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e502150f7d
postgresql/src/test/regress/expected/join.out
David Rowley e502150f7d Allow Memoize to operate in binary comparison mode 
Memoize would always use the hash equality operator for the cache key
types to determine if the current set of parameters were the same as some
previously cached set.  Certain types such as floating points where -0.0
and +0.0 differ in their binary representation but are classed as equal by
the hash equality operator may cause problems as unless the join uses the
same operator it's possible that whichever join operator is being used
would be able to distinguish the two values.  In which case we may
accidentally return in the incorrect rows out of the cache.

To fix this here we add a binary mode to Memoize to allow it to the
current set of parameters to previously cached values by comparing
bit-by-bit rather than logically using the hash equality operator.  This
binary mode is always used for LATERAL joins and it's used for normal
joins when any of the join operators are not hashable.

Reported-by: Tom Lane
Author: David Rowley
Discussion: https://postgr.es/m/3004308.1632952496@sss.pgh.pa.us
Backpatch-through: 14, where Memoize was added
2021-11-24 10:06:59 +13:00

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--
-- JOIN
-- Test JOIN clauses
--
CREATE TABLE J1_TBL (
i integer,
j integer,
t text
);
CREATE TABLE J2_TBL (
i integer,
k integer
);
INSERT INTO J1_TBL VALUES (1, 4, 'one');
INSERT INTO J1_TBL VALUES (2, 3, 'two');
INSERT INTO J1_TBL VALUES (3, 2, 'three');
INSERT INTO J1_TBL VALUES (4, 1, 'four');
INSERT INTO J1_TBL VALUES (5, 0, 'five');
INSERT INTO J1_TBL VALUES (6, 6, 'six');
INSERT INTO J1_TBL VALUES (7, 7, 'seven');
INSERT INTO J1_TBL VALUES (8, 8, 'eight');
INSERT INTO J1_TBL VALUES (0, NULL, 'zero');
INSERT INTO J1_TBL VALUES (NULL, NULL, 'null');
INSERT INTO J1_TBL VALUES (NULL, 0, 'zero');
INSERT INTO J2_TBL VALUES (1, -1);
INSERT INTO J2_TBL VALUES (2, 2);
INSERT INTO J2_TBL VALUES (3, -3);
INSERT INTO J2_TBL VALUES (2, 4);
INSERT INTO J2_TBL VALUES (5, -5);
INSERT INTO J2_TBL VALUES (5, -5);
INSERT INTO J2_TBL VALUES (0, NULL);
INSERT INTO J2_TBL VALUES (NULL, NULL);
INSERT INTO J2_TBL VALUES (NULL, 0);
-- useful in some tests below
create temp table onerow();
insert into onerow default values;
analyze onerow;
--
-- CORRELATION NAMES
-- Make sure that table/column aliases are supported
-- before diving into more complex join syntax.
--
SELECT *
FROM J1_TBL AS tx;
i | j | t
---+---+-------
1 | 4 | one
2 | 3 | two
3 | 2 | three
4 | 1 | four
5 | 0 | five
6 | 6 | six
7 | 7 | seven
8 | 8 | eight
0 | | zero
| | null
| 0 | zero
(11 rows)
SELECT *
FROM J1_TBL tx;
i | j | t
---+---+-------
1 | 4 | one
2 | 3 | two
3 | 2 | three
4 | 1 | four
5 | 0 | five
6 | 6 | six
7 | 7 | seven
8 | 8 | eight
0 | | zero
| | null
| 0 | zero
(11 rows)
SELECT *
FROM J1_TBL AS t1 (a, b, c);
a | b | c
---+---+-------
1 | 4 | one
2 | 3 | two
3 | 2 | three
4 | 1 | four
5 | 0 | five
6 | 6 | six
7 | 7 | seven
8 | 8 | eight
0 | | zero
| | null
| 0 | zero
(11 rows)
SELECT *
FROM J1_TBL t1 (a, b, c);
a | b | c
---+---+-------
1 | 4 | one
2 | 3 | two
3 | 2 | three
4 | 1 | four
5 | 0 | five
6 | 6 | six
7 | 7 | seven
8 | 8 | eight
0 | | zero
| | null
| 0 | zero
(11 rows)
SELECT *
FROM J1_TBL t1 (a, b, c), J2_TBL t2 (d, e);
a | b | c | d | e
---+---+-------+---+----
1 | 4 | one | 1 | -1
2 | 3 | two | 1 | -1
3 | 2 | three | 1 | -1
4 | 1 | four | 1 | -1
5 | 0 | five | 1 | -1
6 | 6 | six | 1 | -1
7 | 7 | seven | 1 | -1
8 | 8 | eight | 1 | -1
0 | | zero | 1 | -1
| | null | 1 | -1
| 0 | zero | 1 | -1
1 | 4 | one | 2 | 2
2 | 3 | two | 2 | 2
3 | 2 | three | 2 | 2
4 | 1 | four | 2 | 2
5 | 0 | five | 2 | 2
6 | 6 | six | 2 | 2
7 | 7 | seven | 2 | 2
8 | 8 | eight | 2 | 2
0 | | zero | 2 | 2
| | null | 2 | 2
| 0 | zero | 2 | 2
1 | 4 | one | 3 | -3
2 | 3 | two | 3 | -3
3 | 2 | three | 3 | -3
4 | 1 | four | 3 | -3
5 | 0 | five | 3 | -3
6 | 6 | six | 3 | -3
7 | 7 | seven | 3 | -3
8 | 8 | eight | 3 | -3
0 | | zero | 3 | -3
| | null | 3 | -3
| 0 | zero | 3 | -3
1 | 4 | one | 2 | 4
2 | 3 | two | 2 | 4
3 | 2 | three | 2 | 4
4 | 1 | four | 2 | 4
5 | 0 | five | 2 | 4
6 | 6 | six | 2 | 4
7 | 7 | seven | 2 | 4
8 | 8 | eight | 2 | 4
0 | | zero | 2 | 4
| | null | 2 | 4
| 0 | zero | 2 | 4
1 | 4 | one | 5 | -5
2 | 3 | two | 5 | -5
3 | 2 | three | 5 | -5
4 | 1 | four | 5 | -5
5 | 0 | five | 5 | -5
6 | 6 | six | 5 | -5
7 | 7 | seven | 5 | -5
8 | 8 | eight | 5 | -5
0 | | zero | 5 | -5
| | null | 5 | -5
| 0 | zero | 5 | -5
1 | 4 | one | 5 | -5
2 | 3 | two | 5 | -5
3 | 2 | three | 5 | -5
4 | 1 | four | 5 | -5
5 | 0 | five | 5 | -5
6 | 6 | six | 5 | -5
7 | 7 | seven | 5 | -5
8 | 8 | eight | 5 | -5
0 | | zero | 5 | -5
| | null | 5 | -5
| 0 | zero | 5 | -5
1 | 4 | one | 0 |
2 | 3 | two | 0 |
3 | 2 | three | 0 |
4 | 1 | four | 0 |
5 | 0 | five | 0 |
6 | 6 | six | 0 |
7 | 7 | seven | 0 |
8 | 8 | eight | 0 |
0 | | zero | 0 |
| | null | 0 |
| 0 | zero | 0 |
1 | 4 | one | |
2 | 3 | two | |
3 | 2 | three | |
4 | 1 | four | |
5 | 0 | five | |
6 | 6 | six | |
7 | 7 | seven | |
8 | 8 | eight | |
0 | | zero | |
| | null | |
| 0 | zero | |
1 | 4 | one | | 0
2 | 3 | two | | 0
3 | 2 | three | | 0
4 | 1 | four | | 0
5 | 0 | five | | 0
6 | 6 | six | | 0
7 | 7 | seven | | 0
8 | 8 | eight | | 0
0 | | zero | | 0
| | null | | 0
| 0 | zero | | 0
(99 rows)
SELECT t1.a, t2.e
FROM J1_TBL t1 (a, b, c), J2_TBL t2 (d, e)
WHERE t1.a = t2.d;
a | e
---+----
0 |
1 | -1
2 | 2
2 | 4
3 | -3
5 | -5
5 | -5
(7 rows)
--
-- CROSS JOIN
-- Qualifications are not allowed on cross joins,
-- which degenerate into a standard unqualified inner join.
--
SELECT *
FROM J1_TBL CROSS JOIN J2_TBL;
i | j | t | i | k
---+---+-------+---+----
1 | 4 | one | 1 | -1
2 | 3 | two | 1 | -1
3 | 2 | three | 1 | -1
4 | 1 | four | 1 | -1
5 | 0 | five | 1 | -1
6 | 6 | six | 1 | -1
7 | 7 | seven | 1 | -1
8 | 8 | eight | 1 | -1
0 | | zero | 1 | -1
| | null | 1 | -1
| 0 | zero | 1 | -1
1 | 4 | one | 2 | 2
2 | 3 | two | 2 | 2
3 | 2 | three | 2 | 2
4 | 1 | four | 2 | 2
5 | 0 | five | 2 | 2
6 | 6 | six | 2 | 2
7 | 7 | seven | 2 | 2
8 | 8 | eight | 2 | 2
0 | | zero | 2 | 2
| | null | 2 | 2
| 0 | zero | 2 | 2
1 | 4 | one | 3 | -3
2 | 3 | two | 3 | -3
3 | 2 | three | 3 | -3
4 | 1 | four | 3 | -3
5 | 0 | five | 3 | -3
6 | 6 | six | 3 | -3
7 | 7 | seven | 3 | -3
8 | 8 | eight | 3 | -3
0 | | zero | 3 | -3
| | null | 3 | -3
| 0 | zero | 3 | -3
1 | 4 | one | 2 | 4
2 | 3 | two | 2 | 4
3 | 2 | three | 2 | 4
4 | 1 | four | 2 | 4
5 | 0 | five | 2 | 4
6 | 6 | six | 2 | 4
7 | 7 | seven | 2 | 4
8 | 8 | eight | 2 | 4
0 | | zero | 2 | 4
| | null | 2 | 4
| 0 | zero | 2 | 4
1 | 4 | one | 5 | -5
2 | 3 | two | 5 | -5
3 | 2 | three | 5 | -5
4 | 1 | four | 5 | -5
5 | 0 | five | 5 | -5
6 | 6 | six | 5 | -5
7 | 7 | seven | 5 | -5
8 | 8 | eight | 5 | -5
0 | | zero | 5 | -5
| | null | 5 | -5
| 0 | zero | 5 | -5
1 | 4 | one | 5 | -5
2 | 3 | two | 5 | -5
3 | 2 | three | 5 | -5
4 | 1 | four | 5 | -5
5 | 0 | five | 5 | -5
6 | 6 | six | 5 | -5
7 | 7 | seven | 5 | -5
8 | 8 | eight | 5 | -5
0 | | zero | 5 | -5
| | null | 5 | -5
| 0 | zero | 5 | -5
1 | 4 | one | 0 |
2 | 3 | two | 0 |
3 | 2 | three | 0 |
4 | 1 | four | 0 |
5 | 0 | five | 0 |
6 | 6 | six | 0 |
7 | 7 | seven | 0 |
8 | 8 | eight | 0 |
0 | | zero | 0 |
| | null | 0 |
| 0 | zero | 0 |
1 | 4 | one | |
2 | 3 | two | |
3 | 2 | three | |
4 | 1 | four | |
5 | 0 | five | |
6 | 6 | six | |
7 | 7 | seven | |
8 | 8 | eight | |
0 | | zero | |
| | null | |
| 0 | zero | |
1 | 4 | one | | 0
2 | 3 | two | | 0
3 | 2 | three | | 0
4 | 1 | four | | 0
5 | 0 | five | | 0
6 | 6 | six | | 0
7 | 7 | seven | | 0
8 | 8 | eight | | 0
0 | | zero | | 0
| | null | | 0
| 0 | zero | | 0
(99 rows)
-- ambiguous column
SELECT i, k, t
FROM J1_TBL CROSS JOIN J2_TBL;
ERROR: column reference "i" is ambiguous
LINE 1: SELECT i, k, t
^
-- resolve previous ambiguity by specifying the table name
SELECT t1.i, k, t
FROM J1_TBL t1 CROSS JOIN J2_TBL t2;
i | k | t
---+----+-------
1 | -1 | one
2 | -1 | two
3 | -1 | three
4 | -1 | four
5 | -1 | five
6 | -1 | six
7 | -1 | seven
8 | -1 | eight
0 | -1 | zero
| -1 | null
| -1 | zero
1 | 2 | one
2 | 2 | two
3 | 2 | three
4 | 2 | four
5 | 2 | five
6 | 2 | six
7 | 2 | seven
8 | 2 | eight
0 | 2 | zero
| 2 | null
| 2 | zero
1 | -3 | one
2 | -3 | two
3 | -3 | three
4 | -3 | four
5 | -3 | five
6 | -3 | six
7 | -3 | seven
8 | -3 | eight
0 | -3 | zero
| -3 | null
| -3 | zero
1 | 4 | one
2 | 4 | two
3 | 4 | three
4 | 4 | four
5 | 4 | five
6 | 4 | six
7 | 4 | seven
8 | 4 | eight
0 | 4 | zero
| 4 | null
| 4 | zero
1 | -5 | one
2 | -5 | two
3 | -5 | three
4 | -5 | four
5 | -5 | five
6 | -5 | six
7 | -5 | seven
8 | -5 | eight
0 | -5 | zero
| -5 | null
| -5 | zero
1 | -5 | one
2 | -5 | two
3 | -5 | three
4 | -5 | four
5 | -5 | five
6 | -5 | six
7 | -5 | seven
8 | -5 | eight
0 | -5 | zero
| -5 | null
| -5 | zero
1 | | one
2 | | two
3 | | three
4 | | four
5 | | five
6 | | six
7 | | seven
8 | | eight
0 | | zero
| | null
| | zero
1 | | one
2 | | two
3 | | three
4 | | four
5 | | five
6 | | six
7 | | seven
8 | | eight
0 | | zero
| | null
| | zero
1 | 0 | one
2 | 0 | two
3 | 0 | three
4 | 0 | four
5 | 0 | five
6 | 0 | six
7 | 0 | seven
8 | 0 | eight
0 | 0 | zero
| 0 | null
| 0 | zero
(99 rows)
SELECT ii, tt, kk
FROM (J1_TBL CROSS JOIN J2_TBL)
AS tx (ii, jj, tt, ii2, kk);
ii | tt | kk
----+-------+----
1 | one | -1
2 | two | -1
3 | three | -1
4 | four | -1
5 | five | -1
6 | six | -1
7 | seven | -1
8 | eight | -1
0 | zero | -1
| null | -1
| zero | -1
1 | one | 2
2 | two | 2
3 | three | 2
4 | four | 2
5 | five | 2
6 | six | 2
7 | seven | 2
8 | eight | 2
0 | zero | 2
| null | 2
| zero | 2
1 | one | -3
2 | two | -3
3 | three | -3
4 | four | -3
5 | five | -3
6 | six | -3
7 | seven | -3
8 | eight | -3
0 | zero | -3
| null | -3
| zero | -3
1 | one | 4
2 | two | 4
3 | three | 4
4 | four | 4
5 | five | 4
6 | six | 4
7 | seven | 4
8 | eight | 4
0 | zero | 4
| null | 4
| zero | 4
1 | one | -5
2 | two | -5
3 | three | -5
4 | four | -5
5 | five | -5
6 | six | -5
7 | seven | -5
8 | eight | -5
0 | zero | -5
| null | -5
| zero | -5
1 | one | -5
2 | two | -5
3 | three | -5
4 | four | -5
5 | five | -5
6 | six | -5
7 | seven | -5
8 | eight | -5
0 | zero | -5
| null | -5
| zero | -5
1 | one |
2 | two |
3 | three |
4 | four |
5 | five |
6 | six |
7 | seven |
8 | eight |
0 | zero |
| null |
| zero |
1 | one |
2 | two |
3 | three |
4 | four |
5 | five |
6 | six |
7 | seven |
8 | eight |
0 | zero |
| null |
| zero |
1 | one | 0
2 | two | 0
3 | three | 0
4 | four | 0
5 | five | 0
6 | six | 0
7 | seven | 0
8 | eight | 0
0 | zero | 0
| null | 0
| zero | 0
(99 rows)
SELECT tx.ii, tx.jj, tx.kk
FROM (J1_TBL t1 (a, b, c) CROSS JOIN J2_TBL t2 (d, e))
AS tx (ii, jj, tt, ii2, kk);
ii | jj | kk
----+----+----
1 | 4 | -1
2 | 3 | -1
3 | 2 | -1
4 | 1 | -1
5 | 0 | -1
6 | 6 | -1
7 | 7 | -1
8 | 8 | -1
0 | | -1
| | -1
| 0 | -1
1 | 4 | 2
2 | 3 | 2
3 | 2 | 2
4 | 1 | 2
5 | 0 | 2
6 | 6 | 2
7 | 7 | 2
8 | 8 | 2
0 | | 2
| | 2
| 0 | 2
1 | 4 | -3
2 | 3 | -3
3 | 2 | -3
4 | 1 | -3
5 | 0 | -3
6 | 6 | -3
7 | 7 | -3
8 | 8 | -3
0 | | -3
| | -3
| 0 | -3
1 | 4 | 4
2 | 3 | 4
3 | 2 | 4
4 | 1 | 4
5 | 0 | 4
6 | 6 | 4
7 | 7 | 4
8 | 8 | 4
0 | | 4
| | 4
| 0 | 4
1 | 4 | -5
2 | 3 | -5
3 | 2 | -5
4 | 1 | -5
5 | 0 | -5
6 | 6 | -5
7 | 7 | -5
8 | 8 | -5
0 | | -5
| | -5
| 0 | -5
1 | 4 | -5
2 | 3 | -5
3 | 2 | -5
4 | 1 | -5
