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|
--
-- SUBSELECT
--
SELECT 1 AS one WHERE 1 IN (SELECT 1);
one
-----
1
(1 row)
SELECT 1 AS zero WHERE 1 NOT IN (SELECT 1);
zero
------
(0 rows)
SELECT 1 AS zero WHERE 1 IN (SELECT 2);
zero
------
(0 rows)
-- Set up some simple test tables
CREATE TABLE SUBSELECT_TBL (
f1 integer,
f2 integer,
f3 float
);
INSERT INTO SUBSELECT_TBL VALUES (1, 2, 3);
INSERT INTO SUBSELECT_TBL VALUES (2, 3, 4);
INSERT INTO SUBSELECT_TBL VALUES (3, 4, 5);
INSERT INTO SUBSELECT_TBL VALUES (1, 1, 1);
INSERT INTO SUBSELECT_TBL VALUES (2, 2, 2);
INSERT INTO SUBSELECT_TBL VALUES (3, 3, 3);
INSERT INTO SUBSELECT_TBL VALUES (6, 7, 8);
INSERT INTO SUBSELECT_TBL VALUES (8, 9, NULL);
SELECT '' AS eight, * FROM SUBSELECT_TBL;
eight | f1 | f2 | f3
-------+----+----+----
| 1 | 2 | 3
| 2 | 3 | 4
| 3 | 4 | 5
| 1 | 1 | 1
| 2 | 2 | 2
| 3 | 3 | 3
| 6 | 7 | 8
| 8 | 9 |
(8 rows)
-- Uncorrelated subselects
SELECT '' AS two, f1 AS "Constant Select" FROM SUBSELECT_TBL
WHERE f1 IN (SELECT 1);
two | Constant Select
-----+-----------------
| 1
| 1
(2 rows)
SELECT '' AS six, f1 AS "Uncorrelated Field" FROM SUBSELECT_TBL
WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL);
six | Uncorrelated Field
-----+--------------------
| 1
| 2
| 3
| 1
| 2
| 3
(6 rows)
SELECT '' AS six, f1 AS "Uncorrelated Field" FROM SUBSELECT_TBL
WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL WHERE
f2 IN (SELECT f1 FROM SUBSELECT_TBL));
six | Uncorrelated Field
-----+--------------------
| 1
| 2
| 3
| 1
| 2
| 3
(6 rows)
SELECT '' AS three, f1, f2
FROM SUBSELECT_TBL
WHERE (f1, f2) NOT IN (SELECT f2, CAST(f3 AS int4) FROM SUBSELECT_TBL
WHERE f3 IS NOT NULL);
three | f1 | f2
-------+----+----
| 1 | 2
| 6 | 7
| 8 | 9
(3 rows)
-- Correlated subselects
SELECT '' AS six, f1 AS "Correlated Field", f2 AS "Second Field"
FROM SUBSELECT_TBL upper
WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL WHERE f1 = upper.f1);
six | Correlated Field | Second Field
-----+------------------+--------------
| 1 | 2
| 2 | 3
| 3 | 4
| 1 | 1
| 2 | 2
| 3 | 3
(6 rows)
SELECT '' AS six, f1 AS "Correlated Field", f3 AS "Second Field"
FROM SUBSELECT_TBL upper
WHERE f1 IN
(SELECT f2 FROM SUBSELECT_TBL WHERE CAST(upper.f2 AS float) = f3);
six | Correlated Field | Second Field
-----+------------------+--------------
| 2 | 4
| 3 | 5
| 1 | 1
| 2 | 2
| 3 | 3
(5 rows)
SELECT '' AS six, f1 AS "Correlated Field", f3 AS "Second Field"
FROM SUBSELECT_TBL upper
WHERE f3 IN (SELECT upper.f1 + f2 FROM SUBSELECT_TBL
WHERE f2 = CAST(f3 AS integer));
six | Correlated Field | Second Field
-----+------------------+--------------
| 1 | 3
| 2 | 4
| 3 | 5
| 6 | 8
(4 rows)
SELECT '' AS five, f1 AS "Correlated Field"
FROM SUBSELECT_TBL
WHERE (f1, f2) IN (SELECT f2, CAST(f3 AS int4) FROM SUBSELECT_TBL
WHERE f3 IS NOT NULL);
five | Correlated Field
------+------------------
| 2
| 3
| 1
| 2
| 3
(5 rows)
--
-- Use some existing tables in the regression test
--
SELECT '' AS eight, ss.f1 AS "Correlated Field", ss.f3 AS "Second Field"
FROM SUBSELECT_TBL ss
WHERE f1 NOT IN (SELECT f1+1 FROM INT4_TBL
WHERE f1 != ss.f1 AND f1 < 2147483647);
eight | Correlated Field | Second Field
-------+------------------+--------------
| 2 | 4
| 3 | 5
| 2 | 2
| 3 | 3
| 6 | 8
| 8 |
(6 rows)
select q1, float8(count(*)) / (select count(*) from int8_tbl)
from int8_tbl group by q1 order by q1;
q1 | ?column?
