regclass::text, 1, 4) = 'hello'
	ORDER BY
		author_id
	LIMIT 1;
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
WARNING:  relation "public.articles_single_shard_hash" does not exist
CONTEXT:  while executing command on localhost:57637
ERROR:  could not receive query results
SELECT author_id FROM articles_hash
	WHERE 
		author_id = 1
		AND substring('articles_hash'::regclass::text, 1, 5) = 'hello'
	ORDER BY
		author_id
	LIMIT 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
WARNING:  relation "public.articles_hash" does not exist
CONTEXT:  while executing command on localhost:57637
ERROR:  could not receive query results
-- create a dummy function to be used in filtering
CREATE OR REPLACE FUNCTION someDummyFunction(regclass)
    RETURNS text AS
$$
BEGIN
    RETURN md5($1::text);
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE;
-- not router plannable, returns all rows 
SELECT * FROM articles_hash
	WHERE
		someDummyFunction('articles_hash') = md5('articles_hash')
	ORDER BY
		author_id, id
	LIMIT 5;
DEBUG:  push down of limit count: 5
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- router plannable, errors
SELECT * FROM articles_hash
	WHERE
		someDummyFunction('articles_hash') = md5('articles_hash') AND author_id = 1
	ORDER BY
		author_id, id
	LIMIT 5;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
WARNING:  relation "public.articles_hash" does not exist
CONTEXT:  while executing command on localhost:57637
ERROR:  could not receive query results
-- temporarily turn off debug messages before dropping the function
SET client_min_messages TO 'NOTICE';
DROP FUNCTION someDummyFunction(regclass);
SET client_min_messages TO 'DEBUG2';
-- complex query hitting a single shard 	
SELECT
	count(DISTINCT CASE
			WHEN 
				word_count > 100
			THEN
				id
			ELSE
				NULL
			END) as c
	FROM
		articles_hash
	WHERE
		author_id = 5;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 c 
---
 5
(1 row)

-- same query is not router plannable if hits multiple shards
SELECT
	count(DISTINCT CASE
			WHEN 
				word_count > 100
			THEN
				id
			ELSE
				NULL
			END) as c
	FROM
		articles_hash
 	GROUP BY
		author_id;
 c 
---
 4
 5
 5
 5
 5
 5
 5
 5
 5
 5
(10 rows)

-- queries inside transactions can be router plannable
BEGIN;
SELECT *
	FROM articles_hash
	WHERE author_id = 1
	ORDER BY id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

END;
-- cursor queries are router plannable
BEGIN;
DECLARE test_cursor CURSOR FOR 
	SELECT *
		FROM articles_hash
		WHERE author_id = 1
		ORDER BY id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
FETCH test_cursor;
 id | author_id |  title   | word_count 
----+-----------+----------+------------
  1 |         1 | arsenous |       9572
(1 row)

FETCH ALL test_cursor;
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(4 rows)

FETCH test_cursor; -- fetch one row after the last
 id | author_id | title | word_count 
----+-----------+-------+------------
(0 rows)

END;
-- queries inside copy can be router plannable
COPY (
	SELECT *
	FROM articles_hash
	WHERE author_id = 1
	ORDER BY id) TO STDOUT;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
1	1	arsenous	9572
11	1	alamo	1347
21	1	arcading	5890
31	1	athwartships	7271
41	1	aznavour	11814
	
-- table creation queries inside can be router plannable
CREATE TEMP TABLE temp_articles_hash as
	SELECT *
	FROM articles_hash
	WHERE author_id = 1
	ORDER BY id;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
-- router plannable queries may include filter for aggragates
SELECT count(*), count(*) FILTER (WHERE id < 3)
	FROM articles_hash
	WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 count | count 
-------+-------
     5 |     1
(1 row)

-- non-router plannable queries also support filters
SELECT count(*), count(*) FILTER (WHERE id < 3)
	FROM articles_hash
	WHERE author_id = 1 or author_id = 2;
 count | count 
-------+-------
    10 |     2
(1 row)

-- prepare queries can be router plannable
PREPARE author_1_articles as
	SELECT *
	FROM articles_hash
	WHERE author_id = 1;
EXECUTE author_1_articles;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- parametric prepare queries can be router plannable
PREPARE author_articles(int) as
	SELECT *
	FROM articles_hash
	WHERE author_id = $1;
EXECUTE author_articles(1);
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