5 | 0 | -5
6 | 6 | -5
7 | 7 | -5
8 | 8 | -5
0 | | -5
| | -5
| 0 | -5
1 | 4 |
2 | 3 |
3 | 2 |
4 | 1 |
5 | 0 |
6 | 6 |
7 | 7 |
8 | 8 |
0 | |
| |
| 0 |
1 | 4 |
2 | 3 |
3 | 2 |
4 | 1 |
5 | 0 |
6 | 6 |
7 | 7 |
8 | 8 |
0 | |
| |
| 0 |
1 | 4 | 0
2 | 3 | 0
3 | 2 | 0
4 | 1 | 0
5 | 0 | 0
6 | 6 | 0
7 | 7 | 0
8 | 8 | 0
0 | | 0
| | 0
| 0 | 0
(99 rows)
SELECT *
FROM J1_TBL CROSS JOIN J2_TBL a CROSS JOIN J2_TBL b;
i | j | t | i | k | i | k
---+---+-------+---+----+---+----
1 | 4 | one | 1 | -1 | 1 | -1
1 | 4 | one | 1 | -1 | 2 | 2
1 | 4 | one | 1 | -1 | 3 | -3
1 | 4 | one | 1 | -1 | 2 | 4
1 | 4 | one | 1 | -1 | 5 | -5
1 | 4 | one | 1 | -1 | 5 | -5
1 | 4 | one | 1 | -1 | 0 |
1 | 4 | one | 1 | -1 | |
1 | 4 | one | 1 | -1 | | 0
2 | 3 | two | 1 | -1 | 1 | -1
2 | 3 | two | 1 | -1 | 2 | 2
2 | 3 | two | 1 | -1 | 3 | -3
2 | 3 | two | 1 | -1 | 2 | 4
2 | 3 | two | 1 | -1 | 5 | -5
2 | 3 | two | 1 | -1 | 5 | -5
2 | 3 | two | 1 | -1 | 0 |
2 | 3 | two | 1 | -1 | |
2 | 3 | two | 1 | -1 | | 0
3 | 2 | three | 1 | -1 | 1 | -1
3 | 2 | three | 1 | -1 | 2 | 2
3 | 2 | three | 1 | -1 | 3 | -3
3 | 2 | three | 1 | -1 | 2 | 4
3 | 2 | three | 1 | -1 | 5 | -5
3 | 2 | three | 1 | -1 | 5 | -5
3 | 2 | three | 1 | -1 | 0 |
3 | 2 | three | 1 | -1 | |
3 | 2 | three | 1 | -1 | | 0
4 | 1 | four | 1 | -1 | 1 | -1
4 | 1 | four | 1 | -1 | 2 | 2
4 | 1 | four | 1 | -1 | 3 | -3
4 | 1 | four | 1 | -1 | 2 | 4
4 | 1 | four | 1 | -1 | 5 | -5
4 | 1 | four | 1 | -1 | 5 | -5
4 | 1 | four | 1 | -1 | 0 |
4 | 1 | four | 1 | -1 | |
4 | 1 | four | 1 | -1 | | 0
5 | 0 | five | 1 | -1 | 1 | -1
5 | 0 | five | 1 | -1 | 2 | 2
5 | 0 | five | 1 | -1 | 3 | -3
5 | 0 | five | 1 | -1 | 2 | 4
5 | 0 | five | 1 | -1 | 5 | -5
5 | 0 | five | 1 | -1 | 5 | -5
5 | 0 | five | 1 | -1 | 0 |
5 | 0 | five | 1 | -1 | |
5 | 0 | five | 1 | -1 | | 0
6 | 6 | six | 1 | -1 | 1 | -1
6 | 6 | six | 1 | -1 | 2 | 2
6 | 6 | six | 1 | -1 | 3 | -3
6 | 6 | six | 1 | -1 | 2 | 4
6 | 6 | six | 1 | -1 | 5 | -5
6 | 6 | six | 1 | -1 | 5 | -5
6 | 6 | six | 1 | -1 | 0 |
6 | 6 | six | 1 | -1 | |
6 | 6 | six | 1 | -1 | | 0
7 | 7 | seven | 1 | -1 | 1 | -1
7 | 7 | seven | 1 | -1 | 2 | 2
7 | 7 | seven | 1 | -1 | 3 | -3
7 | 7 | seven | 1 | -1 | 2 | 4
7 | 7 | seven | 1 | -1 | 5 | -5
7 | 7 | seven | 1 | -1 | 5 | -5
7 | 7 | seven | 1 | -1 | 0 |
7 | 7 | seven | 1 | -1 | |
7 | 7 | seven | 1 | -1 | | 0
8 | 8 | eight | 1 | -1 | 1 | -1
8 | 8 | eight | 1 | -1 | 2 | 2
8 | 8 | eight | 1 | -1 | 3 | -3
8 | 8 | eight | 1 | -1 | 2 | 4
8 | 8 | eight | 1 | -1 | 5 | -5
8 | 8 | eight | 1 | -1 | 5 | -5
8 | 8 | eight | 1 | -1 | 0 |
8 | 8 | eight | 1 | -1 | |
8 | 8 | eight | 1 | -1 | | 0
0 | | zero | 1 | -1 | 1 | -1
0 | | zero | 1 | -1 | 2 | 2
0 | | zero | 1 | -1 | 3 | -3
0 | | zero | 1 | -1 | 2 | 4
0 | | zero | 1 | -1 | 5 | -5
0 | | zero | 1 | -1 | 5 | -5
0 | | zero | 1 | -1 | 0 |
0 | | zero | 1 | -1 | |
0 | | zero | 1 | -1 | | 0
| | null | 1 | -1 | 1 | -1
| | null | 1 | -1 | 2 | 2
| | null | 1 | -1 | 3 | -3
| | null | 1 | -1 | 2 | 4
| | null | 1 | -1 | 5 | -5
| | null | 1 | -1 | 5 | -5
| | null | 1 | -1 | 0 |
| | null | 1 | -1 | |
| | null | 1 | -1 | | 0
| 0 | zero | 1 | -1 | 1 | -1
| 0 | zero | 1 | -1 | 2 | 2
| 0 | zero | 1 | -1 | 3 | -3
| 0 | zero | 1 | -1 | 2 | 4
| 0 | zero | 1 | -1 | 5 | -5
| 0 | zero | 1 | -1 | 5 | -5
| 0 | zero | 1 | -1 | 0 |
| 0 | zero | 1 | -1 | |
| 0 | zero | 1 | -1 | | 0
1 | 4 | one | 2 | 2 | 1 | -1
1 | 4 | one | 2 | 2 | 2 | 2
1 | 4 | one | 2 | 2 | 3 | -3
1 | 4 | one | 2 | 2 | 2 | 4
1 | 4 | one | 2 | 2 | 5 | -5
1 | 4 | one | 2 | 2 | 5 | -5
1 | 4 | one | 2 | 2 | 0 |
1 | 4 | one | 2 | 2 | |
1 | 4 | one | 2 | 2 | | 0
2 | 3 | two | 2 | 2 | 1 | -1
2 | 3 | two | 2 | 2 | 2 | 2
2 | 3 | two | 2 | 2 | 3 | -3
2 | 3 | two | 2 | 2 | 2 | 4
2 | 3 | two | 2 | 2 | 5 | -5
2 | 3 | two | 2 | 2 | 5 | -5
2 | 3 | two | 2 | 2 | 0 |
2 | 3 | two | 2 | 2 | |
2 | 3 | two | 2 | 2 | | 0
3 | 2 | three | 2 | 2 | 1 | -1
3 | 2 | three | 2 | 2 | 2 | 2
3 | 2 | three | 2 | 2 | 3 | -3
3 | 2 | three | 2 | 2 | 2 | 4
3 | 2 | three | 2 | 2 | 5 | -5
3 | 2 | three | 2 | 2 | 5 | -5
3 | 2 | three | 2 | 2 | 0 |
3 | 2 | three | 2 | 2 | |
3 | 2 | three | 2 | 2 | | 0
4 | 1 | four | 2 | 2 | 1 | -1
4 | 1 | four | 2 | 2 | 2 | 2
4 | 1 | four | 2 | 2 | 3 | -3
4 | 1 | four | 2 | 2 | 2 | 4
4 | 1 | four | 2 | 2 | 5 | -5
4 | 1 | four | 2 | 2 | 5 | -5
4 | 1 | four | 2 | 2 | 0 |
4 | 1 | four | 2 | 2 | |
4 | 1 | four | 2 | 2 | | 0
5 | 0 | five | 2 | 2 | 1 | -1
5 | 0 | five | 2 | 2 | 2 | 2
5 | 0 | five | 2 | 2 | 3 | -3
5 | 0 | five | 2 | 2 | 2 | 4
5 | 0 | five | 2 | 2 | 5 | -5
5 | 0 | five | 2 | 2 | 5 | -5
5 | 0 | five | 2 | 2 | 0 |
5 | 0 | five | 2 | 2 | |
5 | 0 | five | 2 | 2 | | 0
6 | 6 | six | 2 | 2 | 1 | -1
6 | 6 | six | 2 | 2 | 2 | 2
6 | 6 | six | 2 | 2 | 3 | -3
6 | 6 | six | 2 | 2 | 2 | 4
6 | 6 | six | 2 | 2 | 5 | -5
6 | 6 | six | 2 | 2 | 5 | -5
6 | 6 | six | 2 | 2 | 0 |
6 | 6 | six | 2 | 2 | |
6 | 6 | six | 2 | 2 | | 0
7 | 7 | seven | 2 | 2 | 1 | -1
7 | 7 | seven | 2 | 2 | 2 | 2
7 | 7 | seven | 2 | 2 | 3 | -3
7 | 7 | seven | 2 | 2 | 2 | 4
7 | 7 | seven | 2 | 2 | 5 | -5
7 | 7 | seven | 2 | 2 | 5 | -5
7 | 7 | seven | 2 | 2 | 0 |
7 | 7 | seven | 2 | 2 | |
7 | 7 | seven | 2 | 2 | | 0
8 | 8 | eight | 2 | 2 | 1 | -1
8 | 8 | eight | 2 | 2 | 2 | 2
8 | 8 | eight | 2 | 2 | 3 | -3
8 | 8 | eight | 2 | 2 | 2 | 4
8 | 8 | eight | 2 | 2 | 5 | -5
8 | 8 | eight | 2 | 2 | 5 | -5
8 | 8 | eight | 2 | 2 | 0 |
8 | 8 | eight | 2 | 2 | |
8 | 8 | eight | 2 | 2 | | 0
0 | | zero | 2 | 2 | 1 | -1
0 | | zero | 2 | 2 | 2 | 2
0 | | zero | 2 | 2 | 3 | -3
0 | | zero | 2 | 2 | 2 | 4
0 | | zero | 2 | 2 | 5 | -5
0 | | zero | 2 | 2 | 5 | -5
0 | | zero | 2 | 2 | 0 |
0 | | zero | 2 | 2 | |
0 | | zero | 2 | 2 | | 0
| | null | 2 | 2 | 1 | -1
| | null | 2 | 2 | 2 | 2
| | null | 2 | 2 | 3 | -3
| | null | 2 | 2 | 2 | 4
| | null | 2 | 2 | 5 | -5
| | null | 2 | 2 | 5 | -5
| | null | 2 | 2 | 0 |
| | null | 2 | 2 | |
| | null | 2 | 2 | | 0
| 0 | zero | 2 | 2 | 1 | -1
| 0 | zero | 2 | 2 | 2 | 2
| 0 | zero | 2 | 2 | 3 | -3
| 0 | zero | 2 | 2 | 2 | 4
| 0 | zero | 2 | 2 | 5 | -5
| 0 | zero | 2 | 2 | 5 | -5
| 0 | zero | 2 | 2 | 0 |
| 0 | zero | 2 | 2 | |
| 0 | zero | 2 | 2 | | 0
1 | 4 | one | 3 | -3 | 1 | -1
1 | 4 | one | 3 | -3 | 2 | 2
1 | 4 | one | 3 | -3 | 3 | -3
1 | 4 | one | 3 | -3 | 2 | 4
1 | 4 | one | 3 | -3 | 5 | -5
1 | 4 | one | 3 | -3 | 5 | -5
1 | 4 | one | 3 | -3 | 0 |
1 | 4 | one | 3 | -3 | |
1 | 4 | one | 3 | -3 | | 0
2 | 3 | two | 3 | -3 | 1 | -1
2 | 3 | two | 3 | -3 | 2 | 2
2 | 3 | two | 3 | -3 | 3 | -3
2 | 3 | two | 3 | -3 | 2 | 4
2 | 3 | two | 3 | -3 | 5 | -5
2 | 3 | two | 3 | -3 | 5 | -5
2 | 3 | two | 3 | -3 | 0 |
2 | 3 | two | 3 | -3 | |
2 | 3 | two | 3 | -3 | | 0
3 | 2 | three | 3 | -3 | 1 | -1
3 | 2 | three | 3 | -3 | 2 | 2
3 | 2 | three | 3 | -3 | 3 | -3
3 | 2 | three | 3 | -3 | 2 | 4
3 | 2 | three | 3 | -3 | 5 | -5
3 | 2 | three | 3 | -3 | 5 | -5
3 | 2 | three | 3 | -3 | 0 |
3 | 2 | three | 3 | -3 | |
3 | 2 | three | 3 | -3 | | 0
4 | 1 | four | 3 | -3 | 1 | -1
4 | 1 | four | 3 | -3 | 2 | 2
4 | 1 | four | 3 | -3 | 3 | -3
4 | 1 | four | 3 | -3 | 2 | 4
4 | 1 | four | 3 | -3 | 5 | -5
4 | 1 | four | 3 | -3 | 5 | -5
4 | 1 | four | 3 | -3 | 0 |
4 | 1 | four | 3 | -3 | |
4 | 1 | four | 3 | -3 | | 0
5 | 0 | five | 3 | -3 | 1 | -1
5 | 0 | five | 3 | -3 | 2 | 2
5 | 0 | five | 3 | -3 | 3 | -3
5 | 0 | five | 3 | -3 | 2 | 4
5 | 0 | five | 3 | -3 | 5 | -5
5 | 0 | five | 3 | -3 | 5 | -5
5 | 0 | five | 3 | -3 | 0 |
5 | 0 | five | 3 | -3 | |
5 | 0 | five | 3 | -3 | | 0
6 | 6 | six | 3 | -3 | 1 | -1
6 | 6 | six | 3 | -3 | 2 | 2
6 | 6 | six | 3 | -3 | 3 | -3
6 | 6 | six | 3 | -3 | 2 | 4
6 | 6 | six | 3 | -3 | 5 | -5
6 | 6 | six | 3 | -3 | 5 | -5
6 | 6 | six | 3 | -3 | 0 |
6 | 6 | six | 3 | -3 | |
6 | 6 | six | 3 | -3 | | 0
7 | 7 | seven | 3 | -3 | 1 | -1
7 | 7 | seven | 3 | -3 | 2 | 2
7 | 7 | seven | 3 | -3 | 3 | -3
7 | 7 | seven | 3 | -3 | 2 | 4
7 | 7 | seven | 3 | -3 | 5 | -5
7 | 7 | seven | 3 | -3 | 5 | -5
7 | 7 | seven | 3 | -3 | 0 |
7 | 7 | seven | 3 | -3 | |
7 | 7 | seven | 3 | -3 | | 0
8 | 8 | eight | 3 | -3 | 1 | -1
8 | 8 | eight | 3 | -3 | 2 | 2
8 | 8 | eight | 3 | -3 | 3 | -3
8 | 8 | eight | 3 | -3 | 2 | 4
8 | 8 | eight | 3 | -3 | 5 | -5
8 | 8 | eight | 3 | -3 | 5 | -5
8 | 8 | eight | 3 | -3 | 0 |
8 | 8 | eight | 3 | -3 | |
8 | 8 | eight | 3 | -3 | | 0
0 | | zero | 3 | -3 | 1 | -1
0 | | zero | 3 | -3 | 2 | 2
0 | | zero | 3 | -3 | 3 | -3
0 | | zero | 3 | -3 | 2 | 4
0 | | zero | 3 | -3 | 5 | -5
0 | | zero | 3 | -3 | 5 | -5
0 | | zero | 3 | -3 | 0 |
0 | | zero | 3 | -3 | |
0 | | zero | 3 | -3 | | 0
| | null | 3 | -3 | 1 | -1
| | null | 3 | -3 | 2 | 2
| | null | 3 | -3 | 3 | -3
| | null | 3 | -3 | 2 | 4
| | null | 3 | -3 | 5 | -5
| | null | 3 | -3 | 5 | -5
| | null | 3 | -3 | 0 |
| | null | 3 | -3 | |
| | null | 3 | -3 | | 0
| 0 | zero | 3 | -3 | 1 | -1
| 0 | zero | 3 | -3 | 2 | 2
| 0 | zero | 3 | -3 | 3 | -3
| 0 | zero | 3 | -3 | 2 | 4
| 0 | zero | 3 | -3 | 5 | -5
| 0 | zero | 3 | -3 | 5 | -5
| 0 | zero | 3 | -3 | 0 |
| 0 | zero | 3 | -3 | |
| 0 | zero | 3 | -3 | | 0
1 | 4 | one | 2 | 4 | 1 | -1
1 | 4 | one | 2 | 4 | 2 | 2
1 | 4 | one | 2 | 4 | 3 | -3
1 | 4 | one | 2 | 4 | 2 | 4
1 | 4 | one | 2 | 4 | 5 | -5
1 | 4 | one | 2 | 4 | 5 | -5
1 | 4 | one | 2 | 4 | 0 |
1 | 4 | one | 2 | 4 | |
1 | 4 | one | 2 | 4 | | 0
2 | 3 | two | 2 | 4 | 1 | -1
2 | 3 | two | 2 | 4 | 2 | 2
2 | 3 | two | 2 | 4 | 3 | -3
2 | 3 | two | 2 | 4 | 2 | 4
2 | 3 | two | 2 | 4 | 5 | -5
2 | 3 | two | 2 | 4 | 5 | -5
2 | 3 | two | 2 | 4 | 0 |
2 | 3 | two | 2 | 4 | |
2 | 3 | two | 2 | 4 | | 0
3 | 2 | three | 2 | 4 | 1 | -1
3 | 2 | three | 2 | 4 | 2 | 2
3 | 2 | three | 2 | 4 | 3 | -3
3 | 2 | three | 2 | 4 | 2 | 4
3 | 2 | three | 2 | 4 | 5 | -5
3 | 2 | three | 2 | 4 | 5 | -5
3 | 2 | three | 2 | 4 | 0 |
3 | 2 | three | 2 | 4 | |
3 | 2 | three | 2 | 4 | | 0
4 | 1 | four | 2 | 4 | 1 | -1
4 | 1 | four | 2 | 4 | 2 | 2
4 | 1 | four | 2 | 4 | 3 | -3
4 | 1 | four | 2 | 4 | 2 | 4
4 | 1 | four | 2 | 4 | 5 | -5
4 | 1 | four | 2 | 4 | 5 | -5
4 | 1 | four | 2 | 4 | 0 |
4 | 1 | four | 2 | 4 | |
4 | 1 | four | 2 | 4 | | 0
5 | 0 | five | 2 | 4 | 1 | -1
5 | 0 | five | 2 | 4 | 2 | 2
5 | 0 | five | 2 | 4 | 3 | -3
5 | 0 | five | 2 | 4 | 2 | 4
5 | 0 | five | 2 | 4 | 5 | -5
5 | 0 | five | 2 | 4 | 5 | -5
5 | 0 | five | 2 | 4 | 0 |
5 | 0 | five | 2 | 4 | |
5 | 0 | five | 2 | 4 | | 0
6 | 6 | six | 2 | 4 | 1 | -1
6 | 6 | six | 2 | 4 | 2 | 2
6 | 6 | six | 2 | 4 | 3 | -3
6 | 6 | six | 2 | 4 | 2 | 4
6 | 6 | six | 2 | 4 | 5 | -5
6 | 6 | six | 2 | 4 | 5 | -5
6 | 6 | six | 2 | 4 | 0 |
6 | 6 | six | 2 | 4 | |
6 | 6 | six | 2 | 4 | | 0
7 | 7 | seven | 2 | 4 | 1 | -1
7 | 7 | seven | 2 | 4 | 2 | 2
7 | 7 | seven | 2 | 4 | 3 | -3
7 | 7 | seven | 2 | 4 | 2 | 4
7 | 7 | seven | 2 | 4 | 5 | -5
7 | 7 | seven | 2 | 4 | 5 | -5
7 | 7 | seven | 2 | 4 | 0 |
7 | 7 | seven | 2 | 4 | |
7 | 7 | seven | 2 | 4 | | 0
8 | 8 | eight | 2 | 4 | 1 | -1
8 | 8 | eight | 2 | 4 | 2 | 2
8 | 8 | eight | 2 | 4 | 3 | -3
8 | 8 | eight | 2 | 4 | 2 | 4
8 | 8 | eight | 2 | 4 | 5 | -5
8 | 8 | eight | 2 | 4 | 5 | -5
8 | 8 | eight | 2 | 4 | 0 |
8 | 8 | eight | 2 | 4 | |
8 | 8 | eight | 2 | 4 | | 0
0 | | zero | 2 | 4 | 1 | -1
0 | | zero | 2 | 4 | 2 | 2
0 | | zero | 2 | 4 | 3 | -3
0 | | zero | 2 | 4 | 2 | 4
0 | | zero | 2 | 4 | 5 | -5
0 | | zero | 2 | 4 | 5 | -5
0 | | zero | 2 | 4 | 0 |
0 | | zero | 2 | 4 | |
0 | | zero | 2 | 4 | | 0
| | null | 2 | 4 | 1 | -1
| | null | 2 | 4 | 2 | 2
| | null | 2 | 4 | 3 | -3
| | null | 2 | 4 | 2 | 4
