CREATE SCHEMA subquery_append;
SET search_path TO subquery_append;
CREATE TABLE append_table (key text, value int, extra int default 0);
CREATE INDEX ON append_table (key);
SELECT create_distributed_table('append_table', 'key', 'append');
 create_distributed_table
---------------------------------------------------------------------

(1 row)

SELECT master_create_empty_shard('append_table') AS shardid1 \gset
SELECT master_create_empty_shard('append_table') AS shardid2 \gset
SELECT master_create_empty_shard('append_table') AS shardid3 \gset
CREATE TABLE ref_table (value int);
CREATE INDEX ON ref_table (value);
SELECT create_reference_table('ref_table');
 create_reference_table
---------------------------------------------------------------------

(1 row)

COPY append_table (key,value) FROM STDIN WITH (format 'csv', append_to_shard :shardid1);
COPY append_table (key,value) FROM STDIN WITH (format 'csv', append_to_shard :shardid2);
COPY ref_table FROM STDIN WITH CSV;
-- exercise some optimizer pushdown features with subqueries
SELECT count(*) FROM (SELECT random() FROM append_table) u;
 count
---------------------------------------------------------------------
    12
(1 row)

SELECT * FROM (SELECT DISTINCT key FROM append_table) sub ORDER BY 1 LIMIT 3;
 key
---------------------------------------------------------------------
 abc
 bcd
 cde
(3 rows)

SELECT DISTINCT key FROM (SELECT key FROM append_table) sub ORDER BY 1 LIMIT 3;
 key
---------------------------------------------------------------------
 abc
 bcd
 cde
(3 rows)

SELECT key, max(v) FROM (SELECT key, value + 1 AS v FROM append_table) sub GROUP BY key ORDER BY 1,2 LIMIT 3;
 key | max
---------------------------------------------------------------------
 abc | 235
 bcd | 235
 cde | 346
(3 rows)

SELECT v, max(key) FROM (SELECT key, value + 1 AS v FROM append_table) sub GROUP BY v ORDER BY 1,2 LIMIT 3;
  v  | max
---------------------------------------------------------------------
   1 | jkl
   2 | ijk
 124 | hij
(3 rows)

SELECT key, row_number() OVER (ORDER BY key, value) FROM (SELECT key, value, random() FROM append_table) sub ORDER BY 1,2 LIMIT 3;
 key | row_number
---------------------------------------------------------------------
 abc |          1
 abc |          2
 bcd |          3
(3 rows)

SELECT key, row_number() OVER (PARTITION BY key ORDER BY key,value) FROM (SELECT key, value, random() FROM append_table) sub ORDER BY 1,2 LIMIT 3;
 key | row_number
---------------------------------------------------------------------
 abc |          1
 abc |          2
 bcd |          1
(3 rows)

SELECT key, row_number() OVER (ORDER BY key, value) FROM (SELECT key, value, random() FROM append_table) sub ORDER BY 1,2 LIMIT 3;
 key | row_number
---------------------------------------------------------------------
 abc |          1
 abc |          2
 bcd |          3
(3 rows)

SELECT key, row_number() OVER (PARTITION BY key ORDER BY key,value) FROM (SELECT key, value, random() FROM append_table) sub ORDER BY 1,2 LIMIT 3;
 key | row_number
---------------------------------------------------------------------
 abc |          1
 abc |          2
 bcd |          1
(3 rows)

-- try some joins in subqueries
SELECT key, count(*) FROM (SELECT *, random() FROM append_table a JOIN append_table b USING (key)) u GROUP BY key ORDER BY 1,2 LIMIT 3;
ERROR:  the query contains a join that requires repartitioning
HINT:  Set citus.enable_repartition_joins to on to enable repartitioning
SELECT key, count(*) FROM (SELECT *, random() FROM append_table a JOIN ref_table b USING (value)) u GROUP BY key ORDER BY 1,2 LIMIT 3;
 key | count
---------------------------------------------------------------------
 abc |     1
 abc |     1
 bcd |     2
(3 rows)

SELECT key, value FROM append_table a WHERE value IN (SELECT * FROM ref_table) ORDER BY 1,2;
 key | value
---------------------------------------------------------------------
 abc |   123
 abc |   234
 bcd |   123
 bcd |   234
 cde |   345
 efg |   123
 efg |   234
 hij |   123
 hij |   234
(9 rows)

SELECT key, value FROM append_table a WHERE key IN (SELECT key FROM append_table WHERE value > 100) ORDER BY 1,2;
ERROR:  complex joins are only supported when all distributed tables are co-located and joined on their distribution columns
SELECT key, value FROM append_table a WHERE value = (SELECT max(value) FROM ref_table) ORDER BY 1,2;
 key | value
---------------------------------------------------------------------
 cde |   345
(1 row)

SELECT key, value FROM append_table a WHERE value = (SELECT max(value) FROM ref_table r WHERE a.value = r.value) ORDER BY 1,2;
 key | value
---------------------------------------------------------------------
 abc |   123
 abc |   234
 bcd |   123
 bcd |   234
 cde |   345
 efg |   123
 efg |   234
 hij |   123
 hij |   234
(9 rows)

SELECT key, (SELECT max(value) FROM ref_table r WHERE r.value = a.value) FROM append_table a ORDER BY 1,2;
 key | max
---------------------------------------------------------------------
 abc | 123
 abc | 234
 bcd | 123
 bcd | 234
 cde | 345
 def |
 efg | 123
 efg | 234
 hij | 123
 hij | 234
 ijk |
 jkl |
(12 rows)

-- Test delete
BEGIN;
DELETE FROM append_table a WHERE a.value IN (SELECT s FROM generate_series(1,100) s);
SELECT count(*) FROM append_table;
 count
---------------------------------------------------------------------
    11
(1 row)

DELETE FROM append_table a USING ref_table r WHERE a.value = r.value;
SELECT count(*) FROM append_table;
 count
---------------------------------------------------------------------
     2
(1 row)

DELETE FROM append_table WHERE value < 2;
SELECT count(*) FROM append_table;
 count
---------------------------------------------------------------------
     1
(1 row)

DELETE FROM append_table;
SELECT count(*) FROM append_table;
 count
---------------------------------------------------------------------
     0
(1 row)

DELETE FROM append_table a USING append_table b WHERE a.key = b.key;
ERROR:  complex joins are only supported when all distributed tables are co-located and joined on their distribution columns
END;
-- Test update
BEGIN;
UPDATE append_table a SET extra = 1 WHERE a.value IN (SELECT s FROM generate_series(1,100) s);
SELECT count(*) FROM append_table WHERE extra = 1;
 count
---------------------------------------------------------------------
     1
(1 row)

UPDATE append_table a SET extra = 1 FROM ref_table r WHERE a.value = r.value;
SELECT count(*) FROM append_table WHERE extra = 1;
 count
---------------------------------------------------------------------
    10
(1 row)

UPDATE append_table SET extra = 1 WHERE value < 2;
SELECT count(*) FROM append_table WHERE extra = 1;
 count
---------------------------------------------------------------------
    11
(1 row)

UPDATE append_table SET extra = 1;
SELECT count(*) FROM append_table WHERE extra = 1;
 count
---------------------------------------------------------------------
    12
(1 row)

UPDATE append_table a sET extra = 1 FROM append_table b WHERE a.key = b.key;
ERROR:  complex joins are only supported when all distributed tables are co-located and joined on their distribution columns
END;
DROP SCHEMA subquery_append CASCADE;
NOTICE:  drop cascades to 2 other objects
DETAIL:  drop cascades to table append_table
drop cascades to table ref_table