------------------+----------
123 | 0.4
4567890123456789 | 0.6
(2 rows)
--
-- Test cases to catch unpleasant interactions between IN-join processing
-- and subquery pullup.
--
select count(*) from
(select 1 from tenk1 a
where unique1 IN (select hundred from tenk1 b)) ss;
count
-------
100
(1 row)
select count(distinct ss.ten) from
(select ten from tenk1 a
where unique1 IN (select hundred from tenk1 b)) ss;
count
-------
10
(1 row)
select count(*) from
(select 1 from tenk1 a
where unique1 IN (select distinct hundred from tenk1 b)) ss;
count
-------
100
(1 row)
select count(distinct ss.ten) from
(select ten from tenk1 a
where unique1 IN (select distinct hundred from tenk1 b)) ss;
count
-------
10
(1 row)
--
-- Test cases to check for overenthusiastic optimization of
-- "IN (SELECT DISTINCT ...)" and related cases. Per example from
-- Luca Pireddu and Michael Fuhr.
--
CREATE TEMP TABLE foo (id integer);
CREATE TEMP TABLE bar (id1 integer, id2 integer);
INSERT INTO foo VALUES (1);
INSERT INTO bar VALUES (1, 1);
INSERT INTO bar VALUES (2, 2);
INSERT INTO bar VALUES (3, 1);
-- These cases require an extra level of distinct-ing above subquery s
SELECT * FROM foo WHERE id IN
(SELECT id2 FROM (SELECT DISTINCT id1, id2 FROM bar) AS s);
id
----
1
(1 row)
SELECT * FROM foo WHERE id IN
(SELECT id2 FROM (SELECT id1,id2 FROM bar GROUP BY id1,id2) AS s);
id
----
1
(1 row)
SELECT * FROM foo WHERE id IN
(SELECT id2 FROM (SELECT id1, id2 FROM bar UNION
SELECT id1, id2 FROM bar) AS s);
id
----
1
(1 row)
-- These cases do not
SELECT * FROM foo WHERE id IN
(SELECT id2 FROM (SELECT DISTINCT ON (id2) id1, id2 FROM bar) AS s);
id
----
1
(1 row)
SELECT * FROM foo WHERE id IN
(SELECT id2 FROM (SELECT id2 FROM bar GROUP BY id2) AS s);
id
----
1
(1 row)
SELECT * FROM foo WHERE id IN
(SELECT id2 FROM (SELECT id2 FROM bar UNION
SELECT id2 FROM bar) AS s);
id
----
1
(1 row)
--
-- Test case to catch problems with multiply nested sub-SELECTs not getting
-- recalculated properly. Per bug report from Didier Moens.