| | null | 2 | 4 | 5 | -5
| | null | 2 | 4 | 5 | -5
| | null | 2 | 4 | 0 |
| | null | 2 | 4 | |
| | null | 2 | 4 | | 0
| 0 | zero | 2 | 4 | 1 | -1
| 0 | zero | 2 | 4 | 2 | 2
| 0 | zero | 2 | 4 | 3 | -3
| 0 | zero | 2 | 4 | 2 | 4
| 0 | zero | 2 | 4 | 5 | -5
| 0 | zero | 2 | 4 | 5 | -5
| 0 | zero | 2 | 4 | 0 |
| 0 | zero | 2 | 4 | |
| 0 | zero | 2 | 4 | | 0
1 | 4 | one | 5 | -5 | 1 | -1
1 | 4 | one | 5 | -5 | 2 | 2
1 | 4 | one | 5 | -5 | 3 | -3
1 | 4 | one | 5 | -5 | 2 | 4
1 | 4 | one | 5 | -5 | 5 | -5
1 | 4 | one | 5 | -5 | 5 | -5
1 | 4 | one | 5 | -5 | 0 |
1 | 4 | one | 5 | -5 | |
1 | 4 | one | 5 | -5 | | 0
2 | 3 | two | 5 | -5 | 1 | -1
2 | 3 | two | 5 | -5 | 2 | 2
2 | 3 | two | 5 | -5 | 3 | -3
2 | 3 | two | 5 | -5 | 2 | 4
2 | 3 | two | 5 | -5 | 5 | -5
2 | 3 | two | 5 | -5 | 5 | -5
2 | 3 | two | 5 | -5 | 0 |
2 | 3 | two | 5 | -5 | |
2 | 3 | two | 5 | -5 | | 0
3 | 2 | three | 5 | -5 | 1 | -1
3 | 2 | three | 5 | -5 | 2 | 2
3 | 2 | three | 5 | -5 | 3 | -3
3 | 2 | three | 5 | -5 | 2 | 4
3 | 2 | three | 5 | -5 | 5 | -5
3 | 2 | three | 5 | -5 | 5 | -5
3 | 2 | three | 5 | -5 | 0 |
3 | 2 | three | 5 | -5 | |
3 | 2 | three | 5 | -5 | | 0
4 | 1 | four | 5 | -5 | 1 | -1
4 | 1 | four | 5 | -5 | 2 | 2
4 | 1 | four | 5 | -5 | 3 | -3
4 | 1 | four | 5 | -5 | 2 | 4
4 | 1 | four | 5 | -5 | 5 | -5
4 | 1 | four | 5 | -5 | 5 | -5
4 | 1 | four | 5 | -5 | 0 |
4 | 1 | four | 5 | -5 | |
4 | 1 | four | 5 | -5 | | 0
5 | 0 | five | 5 | -5 | 1 | -1
5 | 0 | five | 5 | -5 | 2 | 2
5 | 0 | five | 5 | -5 | 3 | -3
5 | 0 | five | 5 | -5 | 2 | 4
5 | 0 | five | 5 | -5 | 5 | -5
5 | 0 | five | 5 | -5 | 5 | -5
5 | 0 | five | 5 | -5 | 0 |
5 | 0 | five | 5 | -5 | |
5 | 0 | five | 5 | -5 | | 0
6 | 6 | six | 5 | -5 | 1 | -1
6 | 6 | six | 5 | -5 | 2 | 2
6 | 6 | six | 5 | -5 | 3 | -3
6 | 6 | six | 5 | -5 | 2 | 4
6 | 6 | six | 5 | -5 | 5 | -5
6 | 6 | six | 5 | -5 | 5 | -5
6 | 6 | six | 5 | -5 | 0 |
6 | 6 | six | 5 | -5 | |
6 | 6 | six | 5 | -5 | | 0
7 | 7 | seven | 5 | -5 | 1 | -1
7 | 7 | seven | 5 | -5 | 2 | 2
7 | 7 | seven | 5 | -5 | 3 | -3
7 | 7 | seven | 5 | -5 | 2 | 4
7 | 7 | seven | 5 | -5 | 5 | -5
7 | 7 | seven | 5 | -5 | 5 | -5
7 | 7 | seven | 5 | -5 | 0 |
7 | 7 | seven | 5 | -5 | |
7 | 7 | seven | 5 | -5 | | 0
8 | 8 | eight | 5 | -5 | 1 | -1
8 | 8 | eight | 5 | -5 | 2 | 2
8 | 8 | eight | 5 | -5 | 3 | -3
8 | 8 | eight | 5 | -5 | 2 | 4
8 | 8 | eight | 5 | -5 | 5 | -5
8 | 8 | eight | 5 | -5 | 5 | -5
8 | 8 | eight | 5 | -5 | 0 |
8 | 8 | eight | 5 | -5 | |
8 | 8 | eight | 5 | -5 | | 0
0 | | zero | 5 | -5 | 1 | -1
0 | | zero | 5 | -5 | 2 | 2
0 | | zero | 5 | -5 | 3 | -3
0 | | zero | 5 | -5 | 2 | 4
0 | | zero | 5 | -5 | 5 | -5
0 | | zero | 5 | -5 | 5 | -5
0 | | zero | 5 | -5 | 0 |
0 | | zero | 5 | -5 | |
0 | | zero | 5 | -5 | | 0
| | null | 5 | -5 | 1 | -1
| | null | 5 | -5 | 2 | 2
| | null | 5 | -5 | 3 | -3
| | null | 5 | -5 | 2 | 4
| | null | 5 | -5 | 5 | -5
| | null | 5 | -5 | 5 | -5
| | null | 5 | -5 | 0 |
| | null | 5 | -5 | |
| | null | 5 | -5 | | 0
| 0 | zero | 5 | -5 | 1 | -1
| 0 | zero | 5 | -5 | 2 | 2
| 0 | zero | 5 | -5 | 3 | -3
| 0 | zero | 5 | -5 | 2 | 4
| 0 | zero | 5 | -5 | 5 | -5
| 0 | zero | 5 | -5 | 5 | -5
| 0 | zero | 5 | -5 | 0 |
| 0 | zero | 5 | -5 | |
| 0 | zero | 5 | -5 | | 0
1 | 4 | one | 5 | -5 | 1 | -1
1 | 4 | one | 5 | -5 | 2 | 2
1 | 4 | one | 5 | -5 | 3 | -3
1 | 4 | one | 5 | -5 | 2 | 4
1 | 4 | one | 5 | -5 | 5 | -5
1 | 4 | one | 5 | -5 | 5 | -5
1 | 4 | one | 5 | -5 | 0 |
1 | 4 | one | 5 | -5 | |
1 | 4 | one | 5 | -5 | | 0
2 | 3 | two | 5 | -5 | 1 | -1
2 | 3 | two | 5 | -5 | 2 | 2
2 | 3 | two | 5 | -5 | 3 | -3
2 | 3 | two | 5 | -5 | 2 | 4
2 | 3 | two | 5 | -5 | 5 | -5
2 | 3 | two | 5 | -5 | 5 | -5
2 | 3 | two | 5 | -5 | 0 |
2 | 3 | two | 5 | -5 | |
2 | 3 | two | 5 | -5 | | 0
3 | 2 | three | 5 | -5 | 1 | -1
3 | 2 | three | 5 | -5 | 2 | 2
3 | 2 | three | 5 | -5 | 3 | -3
3 | 2 | three | 5 | -5 | 2 | 4
3 | 2 | three | 5 | -5 | 5 | -5
3 | 2 | three | 5 | -5 | 5 | -5
3 | 2 | three | 5 | -5 | 0 |
3 | 2 | three | 5 | -5 | |
3 | 2 | three | 5 | -5 | | 0
4 | 1 | four | 5 | -5 | 1 | -1
4 | 1 | four | 5 | -5 | 2 | 2
4 | 1 | four | 5 | -5 | 3 | -3
4 | 1 | four | 5 | -5 | 2 | 4
4 | 1 | four | 5 | -5 | 5 | -5
4 | 1 | four | 5 | -5 | 5 | -5
4 | 1 | four | 5 | -5 | 0 |
4 | 1 | four | 5 | -5 | |
4 | 1 | four | 5 | -5 | | 0
5 | 0 | five | 5 | -5 | 1 | -1
5 | 0 | five | 5 | -5 | 2 | 2
5 | 0 | five | 5 | -5 | 3 | -3
5 | 0 | five | 5 | -5 | 2 | 4
5 | 0 | five | 5 | -5 | 5 | -5
5 | 0 | five | 5 | -5 | 5 | -5
5 | 0 | five | 5 | -5 | 0 |
5 | 0 | five | 5 | -5 | |
5 | 0 | five | 5 | -5 | | 0
6 | 6 | six | 5 | -5 | 1 | -1
6 | 6 | six | 5 | -5 | 2 | 2
6 | 6 | six | 5 | -5 | 3 | -3
6 | 6 | six | 5 | -5 | 2 | 4
6 | 6 | six | 5 | -5 | 5 | -5
6 | 6 | six | 5 | -5 | 5 | -5
6 | 6 | six | 5 | -5 | 0 |
6 | 6 | six | 5 | -5 | |
6 | 6 | six | 5 | -5 | | 0
7 | 7 | seven | 5 | -5 | 1 | -1
7 | 7 | seven | 5 | -5 | 2 | 2
7 | 7 | seven | 5 | -5 | 3 | -3
7 | 7 | seven | 5 | -5 | 2 | 4
7 | 7 | seven | 5 | -5 | 5 | -5
7 | 7 | seven | 5 | -5 | 5 | -5
7 | 7 | seven | 5 | -5 | 0 |
7 | 7 | seven | 5 | -5 | |
7 | 7 | seven | 5 | -5 | | 0
8 | 8 | eight | 5 | -5 | 1 | -1
8 | 8 | eight | 5 | -5 | 2 | 2
8 | 8 | eight | 5 | -5 | 3 | -3
8 | 8 | eight | 5 | -5 | 2 | 4
8 | 8 | eight | 5 | -5 | 5 | -5
8 | 8 | eight | 5 | -5 | 5 | -5
8 | 8 | eight | 5 | -5 | 0 |
8 | 8 | eight | 5 | -5 | |
8 | 8 | eight | 5 | -5 | | 0
0 | | zero | 5 | -5 | 1 | -1
0 | | zero | 5 | -5 | 2 | 2
0 | | zero | 5 | -5 | 3 | -3
0 | | zero | 5 | -5 | 2 | 4
0 | | zero | 5 | -5 | 5 | -5
0 | | zero | 5 | -5 | 5 | -5
0 | | zero | 5 | -5 | 0 |
0 | | zero | 5 | -5 | |
0 | | zero | 5 | -5 | | 0
| | null | 5 | -5 | 1 | -1
| | null | 5 | -5 | 2 | 2
| | null | 5 | -5 | 3 | -3
| | null | 5 | -5 | 2 | 4
| | null | 5 | -5 | 5 | -5
| | null | 5 | -5 | 5 | -5
| | null | 5 | -5 | 0 |
| | null | 5 | -5 | |
| | null | 5 | -5 | | 0
| 0 | zero | 5 | -5 | 1 | -1
| 0 | zero | 5 | -5 | 2 | 2
| 0 | zero | 5 | -5 | 3 | -3
| 0 | zero | 5 | -5 | 2 | 4
| 0 | zero | 5 | -5 | 5 | -5
| 0 | zero | 5 | -5 | 5 | -5
| 0 | zero | 5 | -5 | 0 |
| 0 | zero | 5 | -5 | |
| 0 | zero | 5 | -5 | | 0
1 | 4 | one | 0 | | 1 | -1
1 | 4 | one | 0 | | 2 | 2
1 | 4 | one | 0 | | 3 | -3
1 | 4 | one | 0 | | 2 | 4
1 | 4 | one | 0 | | 5 | -5
1 | 4 | one | 0 | | 5 | -5
1 | 4 | one | 0 | | 0 |
1 | 4 | one | 0 | | |
1 | 4 | one | 0 | | | 0
2 | 3 | two | 0 | | 1 | -1
2 | 3 | two | 0 | | 2 | 2
2 | 3 | two | 0 | | 3 | -3
2 | 3 | two | 0 | | 2 | 4
2 | 3 | two | 0 | | 5 | -5
2 | 3 | two | 0 | | 5 | -5
2 | 3 | two | 0 | | 0 |
2 | 3 | two | 0 | | |
2 | 3 | two | 0 | | | 0
3 | 2 | three | 0 | | 1 | -1
3 | 2 | three | 0 | | 2 | 2
3 | 2 | three | 0 | | 3 | -3
3 | 2 | three | 0 | | 2 | 4
3 | 2 | three | 0 | | 5 | -5
3 | 2 | three | 0 | | 5 | -5
3 | 2 | three | 0 | | 0 |
3 | 2 | three | 0 | | |
3 | 2 | three | 0 | | | 0
4 | 1 | four | 0 | | 1 | -1
4 | 1 | four | 0 | | 2 | 2
4 | 1 | four | 0 | | 3 | -3
4 | 1 | four | 0 | | 2 | 4
4 | 1 | four | 0 | | 5 | -5
4 | 1 | four | 0 | | 5 | -5
4 | 1 | four | 0 | | 0 |
4 | 1 | four | 0 | | |
4 | 1 | four | 0 | | | 0
5 | 0 | five | 0 | | 1 | -1
5 | 0 | five | 0 | | 2 | 2
5 | 0 | five | 0 | | 3 | -3
5 | 0 | five | 0 | | 2 | 4
5 | 0 | five | 0 | | 5 | -5
5 | 0 | five | 0 | | 5 | -5
5 | 0 | five | 0 | | 0 |
5 | 0 | five | 0 | | |
5 | 0 | five | 0 | | | 0
6 | 6 | six | 0 | | 1 | -1
6 | 6 | six | 0 | | 2 | 2
6 | 6 | six | 0 | | 3 | -3
6 | 6 | six | 0 | | 2 | 4
6 | 6 | six | 0 | | 5 | -5
6 | 6 | six | 0 | | 5 | -5
6 | 6 | six | 0 | | 0 |
6 | 6 | six | 0 | | |
6 | 6 | six | 0 | | | 0
7 | 7 | seven | 0 | | 1 | -1
7 | 7 | seven | 0 | | 2 | 2
7 | 7 | seven | 0 | | 3 | -3
7 | 7 | seven | 0 | | 2 | 4
7 | 7 | seven | 0 | | 5 | -5
7 | 7 | seven | 0 | | 5 | -5
7 | 7 | seven | 0 | | 0 |
7 | 7 | seven | 0 | | |
7 | 7 | seven | 0 | | | 0
8 | 8 | eight | 0 | | 1 | -1
8 | 8 | eight | 0 | | 2 | 2
8 | 8 | eight | 0 | | 3 | -3
8 | 8 | eight | 0 | | 2 | 4
8 | 8 | eight | 0 | | 5 | -5
8 | 8 | eight | 0 | | 5 | -5
8 | 8 | eight | 0 | | 0 |
8 | 8 | eight | 0 | | |
8 | 8 | eight | 0 | | | 0
0 | | zero | 0 | | 1 | -1
0 | | zero | 0 | | 2 | 2
0 | | zero | 0 | | 3 | -3
0 | | zero | 0 | | 2 | 4
0 | | zero | 0 | | 5 | -5
0 | | zero | 0 | | 5 | -5
0 | | zero | 0 | | 0 |
0 | | zero | 0 | | |
0 | | zero | 0 | | | 0
| | null | 0 | | 1 | -1
| | null | 0 | | 2 | 2
| | null | 0 | | 3 | -3
| | null | 0 | | 2 | 4
| | null | 0 | | 5 | -5
| | null | 0 | | 5 | -5
| | null | 0 | | 0 |
| | null | 0 | | |
| | null | 0 | | | 0
| 0 | zero | 0 | | 1 | -1
| 0 | zero | 0 | | 2 | 2
| 0 | zero | 0 | | 3 | -3
| 0 | zero | 0 | | 2 | 4
| 0 | zero | 0 | | 5 | -5
| 0 | zero | 0 | | 5 | -5
| 0 | zero | 0 | | 0 |
| 0 | zero | 0 | | |
| 0 | zero | 0 | | | 0
1 | 4 | one | | | 1 | -1
1 | 4 | one | | | 2 | 2
1 | 4 | one | | | 3 | -3
1 | 4 | one | | | 2 | 4
1 | 4 | one | | | 5 | -5
1 | 4 | one | | | 5 | -5
1 | 4 | one | | | 0 |
1 | 4 | one | | | |
1 | 4 | one | | | | 0
2 | 3 | two | | | 1 | -1
2 | 3 | two | | | 2 | 2
2 | 3 | two | | | 3 | -3
2 | 3 | two | | | 2 | 4
2 | 3 | two | | | 5 | -5
2 | 3 | two | | | 5 | -5
2 | 3 | two | | | 0 |
2 | 3 | two | | | |
2 | 3 | two | | | | 0
3 | 2 | three | | | 1 | -1
3 | 2 | three | | | 2 | 2
3 | 2 | three | | | 3 | -3
3 | 2 | three | | | 2 | 4
3 | 2 | three | | | 5 | -5
3 | 2 | three | | | 5 | -5
3 | 2 | three | | | 0 |
3 | 2 | three | | | |
3 | 2 | three | | | | 0
4 | 1 | four | | | 1 | -1
4 | 1 | four | | | 2 | 2
4 | 1 | four | | | 3 | -3
4 | 1 | four | | | 2 | 4
4 | 1 | four | | | 5 | -5
4 | 1 | four | | | 5 | -5
4 | 1 | four | | | 0 |
4 | 1 | four | | | |
4 | 1 | four | | | | 0
5 | 0 | five | | | 1 | -1
5 | 0 | five | | | 2 | 2
5 | 0 | five | | | 3 | -3
5 | 0 | five | | | 2 | 4
5 | 0 | five | | | 5 | -5
5 | 0 | five | | | 5 | -5
5 | 0 | five | | | 0 |
5 | 0 | five | | | |
5 | 0 | five | | | | 0
6 | 6 | six | | | 1 | -1
6 | 6 | six | | | 2 | 2
6 | 6 | six | | | 3 | -3
6 | 6 | six | | | 2 | 4
6 | 6 | six | | | 5 | -5
6 | 6 | six | | | 5 | -5
6 | 6 | six | | | 0 |
6 | 6 | six | | | |
6 | 6 | six | | | | 0
7 | 7 | seven | | | 1 | -1
7 | 7 | seven | | | 2 | 2
7 | 7 | seven | | | 3 | -3
7 | 7 | seven | | | 2 | 4
7 | 7 | seven | | | 5 | -5
7 | 7 | seven | | | 5 | -5
7 | 7 | seven | | | 0 |
7 | 7 | seven | | | |
7 | 7 | seven | | | | 0
8 | 8 | eight | | | 1 | -1
8 | 8 | eight | | | 2 | 2
8 | 8 | eight | | | 3 | -3
8 | 8 | eight | | | 2 | 4
8 | 8 | eight | | | 5 | -5
8 | 8 | eight | | | 5 | -5
8 | 8 | eight | | | 0 |
8 | 8 | eight | | | |
8 | 8 | eight | | | | 0
0 | | zero | | | 1 | -1
0 | | zero | | | 2 | 2
0 | | zero | | | 3 | -3
0 | | zero | | | 2 | 4
0 | | zero | | | 5 | -5
0 | | zero | | | 5 | -5
0 | | zero | | | 0 |
0 | | zero | | | |
0 | | zero | | | | 0
| | null | | | 1 | -1
| | null | | | 2 | 2
| | null | | | 3 | -3
| | null | | | 2 | 4
| | null | | | 5 | -5
| | null | | | 5 | -5
| | null | | | 0 |
| | null | | | |
| | null | | | | 0
| 0 | zero | | | 1 | -1
| 0 | zero | | | 2 | 2
| 0 | zero | | | 3 | -3
| 0 | zero | | | 2 | 4
| 0 | zero | | | 5 | -5
| 0 | zero | | | 5 | -5
| 0 | zero | | | 0 |
| 0 | zero | | | |
| 0 | zero | | | | 0
1 | 4 | one | | 0 | 1 | -1
1 | 4 | one | | 0 | 2 | 2
1 | 4 | one | | 0 | 3 | -3
1 | 4 | one | | 0 | 2 | 4
1 | 4 | one | | 0 | 5 | -5
1 | 4 | one | | 0 | 5 | -5
1 | 4 | one | | 0 | 0 |
1 | 4 | one | | 0 | |
1 | 4 | one | | 0 | | 0
2 | 3 | two | | 0 | 1 | -1
2 | 3 | two | | 0 | 2 | 2
2 | 3 | two | | 0 | 3 | -3
2 | 3 | two | | 0 | 2 | 4
2 | 3 | two | | 0 | 5 | -5