-- queries inside plpgsql functions could be router plannable
CREATE OR REPLACE FUNCTION author_articles_max_id() RETURNS int AS $$
DECLARE
  max_id integer;
BEGIN
	SELECT MAX(id) FROM articles_hash ah
		WHERE author_id = 1
		into max_id;
	return max_id;
END;
$$ LANGUAGE plpgsql;
SELECT author_articles_max_id();
DEBUG:  predicate pruning for shardId 840001
CONTEXT:  SQL statement "SELECT MAX(id) FROM articles_hash ah
		WHERE author_id = 1"
PL/pgSQL function author_articles_max_id() line 5 at SQL statement
DEBUG:  predicate pruning for shardId 840001
CONTEXT:  SQL statement "SELECT MAX(id) FROM articles_hash ah
		WHERE author_id = 1"
PL/pgSQL function author_articles_max_id() line 5 at SQL statement
DEBUG:  predicate pruning for shardId 840001
CONTEXT:  SQL statement "SELECT MAX(id) FROM articles_hash ah
		WHERE author_id = 1"
PL/pgSQL function author_articles_max_id() line 5 at SQL statement
DEBUG:  Creating router plan
CONTEXT:  SQL statement "SELECT MAX(id) FROM articles_hash ah
		WHERE author_id = 1"
PL/pgSQL function author_articles_max_id() line 5 at SQL statement
DEBUG:  Plan is router executable
CONTEXT:  SQL statement "SELECT MAX(id) FROM articles_hash ah
		WHERE author_id = 1"
PL/pgSQL function author_articles_max_id() line 5 at SQL statement
 author_articles_max_id 
------------------------
                     41
(1 row)

-- check that function returning setof query are router plannable
CREATE OR REPLACE FUNCTION author_articles_id_word_count() RETURNS TABLE(id bigint, word_count int) AS $$
DECLARE
BEGIN
	RETURN QUERY
		SELECT ah.id, ah.word_count
		FROM articles_hash ah
		WHERE author_id = 1;

END;
$$ LANGUAGE plpgsql;
SELECT * FROM author_articles_id_word_count();
DEBUG:  predicate pruning for shardId 840001
CONTEXT:  SQL statement "SELECT ah.id, ah.word_count
		FROM articles_hash ah
		WHERE author_id = 1"
PL/pgSQL function author_articles_id_word_count() line 4 at RETURN QUERY
DEBUG:  Creating router plan
CONTEXT:  SQL statement "SELECT ah.id, ah.word_count
		FROM articles_hash ah
		WHERE author_id = 1"
PL/pgSQL function author_articles_id_word_count() line 4 at RETURN QUERY
DEBUG:  Plan is router executable
CONTEXT:  PL/pgSQL function author_articles_id_word_count() line 4 at RETURN QUERY
 id | word_count 
----+------------
  1 |       9572
 11 |       1347
 21 |       5890
 31 |       7271
 41 |      11814
(5 rows)

-- materialized views can be created for router plannable queries
CREATE MATERIALIZED VIEW mv_articles_hash AS
	SELECT * FROM articles_hash WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
SELECT * FROM mv_articles_hash;
 id | author_id |    title     | word_count 
----+-----------+--------------+------------
  1 |         1 | arsenous     |       9572
 11 |         1 | alamo        |       1347
 21 |         1 | arcading     |       5890
 31 |         1 | athwartships |       7271
 41 |         1 | aznavour     |      11814
(5 rows)

CREATE MATERIALIZED VIEW mv_articles_hash_error AS
	SELECT * FROM articles_hash WHERE author_id in (1,2);
NOTICE:  cannot use shard pruning with ANY/ALL (array expression)
HINT:  Consider rewriting the expression with OR/AND clauses.
NOTICE:  cannot use shard pruning with ANY/ALL (array expression)
HINT:  Consider rewriting the expression with OR/AND clauses.
ERROR:  cannot create temporary table within security-restricted operation
	
-- router planner/executor is now enabled for task-tracker executor
SET citus.task_executor_type to 'task-tracker';
SELECT id
	FROM articles_hash
	WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id 
----
  1
 11
 21
 31
 41
(5 rows)

-- insert query is router plannable even under task-tracker
INSERT INTO articles_hash VALUES (51,  1, 'amateus', 1814);
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
-- verify insert is successfull (not router plannable and executable)
SELECT id
	FROM articles_hash
	WHERE author_id = 1;
DEBUG:  predicate pruning for shardId 840001
DEBUG:  Creating router plan
DEBUG:  Plan is router executable
 id 
----
  1
 11
 21
 31
 41
 51
(6 rows)

SET client_min_messages to 'NOTICE';
DROP FUNCTION author_articles_max_id();
DROP FUNCTION author_articles_id_word_count();
DROP MATERIALIZED VIEW mv_articles_hash;
DROP TABLE articles_hash;
DROP TABLE articles_single_shard_hash;
DROP TABLE authors_hash;
DROP TABLE company_employees;
DROP TABLE articles_range;