--
CREATE TABLE orderstest (
approver_ref integer,
po_ref integer,
ordercancelled boolean
);
INSERT INTO orderstest VALUES (1, 1, false);
INSERT INTO orderstest VALUES (66, 5, false);
INSERT INTO orderstest VALUES (66, 6, false);
INSERT INTO orderstest VALUES (66, 7, false);
INSERT INTO orderstest VALUES (66, 1, true);
INSERT INTO orderstest VALUES (66, 8, false);
INSERT INTO orderstest VALUES (66, 1, false);
INSERT INTO orderstest VALUES (77, 1, false);
INSERT INTO orderstest VALUES (1, 1, false);
INSERT INTO orderstest VALUES (66, 1, false);
INSERT INTO orderstest VALUES (1, 1, false);
CREATE VIEW orders_view AS
SELECT *,
(SELECT CASE
WHEN ord.approver_ref=1 THEN '---' ELSE 'Approved'
END) AS "Approved",
(SELECT CASE
WHEN ord.ordercancelled
THEN 'Cancelled'
ELSE
(SELECT CASE
WHEN ord.po_ref=1
THEN
(SELECT CASE
WHEN ord.approver_ref=1
THEN '---'
ELSE 'Approved'
END)
ELSE 'PO'
END)
END) AS "Status",
(CASE
WHEN ord.ordercancelled
THEN 'Cancelled'
ELSE
(CASE
WHEN ord.po_ref=1
THEN
(CASE
WHEN ord.approver_ref=1
THEN '---'
ELSE 'Approved'
END)
ELSE 'PO'
END)
END) AS "Status_OK"
FROM orderstest ord;
SELECT * FROM orders_view;
approver_ref | po_ref | ordercancelled | Approved | Status | Status_OK
--------------+--------+----------------+----------+-----------+-----------
1 | 1 | f | --- | --- | ---
66 | 5 | f | Approved | PO | PO
66 | 6 | f | Approved | PO | PO
66 | 7 | f | Approved | PO | PO
66 | 1 | t | Approved | Cancelled | Cancelled
66 | 8 | f | Approved | PO | PO
66 | 1 | f | Approved | Approved | Approved
77 | 1 | f | Approved | Approved | Approved
1 | 1 | f | --- | --- | ---
66 | 1 | f | Approved | Approved | Approved
1 | 1 | f | --- | --- | ---
(11 rows)
DROP TABLE orderstest cascade;
NOTICE: drop cascades to rule _RETURN on view orders_view
NOTICE: drop cascades to view orders_view
--
-- Test cases to catch situations where rule rewriter fails to propagate
-- hasSubLinks flag correctly. Per example from Kyle Bateman.
--
create temp table parts (
partnum text,
cost float8
);
create temp table shipped (
ttype char(2),
ordnum int4,
partnum text,
value float8
);
create temp view shipped_view as
select * from shipped where ttype = 'wt';
create rule shipped_view_insert as on insert to shipped_view do instead
insert into shipped values('wt', new.ordnum, new.partnum, new.value);
insert into parts (partnum, cost) values (1, 1234.56);
insert into shipped_view (ordnum, partnum, value)
values (0, 1, (select cost from parts where partnum = '1'));
select * from shipped_view;
ttype | ordnum | partnum | value
-------+--------+---------+---------
wt | 0 | 1 | 1234.56
(1 row)
create rule shipped_view_update as on update to shipped_view do instead
update shipped set partnum = new.partnum, value = new.value
where ttype = new.ttype and ordnum = new.ordnum;
update shipped_view set value = 11
from int4_tbl a join int4_tbl b
on (a.f1 = (select f1 from int4_tbl c where c.f1=b.f1))
where ordnum = a.f1;
select * from shipped_view;
ttype | ordnum | partnum | value
-------+--------+---------+-------
wt | 0 | 1 | 11
(1 row)
select f1, ss1 as relabel from
(select *, (select sum(f1) from int4_tbl b where f1 >= a.f1) as ss1
from int4_tbl a) ss;
f1 | relabel
-------------+------------
0 | 2147607103
123456 | 2147607103
-123456 | 2147483647
2147483647 | 2147483647
-2147483647 | 0
(5 rows)
|