2 | 3 | two | | 0 | 5 | -5
2 | 3 | two | | 0 | 0 |
2 | 3 | two | | 0 | |
2 | 3 | two | | 0 | | 0
3 | 2 | three | | 0 | 1 | -1
3 | 2 | three | | 0 | 2 | 2
3 | 2 | three | | 0 | 3 | -3
3 | 2 | three | | 0 | 2 | 4
3 | 2 | three | | 0 | 5 | -5
3 | 2 | three | | 0 | 5 | -5
3 | 2 | three | | 0 | 0 |
3 | 2 | three | | 0 | |
3 | 2 | three | | 0 | | 0
4 | 1 | four | | 0 | 1 | -1
4 | 1 | four | | 0 | 2 | 2
4 | 1 | four | | 0 | 3 | -3
4 | 1 | four | | 0 | 2 | 4
4 | 1 | four | | 0 | 5 | -5
4 | 1 | four | | 0 | 5 | -5
4 | 1 | four | | 0 | 0 |
4 | 1 | four | | 0 | |
4 | 1 | four | | 0 | | 0
5 | 0 | five | | 0 | 1 | -1
5 | 0 | five | | 0 | 2 | 2
5 | 0 | five | | 0 | 3 | -3
5 | 0 | five | | 0 | 2 | 4
5 | 0 | five | | 0 | 5 | -5
5 | 0 | five | | 0 | 5 | -5
5 | 0 | five | | 0 | 0 |
5 | 0 | five | | 0 | |
5 | 0 | five | | 0 | | 0
6 | 6 | six | | 0 | 1 | -1
6 | 6 | six | | 0 | 2 | 2
6 | 6 | six | | 0 | 3 | -3
6 | 6 | six | | 0 | 2 | 4
6 | 6 | six | | 0 | 5 | -5
6 | 6 | six | | 0 | 5 | -5
6 | 6 | six | | 0 | 0 |
6 | 6 | six | | 0 | |
6 | 6 | six | | 0 | | 0
7 | 7 | seven | | 0 | 1 | -1
7 | 7 | seven | | 0 | 2 | 2
7 | 7 | seven | | 0 | 3 | -3
7 | 7 | seven | | 0 | 2 | 4
7 | 7 | seven | | 0 | 5 | -5
7 | 7 | seven | | 0 | 5 | -5
7 | 7 | seven | | 0 | 0 |
7 | 7 | seven | | 0 | |
7 | 7 | seven | | 0 | | 0
8 | 8 | eight | | 0 | 1 | -1
8 | 8 | eight | | 0 | 2 | 2
8 | 8 | eight | | 0 | 3 | -3
8 | 8 | eight | | 0 | 2 | 4
8 | 8 | eight | | 0 | 5 | -5
8 | 8 | eight | | 0 | 5 | -5
8 | 8 | eight | | 0 | 0 |
8 | 8 | eight | | 0 | |
8 | 8 | eight | | 0 | | 0
0 | | zero | | 0 | 1 | -1
0 | | zero | | 0 | 2 | 2
0 | | zero | | 0 | 3 | -3
0 | | zero | | 0 | 2 | 4
0 | | zero | | 0 | 5 | -5
0 | | zero | | 0 | 5 | -5
0 | | zero | | 0 | 0 |
0 | | zero | | 0 | |
0 | | zero | | 0 | | 0
| | null | | 0 | 1 | -1
| | null | | 0 | 2 | 2
| | null | | 0 | 3 | -3
| | null | | 0 | 2 | 4
| | null | | 0 | 5 | -5
| | null | | 0 | 5 | -5
| | null | | 0 | 0 |
| | null | | 0 | |
| | null | | 0 | | 0
| 0 | zero | | 0 | 1 | -1
| 0 | zero | | 0 | 2 | 2
| 0 | zero | | 0 | 3 | -3
| 0 | zero | | 0 | 2 | 4
| 0 | zero | | 0 | 5 | -5
| 0 | zero | | 0 | 5 | -5
| 0 | zero | | 0 | 0 |
| 0 | zero | | 0 | |
| 0 | zero | | 0 | | 0
(891 rows)
--
--
-- Inner joins (equi-joins)
--
--
--
-- Inner joins (equi-joins) with USING clause
-- The USING syntax changes the shape of the resulting table
-- by including a column in the USING clause only once in the result.
--
-- Inner equi-join on specified column
SELECT *
FROM J1_TBL INNER JOIN J2_TBL USING (i);
i | j | t | k
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
5 | 0 | five | -5
5 | 0 | five | -5
(7 rows)
-- Same as above, slightly different syntax
SELECT *
FROM J1_TBL JOIN J2_TBL USING (i);
i | j | t | k
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
5 | 0 | five | -5
5 | 0 | five | -5
(7 rows)
SELECT *
FROM J1_TBL t1 (a, b, c) JOIN J2_TBL t2 (a, d) USING (a)
ORDER BY a, d;
a | b | c | d
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
5 | 0 | five | -5
5 | 0 | five | -5
(7 rows)
SELECT *
FROM J1_TBL t1 (a, b, c) JOIN J2_TBL t2 (a, b) USING (b)
ORDER BY b, t1.a;
b | a | c | a
---+---+-------+---
0 | 5 | five |
0 | | zero |
2 | 3 | three | 2
4 | 1 | one | 2
(4 rows)
-- test join using aliases
SELECT * FROM J1_TBL JOIN J2_TBL USING (i) WHERE J1_TBL.t = 'one'; -- ok
i | j | t | k
---+---+-----+----
1 | 4 | one | -1
(1 row)
SELECT * FROM J1_TBL JOIN J2_TBL USING (i) AS x WHERE J1_TBL.t = 'one'; -- ok
i | j | t | k
---+---+-----+----
1 | 4 | one | -1
(1 row)
SELECT * FROM (J1_TBL JOIN J2_TBL USING (i)) AS x WHERE J1_TBL.t = 'one'; -- error
ERROR: invalid reference to FROM-clause entry for table "j1_tbl"
LINE 1: ... * FROM (J1_TBL JOIN J2_TBL USING (i)) AS x WHERE J1_TBL.t =...
^
HINT: There is an entry for table "j1_tbl", but it cannot be referenced from this part of the query.
SELECT * FROM J1_TBL JOIN J2_TBL USING (i) AS x WHERE x.i = 1; -- ok
i | j | t | k
---+---+-----+----
1 | 4 | one | -1
(1 row)
SELECT * FROM J1_TBL JOIN J2_TBL USING (i) AS x WHERE x.t = 'one'; -- error
ERROR: column x.t does not exist
LINE 1: ...CT * FROM J1_TBL JOIN J2_TBL USING (i) AS x WHERE x.t = 'one...
^
SELECT * FROM (J1_TBL JOIN J2_TBL USING (i) AS x) AS xx WHERE x.i = 1; -- error (XXX could use better hint)
ERROR: missing FROM-clause entry for table "x"
LINE 1: ...ROM (J1_TBL JOIN J2_TBL USING (i) AS x) AS xx WHERE x.i = 1;
^
SELECT * FROM J1_TBL a1 JOIN J2_TBL a2 USING (i) AS a1; -- error
ERROR: table name "a1" specified more than once
SELECT x.* FROM J1_TBL JOIN J2_TBL USING (i) AS x WHERE J1_TBL.t = 'one';
i
---
1
(1 row)
SELECT ROW(x.*) FROM J1_TBL JOIN J2_TBL USING (i) AS x WHERE J1_TBL.t = 'one';
row
-----
(1)
(1 row)
SELECT row_to_json(x.*) FROM J1_TBL JOIN J2_TBL USING (i) AS x WHERE J1_TBL.t = 'one';
row_to_json
-------------
{"i":1}
(1 row)
--
-- NATURAL JOIN
-- Inner equi-join on all columns with the same name
--
SELECT *
FROM J1_TBL NATURAL JOIN J2_TBL;
i | j | t | k
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
5 | 0 | five | -5
5 | 0 | five | -5
(7 rows)
SELECT *
FROM J1_TBL t1 (a, b, c) NATURAL JOIN J2_TBL t2 (a, d);
a | b | c | d
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
5 | 0 | five | -5
5 | 0 | five | -5
(7 rows)
SELECT *
FROM J1_TBL t1 (a, b, c) NATURAL JOIN J2_TBL t2 (d, a);
a | b | c | d
---+---+------+---
0 | | zero |
2 | 3 | two | 2
4 | 1 | four | 2
(3 rows)
-- mismatch number of columns
-- currently, Postgres will fill in with underlying names
SELECT *
FROM J1_TBL t1 (a, b) NATURAL JOIN J2_TBL t2 (a);
a | b | t | k
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
5 | 0 | five | -5
5 | 0 | five | -5
(7 rows)
--
-- Inner joins (equi-joins)
--
SELECT *
FROM J1_TBL JOIN J2_TBL ON (J1_TBL.i = J2_TBL.i);
i | j | t | i | k
---+---+-------+---+----
0 | | zero | 0 |
1 | 4 | one | 1 | -1
2 | 3 | two | 2 | 2
2 | 3 | two | 2 | 4
3 | 2 | three | 3 | -3
5 | 0 | five | 5 | -5
5 | 0 | five | 5 | -5
(7 rows)
SELECT *
FROM J1_TBL JOIN J2_TBL ON (J1_TBL.i = J2_TBL.k);
i | j | t | i | k
---+---+------+---+---
0 | | zero | | 0
2 | 3 | two | 2 | 2
4 | 1 | four | 2 | 4
(3 rows)
--
-- Non-equi-joins
--
SELECT *
FROM J1_TBL JOIN J2_TBL ON (J1_TBL.i <= J2_TBL.k);
i | j | t | i | k
---+---+-------+---+---
1 | 4 | one | 2 | 2
2 | 3 | two | 2 | 2
0 | | zero | 2 | 2
1 | 4 | one | 2 | 4
2 | 3 | two | 2 | 4
3 | 2 | three | 2 | 4
4 | 1 | four | 2 | 4
0 | | zero | 2 | 4
0 | | zero | | 0
(9 rows)
--
-- Outer joins
-- Note that OUTER is a noise word
--
SELECT *
FROM J1_TBL LEFT OUTER JOIN J2_TBL USING (i)
ORDER BY i, k, t;
i | j | t | k
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
4 | 1 | four |
5 | 0 | five | -5
5 | 0 | five | -5
6 | 6 | six |
7 | 7 | seven |
8 | 8 | eight |
| | null |
| 0 | zero |
(13 rows)
SELECT *
FROM J1_TBL LEFT JOIN J2_TBL USING (i)
ORDER BY i, k, t;
i | j | t | k
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
4 | 1 | four |
5 | 0 | five | -5
5 | 0 | five | -5
6 | 6 | six |
7 | 7 | seven |
8 | 8 | eight |
| | null |
| 0 | zero |
(13 rows)
SELECT *
FROM J1_TBL RIGHT OUTER JOIN J2_TBL USING (i);
i | j | t | k
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
5 | 0 | five | -5
5 | 0 | five | -5
| | |
| | | 0
(9 rows)
SELECT *
FROM J1_TBL RIGHT JOIN J2_TBL USING (i);
i | j | t | k
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
5 | 0 | five | -5
5 | 0 | five | -5
| | |
| | | 0
(9 rows)
SELECT *
FROM J1_TBL FULL OUTER JOIN J2_TBL USING (i)
ORDER BY i, k, t;
i | j | t | k
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
4 | 1 | four |
5 | 0 | five | -5
5 | 0 | five | -5
6 | 6 | six |
7 | 7 | seven |
8 | 8 | eight |
| | | 0
| | null |
| 0 | zero |
| | |
(15 rows)
SELECT *
FROM J1_TBL FULL JOIN J2_TBL USING (i)
ORDER BY i, k, t;
i | j | t | k
---+---+-------+----
0 | | zero |
1 | 4 | one | -1
2 | 3 | two | 2
2 | 3 | two | 4
3 | 2 | three | -3
4 | 1 | four |
5 | 0 | five | -5
5 | 0 | five | -5
6 | 6 | six |
7 | 7 | seven |
8 | 8 | eight |
| | | 0
| | null |
| 0 | zero |
| | |
(15 rows)
SELECT *
FROM J1_TBL LEFT JOIN J2_TBL USING (i) WHERE (k = 1);
i | j | t | k
---+---+---+---
(0 rows)
SELECT *
FROM J1_TBL LEFT JOIN J2_TBL USING (i) WHERE (i = 1);
i | j | t | k
---+---+-----+----
1 | 4 | one | -1
(1 row)
--
-- semijoin selectivity for <>
--
explain (costs off)
select * from int4_tbl i4, tenk1 a
where exists(select * from tenk1 b
where a.twothousand = b.twothousand and a.fivethous <> b.fivethous)
and i4.f1 = a.tenthous;
QUERY PLAN
----------------------------------------------
Hash Semi Join
Hash Cond: (a.twothousand = b.twothousand)
Join Filter: (a.fivethous <> b.fivethous)
-> Hash Join
Hash Cond: (a.tenthous = i4.f1)
-> Seq Scan on tenk1 a
-> Hash
-> Seq Scan on int4_tbl i4
-> Hash
-> Seq Scan on tenk1 b
(10 rows)
--
-- More complicated constructs
--
--
-- Multiway full join
--
CREATE TABLE t1 (name TEXT, n INTEGER);
CREATE TABLE t2 (name TEXT, n INTEGER);
CREATE TABLE t3 (name TEXT, n INTEGER);
INSERT INTO t1 VALUES ( 'bb', 11 );
INSERT INTO t2 VALUES ( 'bb', 12 );
INSERT INTO t2 VALUES ( 'cc', 22 );
INSERT INTO t2 VALUES ( 'ee', 42 );
INSERT INTO t3 VALUES ( 'bb', 13 );
INSERT INTO t3 VALUES ( 'cc', 23 );
INSERT INTO t3 VALUES ( 'dd', 33 );
SELECT * FROM t1 FULL JOIN t2 USING (name) FULL JOIN t3 USING (name);
name | n | n | n
------+----+----+----
bb | 11 | 12 | 13
cc | | 22 | 23
dd | | | 33
ee | | 42 |
(4 rows)
--
-- Test interactions of join syntax and subqueries
--
-- Basic cases (we expect planner to pull up the subquery here)
SELECT * FROM
(SELECT * FROM t2) as s2
INNER JOIN
(SELECT * FROM t3) s3
USING (name);
name | n | n
------+----+----
bb | 12 | 13
cc | 22 | 23
(2 rows)
SELECT * FROM
(SELECT * FROM t2) as s2
LEFT JOIN
(SELECT * FROM t3) s3
USING (name);
name | n | n
------+----+----
bb | 12 | 13
cc | 22 | 23
ee | 42 |
(3 rows)
SELECT * FROM
(SELECT * FROM t2) as s2
FULL JOIN
(SELECT * FROM t3) s3
USING (name);
name | n | n
------+----+----
bb | 12 | 13
cc | 22 | 23
dd | | 33
ee | 42 |
(4 rows)
-- Cases with non-nullable expressions in subquery results;
-- make sure these go to null as expected
SELECT * FROM
(SELECT name, n as s2_n, 2 as s2_2 FROM t2) as s2
NATURAL INNER JOIN
(SELECT name, n as s3_n, 3 as s3_2 FROM t3) s3;
name | s2_n | s2_2 | s3_n | s3_2
------+------+------+------+------
bb | 12 | 2 | 13 | 3
cc | 22 | 2 | 23 | 3
(2 rows)
SELECT * FROM
(SELECT name, n as s2_n, 2 as s2_2 FROM t2) as s2
NATURAL LEFT JOIN
(SELECT name, n as s3_n, 3 as s3_2 FROM t3) s3;
name | s2_n | s2_2 | s3_n | s3_2
------+------+------+------+------
bb | 12 | 2 | 13 | 3
cc | 22 | 2 | 23 | 3
ee | 42 | 2 | |
(3 rows)
SELECT * FROM
(SELECT name, n as s2_n, 2 as s2_2 FROM t2) as s2
NATURAL FULL JOIN
(SELECT name, n as s3_n, 3 as s3_2 FROM t3) s3;
name | s2_n | s2_2 | s3_n | s3_2
------+------+------+------+------
bb | 12 | 2 | 13 | 3
cc | 22 | 2 | 23 | 3
dd | | | 33 | 3
ee | 42 | 2 | |
(4 rows)
SELECT * FROM
(SELECT name, n as s1_n, 1 as s1_1 FROM t1) as s1
NATURAL INNER JOIN
(SELECT name, n as s2_n, 2 as s2_2 FROM t2) as s2
NATURAL INNER JOIN
(SELECT name, n as s3_n, 3 as s3_2 FROM t3) s3;
name | s1_n | s1_1 | s2_n | s2_2 | s3_n | s3_2
------+------+------+------+------+------+------
bb | 11 | 1 | 12 | 2 | 13 | 3
(1 row)
SELECT * FROM
(SELECT name, n as s1_n, 1 as s1_1 FROM t1) as s1
NATURAL FULL JOIN
(SELECT name, n as s2_n, 2 as s2_2 FROM t2) as s2
NATURAL FULL JOIN
(SELECT name, n as s3_n, 3 as s3_2 FROM t3) s3;
name | s1_n | s1_1 | s2_n | s2_2 | s3_n | s3_2
------+------+------+------+------+------+------
bb | 11 | 1 | 12 | 2 | 13 | 3
cc | | | 22 | 2 | 23 | 3
dd | | | | | 33 | 3
ee | | | 42 | 2 | |
(4 rows)
SELECT * FROM
(SELECT name, n as s1_n FROM t1) as s1
NATURAL FULL JOIN
(SELECT * FROM
(SELECT name, n as s2_n FROM t2) as s2
NATURAL FULL JOIN
(SELECT name, n as s3_n FROM t3) as s3
) ss2;
name | s1_n | s2_n | s3_n
------+------+------+------
bb | 11 | 12 | 13
cc | | 22 | 23
dd | | | 33
ee | | 42 |
(4 rows)
SELECT * FROM
(SELECT name, n as s1_n FROM t1) as s1
NATURAL FULL JOIN
(SELECT * FROM
(SELECT name, n as s2_n, 2 as s2_2 FROM t2) as s2
NATURAL FULL JOIN
(SELECT name, n as s3_n FROM t3) as s3
) ss2;
name | s1_n | s2_n | s2_2 | s3_n
------+------+------+------+------
bb | 11 | 12 | 2 | 13
cc | | 22 | 2 | 23
dd | | | | 33
ee | | 42 | 2 |
(4 rows)
-- Constants as join keys can also be problematic
SELECT * FROM
(SELECT name, n as s1_n FROM t1) as s1
FULL JOIN
(SELECT name, 2 as s2_n FROM t2) as s2
ON (s1_n = s2_n);
name | s1_n | name | s2_n
------+------+------+------
| | bb | 2
| | cc | 2
| | ee | 2
bb | 11 | |
(4 rows)
-- Test for propagation of nullability constraints into sub-joins
create temp table x (x1 int, x2 int);
insert into x values (1,11);
insert into x values (2,22);
insert into x values (3,null);
insert into x values (4,44);
insert into x values (5,null);
create temp table y (y1 int, y2 int);
insert into y values (1,111);
insert into y values (2,222);
insert into y values (3,333);
insert into y values (4,null);
select * from x;
x1 | x2
----+----
1 | 11
2 | 22
3 |
4 | 44
5 |
(5 rows)
select * from y;
y1 | y2
----+-----
1 | 111
2 | 222
3 | 333
4 |
(4 rows)
select * from x left join y on (x1 = y1 and x2 is not null);
x1 | x2 | y1 | y2
----+----+----+-----
1 | 11 | 1 | 111
2 | 22 | 2 | 222
3 | | |
4 | 44 | 4 |
5 | | |
(5 rows)
select * from x left join y on (x1 = y1 and y2 is not null);
x1 | x2 | y1 | y2
----+----+----+-----
1 | 11 | 1 | 111
2 | 22 | 2 | 222
3 | | 3 | 333
4 | 44 | |
5 | | |
(5 rows)
select * from (x left join y on (x1 = y1)) left join x xx(xx1,xx2)
on (x1 = xx1);
x1 | x2 | y1 | y2 | xx1 | xx2
----+----+----+-----+-----+-----
1 | 11 | 1 | 111 | 1 | 11
2 | 22 | 2 | 222 | 2 | 22
3 | | 3 | 333 | 3 |
4 | 44 | 4 | | 4 | 44
5 | | | | 5 |
(5 rows)
select * from (x left join y on (x1 = y1)) left join x xx(xx1,xx2)
on (x1 = xx1 and x2 is not null);
x1 | x2 | y1 | y2 | xx1 | xx2
----+----+----+-----+-----+-----
1 | 11 | 1 | 111 | 1 | 11
2 | 22 | 2 | 222 | 2 | 22
3 | | 3 | 333 | |
4 | 44 | 4 | | 4 | 44
5 | | | | |
(5 rows)
select * from (x left join y on (x1 = y1)) left join x xx(xx1,xx2)
on (x1 = xx1 and y2 is not null);
x1 | x2 | y1 | y2 | xx1 | xx2
----+----+----+-----+-----+-----
1 | 11 | 1 | 111 | 1 | 11
2 | 22 | 2 | 222 | 2 | 22
3 | | 3 | 333 | 3 |
4 | 44 | 4 | | |
5 | | | | |
(5 rows)
select * from (x left join y on (x1 = y1)) left join x xx(xx1,xx2)
on (x1 = xx1 and xx2 is not null);
x1 | x2 | y1 | y2 | xx1 | xx2
----+----+----+-----+-----+-----
1 | 11 | 1 | 111 | 1 | 11
2 | 22 | 2 | 222 | 2 | 22
3 | | 3 | 333 | |
4 | 44 | 4 | | 4 | 44
5 | | | | |
(5 rows)
-- these should NOT give the same answers as above
select * from (x left join y on (x1 = y1)) left join x xx(xx1,xx2)
on (x1 = xx1) where (x2 is not null);
x1 | x2 | y1 | y2 | xx1 | xx2
----+----+----+-----+-----+-----
1 | 11 | 1 | 111 | 1 | 11
2 | 22 | 2 | 222 | 2 | 22
4 | 44 | 4 | | 4 | 44
(3 rows)
select * from (x left join y on (x1 = y1)) left join x xx(xx1,xx2)
on (x1 = xx1) where (y2 is not null);
x1 | x2 | y1 | y2 | xx1 | xx2
----+----+----+-----+-----+-----
1 | 11 | 1 | 111 | 1 | 11
2 | 22 | 2 | 222 | 2 | 22
3 | | 3 | 333 | 3 |
(3 rows)
select * from (x left join y on (x1 = y1)) left join x xx(xx1,xx2)
on (x1 = xx1) where (xx2 is not null);
x1 | x2 | y1 | y2 | xx1 | xx2
----+----+----+-----+-----+-----
1 | 11 | 1 | 111 | 1 | 11
2 | 22 | 2 | 222 | 2 | 22
4 | 44 | 4 | | 4 | 44
(3 rows)
--
-- regression test: check for bug with propagation of implied equality
-- to outside an IN
--
select count(*) from tenk1 a where unique1 in
(select unique1 from tenk1 b join tenk1 c using (unique1)
where b.unique2 = 42);
count
-------
1
(1 row)
--
-- regression test: check for failure to generate a plan with multiple
-- degenerate IN clauses
--
select count(*) from tenk1 x where
x.unique1 in (select a.f1 from int4_tbl a,float8_tbl b where a.f1=b.f1) and
x.unique1 = 0 and
x.unique1 in (select aa.f1 from int4_tbl aa,float8_tbl bb where aa.f1=bb.f1);
count
-------
1
(1 row)
-- try that with GEQO too
begin;
set geqo = on;
set geqo_threshold = 2;
select count(*) from tenk1 x where
x.unique1 in (select a.f1 from int4_tbl a,float8_tbl b where a.f1=b.f1) and
x.unique1 = 0 and
x.unique1 in (select aa.f1 from int4_tbl aa,float8_tbl bb where aa.f1=bb.f1);
count
-------
1
(1 row)
rollback;
--
-- regression test: be sure we cope with proven-dummy append rels
--
explain (costs off)
select aa, bb, unique1, unique1
from tenk1 right join b on aa = unique1
where bb < bb and bb is null;
QUERY PLAN
--------------------------
Result
One-Time Filter: false
(2 rows)
select aa, bb, unique1, unique1
from tenk1 right join b on aa = unique1
where bb < bb and bb is null;
aa | bb | unique1 | unique1
----+----+---------+---------
(0 rows)
--
-- regression test: check handling of empty-FROM subquery underneath outer join
--
explain (costs off)
select * from int8_tbl i1 left join (int8_tbl i2 join
(select 123 as x) ss on i2.q1 = x) on i1.q2 = i2.q2
order by 1, 2;
QUERY PLAN
-------------------------------------------
Sort
Sort Key: i1.q1, i1.q2
-> Hash Left Join
Hash Cond: (i1.q2 = i2.q2)
-> Seq Scan on int8_tbl i1
-> Hash
-> Seq Scan on int8_tbl i2
Filter: (q1 = 123)
(8 rows)
select * from int8_tbl i1 left join (int8_tbl i2 join
(select 123 as x) ss on i2.q1 = x) on i1.q2 = i2.q2
order by 1, 2;
q1 | q2 | q1 | q2 | x
------------------+-------------------+-----+------------------+-----
123 | 456 | 123 | 456 | 123
123 | 4567890123456789 | 123 | 4567890123456789 | 123
4567890123456789 | -4567890123456789 | | |
4567890123456789 | 123 | | |
4567890123456789 | 4567890123456789 | 123 | 4567890123456789 | 123
(5 rows)
--
-- regression test: check a case where join_clause_is_movable_into() gives
-- an imprecise result, causing an assertion failure
--
select count(*)
from
(select t3.tenthous as x1, coalesce(t1.stringu1, t2.stringu1) as x2
from tenk1 t1
left join tenk1 t2 on t1.unique1 = t2.unique1
join tenk1 t3 on t1.unique2 = t3.unique2) ss,
tenk1 t4,
tenk1 t5
where t4.thousand = t5.unique1 and ss.x1 = t4.tenthous and ss.x2 = t5.stringu1;
count
-------
1000
(1 row)
--
-- regression test: check a case where we formerly missed including an EC
-- enforcement clause because it was expected to be handled at scan level
--
explain (costs off)
select a.f1, b.f1, t.thousand, t.tenthous from
tenk1 t,
(select sum(f1)+1 as f1 from int4_tbl i4a) a,
(select sum(f1) as f1 from int4_tbl i4b) b
where b.f1 = t.thousand and a.f1 = b.f1 and (a.f1+b.f1+999) = t.tenthous;
QUERY PLAN
-----------------------------------------------------------------------------------------------------------------------
Nested Loop
-> Aggregate
-> Seq Scan on int4_tbl i4b
-> Nested Loop
Join Filter: ((sum(i4b.f1)) = ((sum(i4a.f1) + 1)))
-> Aggregate
-> Seq Scan on int4_tbl i4a
-> Index Only Scan using tenk1_thous_tenthous on tenk1 t
Index Cond: ((thousand = (sum(i4b.f1))) AND (tenthous = ((((sum(i4a.f1) + 1)) + (sum(i4b.f1))) + 999)))
(9 rows)
select a.f1, b.f1, t.thousand, t.tenthous from
tenk1 t,
(select sum(f1)+1 as f1 from int4_tbl i4a) a,
(select sum(f1) as f1 from int4_tbl i4b) b
where b.f1 = t.thousand and a.f1 = b.f1 and (a.f1+b.f1+999) = t.tenthous;
f1 | f1 | thousand | tenthous
----+----+----------+----------
(0 rows)
--
-- check a case where we formerly got confused by conflicting sort orders
-- in redundant merge join path keys
--
explain (costs off)
select * from
j1_tbl full join
(select * from j2_tbl order by j2_tbl.i desc, j2_tbl.k asc) j2_tbl
on j1_tbl.i = j2_tbl.i and j1_tbl.i = j2_tbl.k;
QUERY PLAN
-----------------------------------------------------------------
Merge Full Join
Merge Cond: ((j2_tbl.i = j1_tbl.i) AND (j2_tbl.k = j1_tbl.i))
-> Sort
Sort Key: j2_tbl.i DESC, j2_tbl.k
-> Seq Scan on j2_tbl
-> Sort
Sort Key: j1_tbl.i DESC
-> Seq Scan on j1_tbl
(8 rows)
select * from
j1_tbl full join
(select * from j2_tbl order by j2_tbl.i desc, j2_tbl.k asc) j2_tbl
on j1_tbl.i = j2_tbl.i and j1_tbl.i = j2_tbl.k;
i | j | t | i | k
---+---+-------+---+----
| | | | 0
| | | |
| 0 | zero | |
| | null | |
8 | 8 | eight | |
7 | 7 | seven | |
6 | 6 | six | |
| | | 5 | -5
| | | 5 | -5
5 | 0 | five | |
4 | 1 | four | |
| | | 3 | -3
3 | 2 | three | |
2 | 3 | two | 2 | 2
| | | 2 | 4
| | | 1 | -1
| | | 0 |
1 | 4 | one | |
0 | | zero | |
(19 rows)
--
-- a different check for handling of redundant sort keys in merge joins
--
explain (costs off)
select count(*) from
(select * from tenk1 x order by x.thousand, x.twothousand, x.fivethous) x
left join
(select * from tenk1 y order by y.unique2) y
on x.thousand = y.unique2 and x.twothousand = y.hundred and x.fivethous = y.unique2;
QUERY PLAN
----------------------------------------------------------------------------------
Aggregate
-> Merge Left Join
Merge Cond: (x.thousand = y.unique2)
Join Filter: ((x.twothousand = y.hundred) AND (x.fivethous = y.unique2))
-> Sort
Sort Key: x.thousand, x.twothousand, x.fivethous
-> Seq Scan on tenk1 x
-> Materialize
-> Index Scan using tenk1_unique2 on tenk1 y
(9 rows)
select count(*) from
(select * from tenk1 x order by x.thousand, x.twothousand, x.fivethous) x
left join
(select * from tenk1 y order by y.unique2) y
on x.thousand = y.unique2 and x.twothousand = y.hundred and x.fivethous = y.unique2;
count
-------
10000
(1 row)
--
-- Clean up
--
DROP TABLE t1;
DROP TABLE t2;
DROP TABLE t3;
DROP TABLE J1_TBL;
DROP TABLE J2_TBL;
-- Both DELETE and UPDATE allow the specification of additional tables
-- to "join" against to determine which rows should be modified.
CREATE TEMP TABLE t1 (a int, b int);
CREATE TEMP TABLE t2 (a int, b int);
CREATE TEMP TABLE t3 (x int, y int);
INSERT INTO t1 VALUES (5, 10);
INSERT INTO t1 VALUES (15, 20);
INSERT INTO t1 VALUES (100, 100);
INSERT INTO t1 VALUES (200, 1000);
INSERT INTO t2 VALUES (200, 2000);
INSERT INTO t3 VALUES (5, 20);
INSERT INTO t3 VALUES (6, 7);
INSERT INTO t3 VALUES (7, 8);
INSERT INTO t3 VALUES (500, 100);
DELETE FROM t3 USING t1 table1 WHERE t3.x = table1.a;
SELECT * FROM t3;
x | y
-----+-----
6 | 7
7 | 8
500 | 100
(3 rows)
DELETE FROM t3 USING t1 JOIN t2 USING (a) WHERE t3.x > t1.a;
SELECT * FROM t3;
x | y
---+---
6 | 7
7 | 8
(2 rows)
DELETE FROM t3 USING t3 t3_other WHERE t3.x = t3_other.x AND t3.y = t3_other.y;
SELECT * FROM t3;
x | y
---+---
(0 rows)
-- Test join against inheritance tree
create temp table t2a () inherits (t2);
insert into t2a values (200, 2001);
select * from t1 left join t2 on (t1.a = t2.a);
a | b | a | b
-----+------+-----+------
5 | 10 | |
15 | 20 | |
100 | 100 | |
200 | 1000 | 200 | 2000
200 | 1000 | 200 | 2001
(5 rows)
-- Test matching of column name with wrong alias
select t1.x from t1 join t3 on (t1.a = t3.x);
ERROR: column t1.x does not exist
LINE 1: select t1.x from t1 join t3 on (t1.a = t3.x);
^
HINT: Perhaps you meant to reference the column "t3.x".
--
-- regression test for 8.1 merge right join bug
--
CREATE TEMP TABLE tt1 ( tt1_id int4, joincol int4 );
INSERT INTO tt1 VALUES (1, 11);
INSERT INTO tt1 VALUES (2, NULL);
CREATE TEMP TABLE tt2 ( tt2_id int4, joincol int4 );
INSERT INTO tt2 VALUES (21, 11);
INSERT INTO tt2 VALUES (22, 11);
set enable_hashjoin to off;
set enable_nestloop to off;
-- these should give the same results
select tt1.*, tt2.* from tt1 left join tt2 on tt1.joincol = tt2.joincol;
tt1_id | joincol | tt2_id | joincol
--------+---------+--------+---------
1 | 11 | 21 | 11
1 | 11 | 22 | 11
2 | | |
(3 rows)
select tt1.*, tt2.* from tt2 right join tt1 on tt1.joincol = tt2.joincol;
tt1_id | joincol | tt2_id | joincol
--------+---------+--------+---------
1 | 11 | 21 | 11
1 | 11 | 22 | 11
2 | | |
(3 rows)
reset enable_hashjoin;
reset enable_nestloop;
--
-- regression test for bug #13908 (hash join with skew tuples & nbatch increase)
--
set work_mem to '64kB';
set enable_mergejoin to off;
set enable_memoize to off;
explain (costs off)
select count(*) from tenk1 a, tenk1 b
where a.hundred = b.thousand and (b.fivethous % 10) < 10;
QUERY PLAN
------------------------------------------------------------
Aggregate
-> Hash Join
Hash Cond: (a.hundred = b.thousand)
-> Index Only Scan using tenk1_hundred on tenk1 a
-> Hash
-> Seq Scan on tenk1 b
Filter: ((fivethous % 10) < 10)
(7 rows)
select count(*) from tenk1 a, tenk1 b
where a.hundred = b.thousand and (b.fivethous % 10) < 10;
count
--------
100000
(1 row)
reset work_mem;
reset enable_mergejoin;
reset enable_memoize;
--
-- regression test for 8.2 bug with improper re-ordering of left joins
--
create temp table tt3(f1 int, f2 text);
insert into tt3 select x, repeat('xyzzy', 100) from generate_series(1,10000) x;
create index tt3i on tt3(f1);
analyze tt3;
create temp table tt4(f1 int);
insert into tt4 values (0),(1),(9999);
analyze tt4;
SELECT a.f1
FROM tt4 a
LEFT JOIN (
SELECT b.f1
FROM tt3 b LEFT JOIN tt3 c ON (b.f1 = c.f1)
WHERE c.f1 IS NULL
) AS d ON (a.f1 = d.f1)
WHERE d.f1 IS NULL;
f1
------
0
1
9999
(3 rows)
--
-- regression test for proper handling of outer joins within antijoins
--
create temp table tt4x(c1 int, c2 int, c3 int);
explain (costs off)
select * from tt4x t1
where not exists (
select 1 from tt4x t2
left join tt4x t3 on t2.c3 = t3.c1
left join ( select t5.c1 as c1
from tt4x t4 left join tt4x t5 on t4.c2 = t5.c1
) a1 on t3.c2 = a1.c1
where t1.c1 = t2.c2
);
QUERY PLAN
---------------------------------------------------------
Hash Anti Join
Hash Cond: (t1.c1 = t2.c2)
-> Seq Scan on tt4x t1
-> Hash
-> Merge Right Join
Merge Cond: (t5.c1 = t3.c2)
-> Merge Join
Merge Cond: (t4.c2 = t5.c1)
-> Sort
Sort Key: t4.c2
-> Seq Scan on tt4x t4
-> Sort
Sort Key: t5.c1
-> Seq Scan on tt4x t5
-> Sort
Sort Key: t3.c2
-> Merge Left Join
Merge Cond: (t2.c3 = t3.c1)
-> Sort
Sort Key: t2.c3
-> Seq Scan on tt4x t2
-> Sort
Sort Key: t3.c1
-> Seq Scan on tt4x t3
(24 rows)
--
-- regression test for problems of the sort depicted in bug #3494
--
create temp table tt5(f1 int, f2 int);
create temp table tt6(f1 int, f2 int);
insert into tt5 values(1, 10);
insert into tt5 values(1, 11);
insert into tt6 values(1, 9);
insert into tt6 values(1, 2);
insert into tt6 values(2, 9);
select * from tt5,tt6 where tt5.f1 = tt6.f1 and tt5.f1 = tt5.f2 - tt6.f2;
f1 | f2 | f1 | f2
----+----+----+----
1 | 10 | 1 | 9
(1 row)
--
-- regression test for problems of the sort depicted in bug #3588
--
create temp table xx (pkxx int);
create temp table yy (pkyy int, pkxx int);
insert into xx values (1);
insert into xx values (2);
insert into xx values (3);
insert into yy values (101, 1);
insert into yy values (201, 2);
insert into yy values (301, NULL);
select yy.pkyy as yy_pkyy, yy.pkxx as yy_pkxx, yya.pkyy as yya_pkyy,
xxa.pkxx as xxa_pkxx, xxb.pkxx as xxb_pkxx
from yy
left join (SELECT * FROM yy where pkyy = 101) as yya ON yy.pkyy = yya.pkyy
left join xx xxa on yya.pkxx = xxa.pkxx
left join xx xxb on coalesce (xxa.pkxx, 1) = xxb.pkxx;
yy_pkyy | yy_pkxx | yya_pkyy | xxa_pkxx | xxb_pkxx
---------+---------+----------+----------+----------
101 | 1 | 101 | 1 | 1
201 | 2 | | | 1
301 | | | | 1
(3 rows)
--
-- regression test for improper pushing of constants across outer-join clauses
-- (as seen in early 8.2.x releases)
--
create temp table zt1 (f1 int primary key);
create temp table zt2 (f2 int primary key);
create temp table zt3 (f3 int primary key);
insert into zt1 values(53);
insert into zt2 values(53);
select * from
zt2 left join zt3 on (f2 = f3)
left join zt1 on (f3 = f1)
where f2 = 53;
f2 | f3 | f1
----+----+----
53 | |
(1 row)
create temp view zv1 as select *,'dummy'::text AS junk from zt1;
select * from
zt2 left join zt3 on (f2 = f3)
left join zv1 on (f3 = f1)
where f2 = 53;
f2 | f3 | f1 | junk
----+----+----+------
53 | | |
(1 row)
--
-- regression test for improper extraction of OR indexqual conditions
-- (as seen in early 8.3.x releases)
--
select a.unique2, a.ten, b.tenthous, b.unique2, b.hundred
from tenk1 a left join tenk1 b on a.unique2 = b.tenthous
where a.unique1 = 42 and
((b.unique2 is null and a.ten = 2) or b.hundred = 3);
unique2 | ten | tenthous | unique2 | hundred
---------+-----+----------+---------+---------
(0 rows)
--
-- test proper positioning of one-time quals in EXISTS (8.4devel bug)
--
prepare foo(bool) as
select count(*) from tenk1 a left join tenk1 b
on (a.unique2 = b.unique1 and exists
(select 1 from tenk1 c where c.thousand = b.unique2 and $1));
execute foo(true);
count
-------
10000
(1 row)
execute foo(false);
count
-------
10000
(1 row)
--
-- test for sane behavior with noncanonical merge clauses, per bug #4926
--
begin;
set enable_mergejoin = 1;
set enable_hashjoin = 0;
set enable_nestloop = 0;
create temp table a (i integer);
create temp table b (x integer, y integer);
select * from a left join b on i = x and i = y and x = i;
i | x | y
---+---+---
(0 rows)
rollback;
--
-- test handling of merge clauses using record_ops
--
begin;
create type mycomptype as (id int, v bigint);
create temp table tidv (idv mycomptype);
create index on tidv (idv);
explain (costs off)
select a.idv, b.idv from tidv a, tidv b where a.idv = b.idv;
QUERY PLAN
----------------------------------------------------------
Merge Join
Merge Cond: (a.idv = b.idv)
-> Index Only Scan using tidv_idv_idx on tidv a
-> Materialize
-> Index Only Scan using tidv_idv_idx on tidv b
(5 rows)
set enable_mergejoin = 0;
set enable_hashjoin = 0;
explain (costs off)
select a.idv, b.idv from tidv a, tidv b where a.idv = b.idv;
QUERY PLAN
----------------------------------------------------
Nested Loop
-> Seq Scan on tidv a
-> Index Only Scan using tidv_idv_idx on tidv b
Index Cond: (idv = a.idv)
(4 rows)
rollback;
--
-- test NULL behavior of whole-row Vars, per bug #5025
--
select t1.q2, count(t2.*)
from int8_tbl t1 left join int8_tbl t2 on (t1.q2 = t2.q1)
group by t1.q2 order by 1;
q2 | count
-------------------+-------
-4567890123456789 | 0
123 | 2
456 | 0
4567890123456789 | 6
(4 rows)
select t1.q2, count(t2.*)
from int8_tbl t1 left join (select * from int8_tbl) t2 on (t1.q2 = t2.q1)
group by t1.q2 order by 1;
q2 | count
-------------------+-------
-4567890123456789 | 0
123 | 2
456 | 0
4567890123456789 | 6
(4 rows)
select t1.q2, count(t2.*)
from int8_tbl t1 left join (select * from int8_tbl offset 0) t2 on (t1.q2 = t2.q1)
group by t1.q2 order by 1;
q2 | count
-------------------+-------
-4567890123456789 | 0
123 | 2
456 | 0
4567890123456789 | 6
(4 rows)
select t1.q2, count(t2.*)
from int8_tbl t1 left join
(select q1, case when q2=1 then 1 else q2 end as q2 from int8_tbl) t2
on (t1.q2 = t2.q1)
group by t1.q2 order by 1;
q2 | count
-------------------+-------
-4567890123456789 | 0
123 | 2
456 | 0
4567890123456789 | 6
(4 rows)
--
-- test incorrect failure to NULL pulled-up subexpressions
--
begin;
create temp table a (
code char not null,
constraint a_pk primary key (code)
);
create temp table b (
a char not null,
num integer not null,
constraint b_pk primary key (a, num)
);
create temp table c (
name char not null,
a char,
constraint c_pk primary key (name)
);
insert into a (code) values ('p');
insert into a (code) values ('q');
insert into b (a, num) values ('p', 1);
insert into b (a, num) values ('p', 2);
insert into c (name, a) values ('A', 'p');
insert into c (name, a) values ('B', 'q');
insert into c (name, a) values ('C', null);
select c.name, ss.code, ss.b_cnt, ss.const
from c left join
(select a.code, coalesce(b_grp.cnt, 0) as b_cnt, -1 as const
from a left join
(select count(1) as cnt, b.a from b group by b.a) as b_grp
on a.code = b_grp.a
) as ss
on (c.a = ss.code)
order by c.name;
name | code | b_cnt | const
------+------+-------+-------
A | p | 2 | -1
B | q | 0 | -1
C | | |
(3 rows)
rollback;
--
-- test incorrect handling of placeholders that only appear in targetlists,
-- per bug #6154
--
SELECT * FROM
( SELECT 1 as key1 ) sub1
LEFT JOIN
( SELECT sub3.key3, sub4.value2, COALESCE(sub4.value2, 66) as value3 FROM
( SELECT 1 as key3 ) sub3
LEFT JOIN
( SELECT sub5.key5, COALESCE(sub6.value1, 1) as value2 FROM
( SELECT 1 as key5 ) sub5
LEFT JOIN
( SELECT 2 as key6, 42 as value1 ) sub6
ON sub5.key5 = sub6.key6
) sub4
ON sub4.key5 = sub3.key3
) sub2
ON sub1.key1 = sub2.key3;
key1 | key3 | value2 | value3
------+------+--------+--------
1 | 1 | 1 | 1
(1 row)
-- test the path using join aliases, too
SELECT * FROM
( SELECT 1 as key1 ) sub1
LEFT JOIN
( SELECT sub3.key3, value2, COALESCE(value2, 66) as value3 FROM
( SELECT 1 as key3 ) sub3
LEFT JOIN
( SELECT sub5.key5, COALESCE(sub6.value1, 1) as value2 FROM
( SELECT 1 as key5 ) sub5
LEFT JOIN
( SELECT 2 as key6, 42 as value1 ) sub6
ON sub5.key5 = sub6.key6
) sub4
ON sub4.key5 = sub3.key3
) sub2
ON sub1.key1 = sub2.key3;
key1 | key3 | value2 | value3
------+------+--------+--------
1 | 1 | 1 | 1
(1 row)
--
-- test case where a PlaceHolderVar is used as a nestloop parameter
--
EXPLAIN (COSTS OFF)
SELECT qq, unique1
FROM
( SELECT COALESCE(q1, 0) AS qq FROM int8_tbl a ) AS ss1
FULL OUTER JOIN
( SELECT COALESCE(q2, -1) AS qq FROM int8_tbl b ) AS ss2
USING (qq)
INNER JOIN tenk1 c ON qq = unique2;
QUERY PLAN
---------------------------------------------------------------------------------------------------------
Nested Loop
-> Hash Full Join
Hash Cond: ((COALESCE(a.q1, '0'::bigint)) = (COALESCE(b.q2, '-1'::bigint)))
-> Seq Scan on int8_tbl a
-> Hash
-> Seq Scan on int8_tbl b
-> Index Scan using tenk1_unique2 on tenk1 c
Index Cond: (unique2 = COALESCE((COALESCE(a.q1, '0'::bigint)), (COALESCE(b.q2, '-1'::bigint))))
(8 rows)
SELECT qq, unique1
FROM
( SELECT COALESCE(q1, 0) AS qq FROM int8_tbl a ) AS ss1
FULL OUTER JOIN
( SELECT COALESCE(q2, -1) AS qq FROM int8_tbl b ) AS ss2
USING (qq)
INNER JOIN tenk1 c ON qq = unique2;
qq | unique1
-----+---------
123 | 4596
123 | 4596
456 | 7318
(3 rows)
--
-- nested nestloops can require nested PlaceHolderVars
--
create temp table nt1 (
id int primary key,
a1 boolean,
a2 boolean
);
create temp table nt2 (
id int primary key,
nt1_id int,
b1 boolean,
b2 boolean,
foreign key (nt1_id) references nt1(id)
);
create temp table nt3 (
id int primary key,
nt2_id int,
c1 boolean,
foreign key (nt2_id) references nt2(id)
);
insert into nt1 values (1,true,true);
insert into nt1 values (2,true,false);
insert into nt1 values (3,false,false);
insert into nt2 values (1,1,true,true);
insert into nt2 values (2,2,true,false);
insert into nt2 values (3,3,false,false);
insert into nt3 values (1,1,true);
insert into nt3 values (2,2,false);
insert into nt3 values (3,3,true);
explain (costs off)
select nt3.id
from nt3 as nt3
left join
(select nt2.*, (nt2.b1 and ss1.a3) AS b3
from nt2 as nt2
left join
(select nt1.*, (nt1.id is not null) as a3 from nt1) as ss1
on ss1.id = nt2.nt1_id
) as ss2
on ss2.id = nt3.nt2_id
where nt3.id = 1 and ss2.b3;
QUERY PLAN
-----------------------------------------------
Nested Loop
-> Nested Loop
-> Index Scan using nt3_pkey on nt3
Index Cond: (id = 1)
-> Index Scan using nt2_pkey on nt2
Index Cond: (id = nt3.nt2_id)
-> Index Only Scan using nt1_pkey on nt1
Index Cond: (id = nt2.nt1_id)
Filter: (nt2.b1 AND (id IS NOT NULL))
(9 rows)
select nt3.id
from nt3 as nt3
left join
(select nt2.*, (nt2.b1 and ss1.a3) AS b3
from nt2 as nt2
left join
(select nt1.*, (nt1.id is not null) as a3 from nt1) as ss1
on ss1.id = nt2.nt1_id
) as ss2
on ss2.id = nt3.nt2_id
where nt3.id = 1 and ss2.b3;
id
----
1
(1 row)
--
-- test case where a PlaceHolderVar is propagated into a subquery
--
explain (costs off)
select * from
int8_tbl t1 left join
(select q1 as x, 42 as y from int8_tbl t2) ss
on t1.q2 = ss.x
where
1 = (select 1 from int8_tbl t3 where ss.y is not null limit 1)
order by 1,2;
QUERY PLAN
-----------------------------------------------------------
Sort
Sort Key: t1.q1, t1.q2
-> Hash Left Join
Hash Cond: (t1.q2 = t2.q1)
Filter: (1 = (SubPlan 1))
-> Seq Scan on int8_tbl t1
-> Hash
-> Seq Scan on int8_tbl t2
SubPlan 1
-> Limit
-> Result
One-Time Filter: ((42) IS NOT NULL)
-> Seq Scan on int8_tbl t3
(13 rows)
select * from
int8_tbl t1 left join
(select q1 as x, 42 as y from int8_tbl t2) ss
on t1.q2 = ss.x
where
1 = (select 1 from int8_tbl t3 where ss.y is not null limit 1)
order by 1,2;
q1 | q2 | x | y
------------------+------------------+------------------+----
123 | 4567890123456789 | 4567890123456789 | 42
123 | 4567890123456789 | 4567890123456789 | 42
123 | 4567890123456789 | 4567890123456789 | 42
4567890123456789 | 123 | 123 | 42
4567890123456789 | 123 | 123 | 42
4567890123456789 | 4567890123456789 | 4567890123456789 | 42
4567890123456789 | 4567890123456789 | 4567890123456789 | 42
4567890123456789 | 4567890123456789 | 4567890123456789 | 42
(8 rows)
--
-- variant where a PlaceHolderVar is needed at a join, but not above the join
--
explain (costs off)
select * from
int4_tbl as i41,
lateral
(select 1 as x from
(select i41.f1 as lat,
i42.f1 as loc from
int8_tbl as i81, int4_tbl as i42) as ss1
right join int4_tbl as i43 on (i43.f1 > 1)
where ss1.loc = ss1.lat) as ss2
where i41.f1 > 0;
QUERY PLAN
--------------------------------------------------
Nested Loop
-> Nested Loop
-> Seq Scan on int4_tbl i41
Filter: (f1 > 0)
-> Nested Loop
Join Filter: (i41.f1 = i42.f1)
-> Seq Scan on int8_tbl i81
-> Materialize
-> Seq Scan on int4_tbl i42
-> Materialize
-> Seq Scan on int4_tbl i43
Filter: (f1 > 1)
(12 rows)
select * from
int4_tbl as i41,
lateral
(select 1 as x from
(select i41.f1 as lat,
i42.f1 as loc from
int8_tbl as i81, int4_tbl as i42) as ss1
right join int4_tbl as i43 on (i43.f1 > 1)
where ss1.loc = ss1.lat) as ss2
where i41.f1 > 0;
f1 | x
------------+---
123456 | 1
123456 | 1
123456 | 1
123456 | 1
123456 | 1
123456 | 1
123456 | 1
123456 | 1
123456 | 1
123456 | 1
2147483647 | 1
2147483647 | 1
2147483647 | 1
2147483647 | 1
2147483647 | 1
2147483647 | 1
2147483647 | 1
2147483647 | 1
2147483647 | 1
2147483647 | 1
(20 rows)
--
-- test the corner cases FULL JOIN ON TRUE and FULL JOIN ON FALSE
--
select * from int4_tbl a full join int4_tbl b on true;
f1 | f1
-------------+-------------
0 | 0
0 | 123456
0 | -123456
0 | 2147483647
0 | -2147483647
123456 | 0
123456 | 123456
123456 | -123456
123456 | 2147483647
123456 | -2147483647
-123456 | 0
-123456 | 123456
-123456 | -123456
-123456 | 2147483647
-123456 | -2147483647
2147483647 | 0
2147483647 | 123456
2147483647 | -123456
2147483647 | 2147483647
2147483647 | -2147483647
-2147483647 | 0
-2147483647 | 123456
-2147483647 | -123456
-2147483647 | 2147483647
-2147483647 | -2147483647
(25 rows)
select * from int4_tbl a full join int4_tbl b on false;
f1 | f1
-------------+-------------
| 0
| 123456
| -123456
| 2147483647
| -2147483647
0 |
123456 |
-123456 |
2147483647 |
-2147483647 |
(10 rows)
--
-- test for ability to use a cartesian join when necessary
--
create temp table q1 as select 1 as q1;
create temp table q2 as select 0 as q2;
analyze q1;
analyze q2;
explain (costs off)
select * from
tenk1 join int4_tbl on f1 = twothousand,
q1, q2
where q1 = thousand or q2 = thousand;
QUERY PLAN
------------------------------------------------------------------------
Hash Join
Hash Cond: (tenk1.twothousand = int4_tbl.f1)
-> Nested Loop
-> Nested Loop
-> Seq Scan on q1
-> Seq Scan on q2
-> Bitmap Heap Scan on tenk1
Recheck Cond: ((q1.q1 = thousand) OR (q2.q2 = thousand))
-> BitmapOr
-> Bitmap Index Scan on tenk1_thous_tenthous
Index Cond: (thousand = q1.q1)
-> Bitmap Index Scan on tenk1_thous_tenthous
Index Cond: (thousand = q2.q2)
-> Hash
-> Seq Scan on int4_tbl
(15 rows)
explain (costs off)
select * from
tenk1 join int4_tbl on f1 = twothousand,
q1, q2
where thousand = (q1 + q2);
QUERY PLAN
--------------------------------------------------------------
Hash Join
Hash Cond: (tenk1.twothousand = int4_tbl.f1)
-> Nested Loop
-> Nested Loop
-> Seq Scan on q1
-> Seq Scan on q2
-> Bitmap Heap Scan on tenk1
Recheck Cond: (thousand = (q1.q1 + q2.q2))
-> Bitmap Index Scan on tenk1_thous_tenthous
Index Cond: (thousand = (q1.q1 + q2.q2))
-> Hash
-> Seq Scan on int4_tbl
(12 rows)
--
-- test ability to generate a suitable plan for a star-schema query
--
explain (costs off)
select * from
tenk1, int8_tbl a, int8_tbl b
where thousand = a.q1 and tenthous = b.q1 and a.q2 = 1 and b.q2 = 2;
QUERY PLAN
---------------------------------------------------------------------
Nested Loop
-> Seq Scan on int8_tbl b
Filter: (q2 = 2)
-> Nested Loop
-> Seq Scan on int8_tbl a
Filter: (q2 = 1)
-> Index Scan using tenk1_thous_tenthous on tenk1
Index Cond: ((thousand = a.q1) AND (tenthous = b.q1))
(8 rows)
--
-- test a corner case in which we shouldn't apply the star-schema optimization
--
explain (costs off)
select t1.unique2, t1.stringu1, t2.unique1, t2.stringu2 from
tenk1 t1
inner join int4_tbl i1
left join (select v1.x2, v2.y1, 11 AS d1
from (select 1,0 from onerow) v1(x1,x2)
left join (select 3,1 from onerow) v2(y1,y2)
on v1.x1 = v2.y2) subq1
on (i1.f1 = subq1.x2)
on (t1.unique2 = subq1.d1)
left join tenk1 t2
on (subq1.y1 = t2.unique1)
where t1.unique2 < 42 and t1.stringu1 > t2.stringu2;
QUERY PLAN
-----------------------------------------------------------------------
Nested Loop
-> Nested Loop
Join Filter: (t1.stringu1 > t2.stringu2)
-> Nested Loop
-> Nested Loop
-> Seq Scan on onerow
-> Seq Scan on onerow onerow_1
-> Index Scan using tenk1_unique2 on tenk1 t1
Index Cond: ((unique2 = (11)) AND (unique2 < 42))
-> Index Scan using tenk1_unique1 on tenk1 t2
Index Cond: (unique1 = (3))
-> Seq Scan on int4_tbl i1
Filter: (f1 = 0)
(13 rows)
select t1.unique2, t1.stringu1, t2.unique1, t2.stringu2 from
tenk1 t1
inner join int4_tbl i1
left join (select v1.x2, v2.y1, 11 AS d1
from (select 1,0 from onerow) v1(x1,x2)
left join (select 3,1 from onerow) v2(y1,y2)
on v1.x1 = v2.y2) subq1
on (i1.f1 = subq1.x2)
on (t1.unique2 = subq1.d1)
left join tenk1 t2
on (subq1.y1 = t2.unique1)
where t1.unique2 < 42 and t1.stringu1 > t2.stringu2;
unique2 | stringu1 | unique1 | stringu2
---------+----------+---------+----------
11 | WFAAAA | 3 | LKIAAA
(1 row)
-- variant that isn't quite a star-schema case
select ss1.d1 from
tenk1 as t1
inner join tenk1 as t2
on t1.tenthous = t2.ten
inner join
int8_tbl as i8
left join int4_tbl as i4
inner join (select 64::information_schema.cardinal_number as d1
from tenk1 t3,
lateral (select abs(t3.unique1) + random()) ss0(x)
where t3.fivethous < 0) as ss1
on i4.f1 = ss1.d1
on i8.q1 = i4.f1
on t1.tenthous = ss1.d1
where t1.unique1 < i4.f1;
d1
----
(0 rows)
-- this variant is foldable by the remove-useless-RESULT-RTEs code
explain (costs off)
select t1.unique2, t1.stringu1, t2.unique1, t2.stringu2 from
tenk1 t1
inner join int4_tbl i1
left join (select v1.x2, v2.y1, 11 AS d1
from (values(1,0)) v1(x1,x2)
left join (values(3,1)) v2(y1,y2)
on v1.x1 = v2.y2) subq1
on (i1.f1 = subq1.x2)
on (t1.unique2 = subq1.d1)
left join tenk1 t2
on (subq1.y1 = t2.unique1)
where t1.unique2 < 42 and t1.stringu1 > t2.stringu2;
QUERY PLAN
-----------------------------------------------------------------
Nested Loop
Join Filter: (t1.stringu1 > t2.stringu2)
-> Nested Loop
-> Seq Scan on int4_tbl i1
Filter: (f1 = 0)
-> Index Scan using tenk1_unique2 on tenk1 t1
Index Cond: ((unique2 = (11)) AND (unique2 < 42))
-> Index Scan using tenk1_unique1 on tenk1 t2
Index Cond: (unique1 = (3))
(9 rows)
select t1.unique2, t1.stringu1, t2.unique1, t2.stringu2 from
tenk1 t1
inner join int4_tbl i1
left join (select v1.x2, v2.y1, 11 AS d1
from (values(1,0)) v1(x1,x2)
left join (values(3,1)) v2(y1,y2)
on v1.x1 = v2.y2) subq1
on (i1.f1 = subq1.x2)
on (t1.unique2 = subq1.d1)
left join tenk1 t2
on (subq1.y1 = t2.unique1)
where t1.unique2 < 42 and t1.stringu1 > t2.stringu2;
unique2 | stringu1 | unique1 | stringu2
---------+----------+---------+----------
11 | WFAAAA | 3 | LKIAAA
(1 row)
-- Here's a variant that we can't fold too aggressively, though,
-- or we end up with noplace to evaluate the lateral PHV
explain (verbose, costs off)
select * from
(select 1 as x) ss1 left join (select 2 as y) ss2 on (true),
lateral (select ss2.y as z limit 1) ss3;
QUERY PLAN
---------------------------
Nested Loop
Output: 1, (2), ((2))
-> Result
Output: 2
-> Limit
Output: ((2))
-> Result
Output: (2)
(8 rows)
select * from
(select 1 as x) ss1 left join (select 2 as y) ss2 on (true),
lateral (select ss2.y as z limit 1) ss3;
x | y | z
---+---+---
1 | 2 | 2
(1 row)
-- Test proper handling of appendrel PHVs during useless-RTE removal
explain (costs off)
select * from
(select 0 as z) as t1
left join
(select true as a) as t2
on true,
lateral (select true as b
union all
select a as b) as t3
where b;
QUERY PLAN
---------------------------------------
Nested Loop
-> Result
-> Append
-> Result
-> Result
One-Time Filter: (true)
(6 rows)
select * from
(select 0 as z) as t1
left join
(select true as a) as t2
on true,
lateral (select true as b
union all
select a as b) as t3
where b;
z | a | b
---+---+---
0 | t | t
0 | t | t
(2 rows)
--
-- test inlining of immutable functions
--
create function f_immutable_int4(i integer) returns integer as
$$ begin return i; end; $$ language plpgsql immutable;
-- check optimization of function scan with join
explain (costs off)
select unique1 from tenk1, (select * from f_immutable_int4(1) x) x
where x = unique1;
QUERY PLAN
----------------------------------------------
Index Only Scan using tenk1_unique1 on tenk1
Index Cond: (unique1 = 1)
(2 rows)
explain (verbose, costs off)
select unique1, x.*
from tenk1, (select *, random() from f_immutable_int4(1) x) x
where x = unique1;
QUERY PLAN
-----------------------------------------------------------
Nested Loop
Output: tenk1.unique1, (1), (random())
-> Result
Output: 1, random()
-> Index Only Scan using tenk1_unique1 on public.tenk1
Output: tenk1.unique1
Index Cond: (tenk1.unique1 = (1))
(7 rows)
explain (costs off)
select unique1 from tenk1, f_immutable_int4(1) x where x = unique1;
QUERY PLAN
----------------------------------------------
Index Only Scan using tenk1_unique1 on tenk1
Index Cond: (unique1 = 1)
(2 rows)
explain (costs off)
select unique1 from tenk1, lateral f_immutable_int4(1) x where x = unique1;
QUERY PLAN
----------------------------------------------
Index Only Scan using tenk1_unique1 on tenk1
Index Cond: (unique1 = 1)
(2 rows)
explain (costs off)
select unique1 from tenk1, lateral f_immutable_int4(1) x where x in (select 17);
QUERY PLAN
--------------------------
Result
One-Time Filter: false
(2 rows)
explain (costs off)
select unique1, x from tenk1 join f_immutable_int4(1) x on unique1 = x;
QUERY PLAN
----------------------------------------------
Index Only Scan using tenk1_unique1 on tenk1
Index Cond: (unique1 = 1)
(2 rows)
explain (costs off)
select unique1, x from tenk1 left join f_immutable_int4(1) x on unique1 = x;
QUERY PLAN
----------------------------------------------------
Nested Loop Left Join
Join Filter: (tenk1.unique1 = 1)
-> Index Only Scan using tenk1_unique1 on tenk1
-> Materialize
-> Result
(5 rows)
explain (costs off)
select unique1, x from tenk1 right join f_immutable_int4(1) x on unique1 = x;
QUERY PLAN
----------------------------------------------------
Nested Loop Left Join
-> Result
-> Index Only Scan using tenk1_unique1 on tenk1
Index Cond: (unique1 = 1)
(4 rows)
explain (costs off)
select unique1, x from tenk1 full join f_immutable_int4(1) x on unique1 = x;
QUERY PLAN
----------------------------------------------------
Merge Full Join
Merge Cond: (tenk1.unique1 = (1))
-> Index Only Scan using tenk1_unique1 on tenk1
-> Sort
Sort Key: (1)
-> Result
(6 rows)
-- check that pullup of a const function allows further const-folding
explain (costs off)
select unique1 from tenk1, f_immutable_int4(1) x where x = 42;
QUERY PLAN
--------------------------
Result
One-Time Filter: false
(2 rows)
-- test inlining of immutable functions with PlaceHolderVars
explain (costs off)
select nt3.id
from nt3 as nt3
left join
(select nt2.*, (nt2.b1 or i4 = 42) AS b3
from nt2 as nt2
left join
f_immutable_int4(0) i4
on i4 = nt2.nt1_id
) as ss2
on ss2.id = nt3.nt2_id
where nt3.id = 1 and ss2.b3;
QUERY PLAN
----------------------------------------------
Nested Loop Left Join
Filter: ((nt2.b1 OR ((0) = 42)))
-> Index Scan using nt3_pkey on nt3
Index Cond: (id = 1)
-> Nested Loop Left Join
Join Filter: (0 = nt2.nt1_id)
-> Index Scan using nt2_pkey on nt2
Index Cond: (id = nt3.nt2_id)
-> Result
(9 rows)
drop function f_immutable_int4(int);
-- test inlining when function returns composite
create function mki8(bigint, bigint) returns int8_tbl as
$$select row($1,$2)::int8_tbl$$ language sql;
create function mki4(int) returns int4_tbl as
$$select row($1)::int4_tbl$$ language sql;
explain (verbose, costs off)
select * from mki8(1,2);
QUERY PLAN
------------------------------------
Function Scan on mki8
Output: q1, q2
Function Call: '(1,2)'::int8_tbl
(3 rows)
select * from mki8(1,2);
q1 | q2
----+----
1 | 2
(1 row)
explain (verbose, costs off)
select * from mki4(42);
QUERY PLAN
-----------------------------------
Function Scan on mki4
Output: f1
Function Call: '(42)'::int4_tbl
(3 rows)
select * from mki4(42);
f1
----
42
(1 row)
drop function mki8(bigint, bigint);
drop function mki4(int);
--
-- test extraction of restriction OR clauses from join OR clause
-- (we used to only do this for indexable clauses)
--
explain (costs off)
select * from tenk1 a join tenk1 b on
(a.unique1 = 1 and b.unique1 = 2) or (a.unique2 = 3 and b.hundred = 4);
QUERY PLAN
-------------------------------------------------------------------------------------------------
Nested Loop
Join Filter: (((a.unique1 = 1) AND (b.unique1 = 2)) OR ((a.unique2 = 3) AND (b.hundred = 4)))
-> Bitmap Heap Scan on tenk1 b
Recheck Cond: ((unique1 = 2) OR (hundred = 4))
-> BitmapOr
-> Bitmap Index Scan on tenk1_unique1
Index Cond: (unique1 = 2)
-> Bitmap Index Scan on tenk1_hundred
Index Cond: (hundred = 4)
-> Materialize
-> Bitmap Heap Scan on tenk1 a
Recheck Cond: ((unique1 = 1) OR (unique2 = 3))
-> BitmapOr
-> Bitmap Index Scan on tenk1_unique1
Index Cond: (unique1 = 1)
-> Bitmap Index Scan on tenk1_unique2
Index Cond: (unique2 = 3)
(17 rows)
explain (costs off)
select * from tenk1 a join tenk1 b on
(a.unique1 = 1 and b.unique1 = 2) or (a.unique2 = 3 and b.ten = 4);
QUERY PLAN
---------------------------------------------------------------------------------------------
Nested Loop
Join Filter: (((a.unique1 = 1) AND (b.unique1 = 2)) OR ((a.unique2 = 3) AND (b.ten = 4)))
-> Seq Scan on tenk1 b
Filter: ((unique1 = 2) OR (ten = 4))
-> Materialize
-> Bitmap Heap Scan on tenk1 a
Recheck Cond: ((unique1 = 1) OR (unique2 = 3))
-> BitmapOr
-> Bitmap Index Scan on tenk1_unique1
Index Cond: (unique1 = 1)
-> Bitmap Index Scan on tenk1_unique2
Index Cond: (unique2 = 3)
(12 rows)
explain (costs off)
select * from tenk1 a join tenk1 b on
(a.unique1 = 1 and b.unique1 = 2) or
((a.unique2 = 3 or a.unique2 = 7) and b.hundred = 4);
QUERY PLAN
----------------------------------------------------------------------------------------------------------------------
Nested Loop
Join Filter: (((a.unique1 = 1) AND (b.unique1 = 2)) OR (((a.unique2 = 3) OR (a.unique2 = 7)) AND (b.hundred = 4)))
-> Bitmap Heap Scan on tenk1 b
Recheck Cond: ((unique1 = 2) OR (hundred = 4))
-> BitmapOr
-> Bitmap Index Scan on tenk1_unique1
Index Cond: (unique1 = 2)
-> Bitmap Index Scan on tenk1_hundred
Index Cond: (hundred = 4)
-> Materialize
-> Bitmap Heap Scan on tenk1 a
Recheck Cond: ((unique1 = 1) OR (unique2 = 3) OR (unique2 = 7))
-> BitmapOr
-> Bitmap Index Scan on tenk1_unique1
Index Cond: (unique1 = 1)
-> Bitmap Index Scan on tenk1_unique2
Index Cond: (unique2 = 3)
-> Bitmap Index Scan on tenk1_unique2
Index Cond: (unique2 = 7)
(19 rows)
--
-- test placement of movable quals in a parameterized join tree
--
explain (costs off)
select * from tenk1 t1 left join
(tenk1 t2 join tenk1 t3 on t2.thousand = t3.unique2)
on t1.hundred = t2.hundred and t1.ten = t3.ten
where t1.unique1 = 1;
QUERY PLAN
--------------------------------------------------------------
Nested Loop Left Join
-> Index Scan using tenk1_unique1 on tenk1 t1
Index Cond: (unique1 = 1)
-> Nested Loop
Join Filter: (t1.ten = t3.ten)
-> Bitmap Heap Scan on tenk1 t2
Recheck Cond: (t1.hundred = hundred)
-> Bitmap Index Scan on tenk1_hundred
Index Cond: (hundred = t1.hundred)
-> Memoize
Cache Key: t2.thousand
Cache Mode: logical
-> Index Scan using tenk1_unique2 on tenk1 t3
Index Cond: (unique2 = t2.thousand)
(14 rows)
explain (costs off)
select * from tenk1 t1 left join
(tenk1 t2 join tenk1 t3 on t2.thousand = t3.unique2)
on t1.hundred = t2.hundred and t1.ten + t2.ten = t3.ten
where t1.unique1 = 1;
QUERY PLAN
--------------------------------------------------------------
Nested Loop Left Join
-> Index Scan using tenk1_unique1 on tenk1 t1
Index Cond: (unique1 = 1)
-> Nested Loop
Join Filter: ((t1.ten + t2.ten) = t3.ten)
-> Bitmap Heap Scan on tenk1 t2
Recheck Cond: (t1.hundred = hundred)
-> Bitmap Index Scan on tenk1_hundred
Index Cond: (hundred = t1.hundred)
-> Memoize
Cache Key: t2.thousand
Cache Mode: logical
-> Index Scan using tenk1_unique2 on tenk1 t3
Index Cond: (unique2 = t2.thousand)
(14 rows)
explain (costs off)
select count(*) from
tenk1 a join tenk1 b on a.unique1 = b.unique2
left join tenk1 c on a.unique2 = b.unique1 and c.thousand = a.thousand
join int4_tbl on b.thousand = f1;
QUERY PLAN
-------------------------------------------------------------------------
Aggregate
-> Nested Loop Left Join
Join Filter: (a.unique2 = b.unique1)
-> Nested Loop
-> Nested Loop
-> Seq Scan on int4_tbl
-> Bitmap Heap Scan on tenk1 b
Recheck Cond: (thousand = int4_tbl.f1)
-> Bitmap Index Scan on tenk1_thous_tenthous
Index Cond: (thousand = int4_tbl.f1)
-> Index Scan using tenk1_unique1 on tenk1 a
Index Cond: (unique1 = b.unique2)
-> Index Only Scan using tenk1_thous_tenthous on tenk1 c
Index Cond: (thousand = a.thousand)
(14 rows)
select count(*) from
tenk1 a join tenk1 b on a.unique1 = b.unique2
left join tenk1 c on a.unique2 = b.unique1 and c.thousand = a.thousand
join int4_tbl on b.thousand = f1;
count
-------
10
(1 row)
explain (costs off)
select b.unique1 from
tenk1 a join tenk1 b on a.unique1 = b.unique2
left join tenk1 c on b.unique1 = 42 and c.thousand = a.thousand
join int4_tbl i1 on b.thousand = f1
right join int4_tbl i2 on i2.f1 = b.tenthous
order by 1;
QUERY PLAN
-----------------------------------------------------------------------------------------
Sort
Sort Key: b.unique1
-> Nested Loop Left Join
-> Seq Scan on int4_tbl i2
-> Nested Loop Left Join
Join Filter: (b.unique1 = 42)
-> Nested Loop
-> Nested Loop
-> Seq Scan on int4_tbl i1
-> Index Scan using tenk1_thous_tenthous on tenk1 b
Index Cond: ((thousand = i1.f1) AND (tenthous = i2.f1))
-> Index Scan using tenk1_unique1 on tenk1 a
Index Cond: (unique1 = b.unique2)
-> Index Only Scan using tenk1_thous_tenthous on tenk1 c
Index Cond: (thousand = a.thousand)
(15 rows)
select b.unique1 from
tenk1 a join tenk1 b on a.unique1 = b.unique2
left join tenk1 c on b.unique1 = 42 and c.thousand = a.thousand
join int4_tbl i1 on b.thousand = f1
right join int4_tbl i2 on i2.f1 = b.tenthous
order by 1;
unique1
---------
0
(5 rows)
explain (costs off)
select * from
(
select unique1, q1, coalesce(unique1, -1) + q1 as fault
from int8_tbl left join tenk1 on (q2 = unique2)
) ss
where fault = 122
order by fault;
QUERY PLAN
--------------------------------------------------------------------------
Nested Loop Left Join
Filter: ((COALESCE(tenk1.unique1, '-1'::integer) + int8_tbl.q1) = 122)
-> Seq Scan on int8_tbl
-> Index Scan using tenk1_unique2 on tenk1
Index Cond: (unique2 = int8_tbl.q2)
(5 rows)
select * from
(
select unique1, q1, coalesce(unique1, -1) + q1 as fault
from int8_tbl left join tenk1 on (q2 = unique2)
) ss
where fault = 122
order by fault;
unique1 | q1 | fault
---------+-----+-------
| 123 | 122
(1 row)
explain (costs off)
select * from
(values (1, array[10,20]), (2, array[20,30])) as v1(v1x,v1ys)
left join (values (1, 10), (2, 20)) as v2(v2x,v2y) on v2x = v1x
left join unnest(v1ys) as u1(u1y) on u1y = v2y;
QUERY PLAN
-------------------------------------------------------------
Nested Loop Left Join
-> Values Scan on "*VALUES*"
-> Hash Right Join
Hash Cond: (u1.u1y = "*VALUES*_1".column2)
Filter: ("*VALUES*_1".column1 = "*VALUES*".column1)
-> Function Scan on unnest u1
-> Hash
-> Values Scan on "*VALUES*_1"
(8 rows)
select * from
(values (1, array[10,20]), (2, array[20,30])) as v1(v1x,v1ys)
left join (values (1, 10), (2, 20)) as v2(v2x,v2y) on v2x = v1x
left join unnest(v1ys) as u1(u1y) on u1y = v2y;
v1x | v1ys | v2x | v2y | u1y
-----+---------+-----+-----+-----
1 | {10,20} | 1 | 10 | 10
2 | {20,30} | 2 | 20 | 20
(2 rows)
--
-- test handling of potential equivalence clauses above outer joins
--
explain (costs off)
select q1, unique2, thousand, hundred
from int8_tbl a left join tenk1 b on q1 = unique2
where coalesce(thousand,123) = q1 and q1 = coalesce(hundred,123);
QUERY PLAN
--------------------------------------------------------------------------------------
Nested Loop Left Join
Filter: ((COALESCE(b.thousand, 123) = a.q1) AND (a.q1 = COALESCE(b.hundred, 123)))
-> Seq Scan on int8_tbl a
-> Index Scan using tenk1_unique2 on tenk1 b
Index Cond: (unique2 = a.q1)
(5 rows)
select q1, unique2, thousand, hundred
from int8_tbl a left join tenk1 b on q1 = unique2
where coalesce(thousand,123) = q1 and q1 = coalesce(hundred,123);
q1 | unique2 | thousand | hundred
----+---------+----------+---------
(0 rows)
explain (costs off)
select f1, unique2, case when unique2 is null then f1 else 0 end
from int4_tbl a left join tenk1 b on f1 = unique2
where (case when unique2 is null then f1 else 0 end) = 0;
QUERY PLAN
--------------------------------------------------------------------
Nested Loop Left Join
Filter: (CASE WHEN (b.unique2 IS NULL) THEN a.f1 ELSE 0 END = 0)
-> Seq Scan on int4_tbl a
-> Index Only Scan using tenk1_unique2 on tenk1 b
Index Cond: (unique2 = a.f1)
(5 rows)
select f1, unique2, case when unique2 is null then f1 else 0 end
from int4_tbl a left join tenk1 b on f1 = unique2
where (case when unique2 is null then f1 else 0 end) = 0;
f1 | unique2 | case
----+---------+------
0 | 0 | 0
(1 row)
--
-- another case with equivalence clauses above outer joins (bug #8591)
--
explain (costs off)
select a.unique1, b.unique1, c.unique1, coalesce(b.twothousand, a.twothousand)
from tenk1 a left join tenk1 b on b.thousand = a.unique1 left join tenk1 c on c.unique2 = coalesce(b.twothousand, a.twothousand)
where a.unique2 < 10 and coalesce(b.twothousand, a.twothousand) = 44;
QUERY PLAN
---------------------------------------------------------------------------------------------
Nested Loop Left Join
-> Nested Loop Left Join
Filter: (COALESCE(b.twothousand, a.twothousand) = 44)
-> Index Scan using tenk1_unique2 on tenk1 a
Index Cond: (unique2 < 10)
-> Bitmap Heap Scan on tenk1 b
Recheck Cond: (thousand = a.unique1)
-> Bitmap Index Scan on tenk1_thous_tenthous
Index Cond: (thousand = a.unique1)
-> Index Scan using tenk1_unique2 on tenk1 c
Index Cond: ((unique2 = COALESCE(b.twothousand, a.twothousand)) AND (unique2 = 44))
(11 rows)
select a.unique1, b.unique1, c.unique1, coalesce(b.twothousand, a.twothousand)
from tenk1 a left join tenk1 b on b.thousand = a.unique1 left join tenk1 c on c.unique2 = coalesce(b.twothousand, a.twothousand)
where a.unique2 < 10 and coalesce(b.twothousand, a.twothousand) = 44;
unique1 | unique1 | unique1 | coalesce
---------+---------+---------+----------
(0 rows)
--
-- check handling of join aliases when flattening multiple levels of subquery
--
explain (verbose, costs off)
select foo1.join_key as foo1_id, foo3.join_key AS foo3_id, bug_field from
(values (0),(1)) foo1(join_key)
left join
(select join_key, bug_field from
(select ss1.join_key, ss1.bug_field from
(select f1 as join_key, 666 as bug_field from int4_tbl i1) ss1
) foo2
left join
(select unique2 as join_key from tenk1 i2) ss2
using (join_key)
) foo3
using (join_key);
QUERY PLAN
--------------------------------------------------------------------------
Nested Loop Left Join
Output: "*VALUES*".column1, i1.f1, (666)
Join Filter: ("*VALUES*".column1 = i1.f1)
-> Values Scan on "*VALUES*"
Output: "*VALUES*".column1
-> Materialize
Output: i1.f1, (666)
-> Nested Loop Left Join
Output: i1.f1, 666
-> Seq Scan on public.int4_tbl i1
Output: i1.f1
-> Index Only Scan using tenk1_unique2 on public.tenk1 i2
Output: i2.unique2
Index Cond: (i2.unique2 = i1.f1)
(14 rows)
select foo1.join_key as foo1_id, foo3.join_key AS foo3_id, bug_field from
(values (0),(1)) foo1(join_key)
left join
(select join_key, bug_field from
(select ss1.join_key, ss1.bug_field from
(select f1 as join_key, 666 as bug_field from int4_tbl i1) ss1
) foo2
left join
(select unique2 as join_key from tenk1 i2) ss2
using (join_key)
) foo3
using (join_key);
foo1_id | foo3_id | bug_field
---------+---------+-----------
0 | 0 | 666
1 | |
(2 rows)
--
-- test successful handling of nested outer joins with degenerate join quals
--
explain (verbose, costs off)
select t1.* from
text_tbl t1
left join (select *, '***'::text as d1 from int8_tbl i8b1) b1
left join int8_tbl i8
left join (select *, null::int as d2 from int8_tbl i8b2) b2
on (i8.q1 = b2.q1)
on (b2.d2 = b1.q2)
on (t1.f1 = b1.d1)
left join int4_tbl i4
on (i8.q2 = i4.f1);
QUERY PLAN
----------------------------------------------------------------------
Hash Left Join
Output: t1.f1
Hash Cond: (i8.q2 = i4.f1)
-> Nested Loop Left Join
Output: t1.f1, i8.q2
Join Filter: (t1.f1 = '***'::text)
-> Seq Scan on public.text_tbl t1
Output: t1.f1
-> Materialize
Output: i8.q2
-> Hash Right Join
Output: i8.q2
Hash Cond: ((NULL::integer) = i8b1.q2)
-> Hash Join
Output: i8.q2, (NULL::integer)
Hash Cond: (i8.q1 = i8b2.q1)
-> Seq Scan on public.int8_tbl i8
Output: i8.q1, i8.q2
-> Hash
Output: i8b2.q1, (NULL::integer)
-> Seq Scan on public.int8_tbl i8b2
Output: i8b2.q1, NULL::integer
-> Hash
Output: i8b1.q2
-> Seq Scan on public.int8_tbl i8b1
Output: i8b1.q2
-> Hash
Output: i4.f1
-> Seq Scan on public.int4_tbl i4
Output: i4.f1
(30 rows)
select t1.* from
text_tbl t1
left join (select *, '***'::text as d1 from int8_tbl i8b1) b1
left join int8_tbl i8
left join (select *, null::int as d2 from int8_tbl i8b2) b2
on (i8.q1 = b2.q1)
on (b2.d2 = b1.q2)
on (t1.f1 = b1.d1)
left join int4_tbl i4
on (i8.q2 = i4.f1);
f1
-------------------
doh!
hi de ho neighbor
(2 rows)
explain (verbose, costs off)
select t1.* from
text_tbl t1
left join (select *, '***'::text as d1 from int8_tbl i8b1) b1
left join int8_tbl i8
left join (select *, null::int as d2 from int8_tbl i8b2, int4_tbl i4b2) b2
on (i8.q1 = b2.q1)
on (b2.d2 = b1.q2)
on (t1.f1 = b1.d1)
left join int4_tbl i4
on (i8.q2 = i4.f1);
QUERY PLAN
----------------------------------------------------------------------------
Hash Left Join
Output: t1.f1
Hash Cond: (i8.q2 = i4.f1)
-> Nested Loop Left Join
Output: t1.f1, i8.q2
Join Filter: (t1.f1 = '***'::text)
-> Seq Scan on public.text_tbl t1
Output: t1.f1
-> Materialize
Output: i8.q2
-> Hash Right Join
Output: i8.q2
Hash Cond: ((NULL::integer) = i8b1.q2)
-> Hash Right Join
Output: i8.q2, (NULL::integer)
Hash Cond: (i8b2.q1 = i8.q1)
-> Nested Loop
Output: i8b2.q1, NULL::integer
-> Seq Scan on public.int8_tbl i8b2
Output: i8b2.q1, i8b2.q2
-> Materialize
-> Seq Scan on public.int4_tbl i4b2
-> Hash
Output: i8.q1, i8.q2
-> Seq Scan on public.int8_tbl i8
Output: i8.q1, i8.q2
-> Hash
Output: i8b1.q2
-> Seq Scan on public.int8_tbl i8b1
Output: i8b1.q2
-> Hash
Output: i4.f1
-> Seq Scan on public.int4_tbl i4
Output: i4.f1
(34 rows)
select t1.* from
text_tbl t1
left join (select *, '***'::text as d1 from int8_tbl i8b1) b1
left join int8_tbl i8
left join (select *, null::int as d2 from int8_tbl i8b2, int4_tbl i4b2) b2
on (i8.q1 = b2.q1)
on (b2.d2 = b1.q2)
on (t1.f1 = b1.d1)
left join int4_tbl i4
on (i8.q2 = i4.f1);
f1
-------------------
doh!
hi de ho neighbor
(2 rows)
explain (verbose, costs off)
select t1.* from
text_tbl t1
left join (select *, '***'::text as d1 from int8_tbl i8b1) b1
left join int8_tbl i8
left join (select *, null::int as d2 from int8_tbl i8b2, int4_tbl i4b2
where q1 = f1) b2
on (i8.q1 = b2.q1)
on (b2.d2 = b1.q2)
on (t1.f1 = b1.d1)
left join int4_tbl i4
on (i8.q2 = i4.f1);
QUERY PLAN
----------------------------------------------------------------------------
Hash Left Join
Output: t1.f1
Hash Cond: (i8.q2 = i4.f1)
-> Nested Loop Left Join
Output: t1.f1, i8.q2
Join Filter: (t1.f1 = '***'::text)
-> Seq Scan on public.text_tbl t1
Output: t1.f1
-> Materialize
Output: i8.q2
-> Hash Right Join
Output: i8.q2
Hash Cond: ((NULL::integer) = i8b1.q2)
-> Hash Right Join
Output: i8.q2, (NULL::integer)
Hash Cond: (i8b2.q1 = i8.q1)
-> Hash Join
Output: i8b2.q1, NULL::integer
Hash Cond: (i8b2.q1 = i4b2.f1)
-> Seq Scan on public.int8_tbl i8b2
Output: i8b2.q1, i8b2.q2
-> Hash
Output: i4b2.f1
-> Seq Scan on public.int4_tbl i4b2
Output: i4b2.f1
-> Hash
Output: i8.q1, i8.q2
-> Seq Scan on public.int8_tbl i8
Output: i8.q1, i8.q2
-> Hash
Output: i8b1.q2
-> Seq Scan on public.int8_tbl i8b1
Output: i8b1.q2
-> Hash
Output: i4.f1
-> Seq Scan on public.int4_tbl i4
Output: i4.f1
(37 rows)
select t1.* from
text_tbl t1
left join (select *, '***'::text as d1 from int8_tbl i8b1) b1
left join int8_tbl i8
left join (select *, null::int as d2 from int8_tbl i8b2, int4_tbl i4b2
where q1 = f1) b2
on (i8.q1 = b2.q1)
on (b2.d2 = b1.q2)
on (t1.f1 = b1.d1)
left join int4_tbl i4
on (i8.q2 = i4.f1);
f1
-------------------
doh!
hi de ho neighbor
(2 rows)
explain (verbose, costs off)
select * from
text_tbl t1
inner join int8_tbl i8
on i8.q2 = 456
right join text_tbl t2
on t1.f1 = 'doh!'
left join int4_tbl i4
on i8.q1 = i4.f1;
QUERY PLAN
--------------------------------------------------------
Nested Loop Left Join
Output: t1.f1, i8.q1, i8.q2, t2.f1, i4.f1
-> Seq Scan on public.text_tbl t2
Output: t2.f1
-> Materialize
Output: i8.q1, i8.q2, i4.f1, t1.f1
-> Nested Loop
Output: i8.q1, i8.q2, i4.f1, t1.f1
-> Nested Loop Left Join
Output: i8.q1, i8.q2, i4.f1
Join Filter: (i8.q1 = i4.f1)
-> Seq Scan on public.int8_tbl i8
Output: i8.q1, i8.q2
Filter: (i8.q2 = 456)
-> Seq Scan on public.int4_tbl i4
Output: i4.f1
-> Seq Scan on public.text_tbl t1
Output: t1.f1
Filter: (t1.f1 = 'doh!'::text)
(19 rows)
select * from
text_tbl t1
inner join int8_tbl i8
on i8.q2 = 456
right join text_tbl t2
on t1.f1 = 'doh!'
left join int4_tbl i4
on i8.q1 = i4.f1;
f1 | q1 | q2 | f1 | f1
------+-----+-----+-------------------+----
doh! | 123 | 456 | doh! |
doh! | 123 | 456 | hi de ho neighbor |
(2 rows)
--
-- test for appropriate join order in the presence of lateral references
--
explain (verbose, costs off)
select * from
text_tbl t1
left join int8_tbl i8
on i8.q2 = 123,
lateral (select i8.q1, t2.f1 from text_tbl t2 limit 1) as ss
where t1.f1 = ss.f1;
QUERY PLAN
--------------------------------------------------
Nested Loop
Output: t1.f1, i8.q1, i8.q2, (i8.q1), t2.f1
Join Filter: (t1.f1 = t2.f1)
-> Nested Loop Left Join
Output: t1.f1, i8.q1, i8.q2
-> Seq Scan on public.text_tbl t1
Output: t1.f1
-> Materialize
Output: i8.q1, i8.q2
-> Seq Scan on public.int8_tbl i8
Output: i8.q1, i8.q2
Filter: (i8.q2 = 123)
-> Memoize
Output: (i8.q1), t2.f1
Cache Key: i8.q1
Cache Mode: binary
-> Limit
Output: (i8.q1), t2.f1
-> Seq Scan on public.text_tbl t2
Output: i8.q1, t2.f1
(20 rows)
select * from
text_tbl t1
left join int8_tbl i8
on i8.q2 = 123,
lateral (select i8.q1, t2.f1 from text_tbl t2 limit 1) as ss
where t1.f1 = ss.f1;
f1 | q1 | q2 | q1 | f1
------+------------------+-----+------------------+------
doh! | 4567890123456789 | 123 | 4567890123456789 | doh!
(1 row)
explain (verbose, costs off)
select * from
text_tbl t1
left join int8_tbl i8
on i8.q2 = 123,
lateral (select i8.q1, t2.f1 from text_tbl t2 limit 1) as ss1,
lateral (select ss1.* from text_tbl t3 limit 1) as ss2
where t1.f1 = ss2.f1;
QUERY PLAN
-------------------------------------------------------------------
Nested Loop
Output: t1.f1, i8.q1, i8.q2, (i8.q1), t2.f1, ((i8.q1)), (t2.f1)
Join Filter: (t1.f1 = (t2.f1))
-> Nested Loop
Output: t1.f1, i8.q1, i8.q2, (i8.q1), t2.f1
-> Nested Loop Left Join
Output: t1.f1, i8.q1, i8.q2
-> Seq Scan on public.text_tbl t1
Output: t1.f1
-> Materialize
Output: i8.q1, i8.q2
-> Seq Scan on public.int8_tbl i8
Output: i8.q1, i8.q2
Filter: (i8.q2 = 123)
-> Memoize
Output: (i8.q1), t2.f1
Cache Key: i8.q1
Cache Mode: binary
-> Limit
Output: (i8.q1), t2.f1
-> Seq Scan on public.text_tbl t2
Output: i8.q1, t2.f1
-> Memoize
Output: ((i8.q1)), (t2.f1)
Cache Key: (i8.q1), t2.f1
Cache Mode: binary
-> Limit
Output: ((i8.q1)), (t2.f1)
-> Seq Scan on public.text_tbl t3
Output: (i8.q1), t2.f1
(30 rows)
select * from
text_tbl t1
left join int8_tbl i8
on i8.q2 = 123,
lateral (select i8.q1, t2.f1 from text_tbl t2 limit 1) as ss1,
lateral (select ss1.* from text_tbl t3 limit 1) as ss2
where t1.f1 = ss2.f1;
f1 | q1 | q2 | q1 | f1 | q1 | f1
------+------------------+-----+------------------+------+------------------+------
doh! | 4567890123456789 | 123 | 4567890123456789 | doh! | 4567890123456789 | doh!
(1 row)
explain (verbose, costs off)
select 1 from
text_tbl as tt1
inner join text_tbl as tt2 on (tt1.f1 = 'foo')
left join text_tbl as tt3 on (tt3.f1 = 'foo')
left join text_tbl as tt4 on (tt3.f1 = tt4.f1),
lateral (select tt4.f1 as c0 from text_tbl as tt5 limit 1) as ss1
where tt1.f1 = ss1.c0;
QUERY PLAN
----------------------------------------------------------
Nested Loop
Output: 1
-> Nested Loop Left Join
Output: tt1.f1, tt4.f1
-> Nested Loop
Output: tt1.f1
-> Seq Scan on public.text_tbl tt1
Output: tt1.f1
Filter: (tt1.f1 = 'foo'::text)
-> Seq Scan on public.text_tbl tt2
Output: tt2.f1
-> Materialize
Output: tt4.f1
-> Nested Loop Left Join
Output: tt4.f1
Join Filter: (tt3.f1 = tt4.f1)
-> Seq Scan on public.text_tbl tt3
Output: tt3.f1
Filter: (tt3.f1 = 'foo'::text)
-> Seq Scan on public.text_tbl tt4
Output: tt4.f1
Filter: (tt4.f1 = 'foo'::text)
-> Memoize
Output: ss1.c0
Cache Key: tt4.f1
Cache Mode: binary
-> Subquery Scan on ss1
Output: ss1.c0
Filter: (ss1.c0 = 'foo'::text)
-> Limit
Output: (tt4.f1)
-> Seq Scan on public.text_tbl tt5
Output: tt4.f1
(33 rows)
select 1 from
text_tbl as tt1
inner join text_tbl as tt2 on (tt1.f1 = 'foo')
left join text_tbl as tt3 on (tt3.f1 = 'foo')
left join text_tbl as tt4 on (tt3.f1 = tt4.f1),
lateral (select tt4.f1 as c0 from text_tbl as tt5 limit 1) as ss1
where tt1.f1 = ss1.c0;
?column?
----------
(0 rows)
--
-- check a case in which a PlaceHolderVar forces join order
--
explain (verbose, costs off)
select ss2.* from
int4_tbl i41
left join int8_tbl i8
join (select i42.f1 as c1, i43.f1 as c2, 42 as c3
from int4_tbl i42, int4_tbl i43) ss1
on i8.q1 = ss1.c2
on i41.f1 = ss1.c1,
lateral (select i41.*, i8.*, ss1.* from text_tbl limit 1) ss2
where ss1.c2 = 0;
QUERY PLAN
------------------------------------------------------------------------
Nested Loop
Output: (i41.f1), (i8.q1), (i8.q2), (i42.f1), (i43.f1), ((42))
-> Hash Join
Output: i41.f1, i42.f1, i8.q1, i8.q2, i43.f1, 42
Hash Cond: (i41.f1 = i42.f1)
-> Nested Loop
Output: i8.q1, i8.q2, i43.f1, i41.f1
-> Nested Loop
Output: i8.q1, i8.q2, i43.f1
-> Seq Scan on public.int8_tbl i8
Output: i8.q1, i8.q2
Filter: (i8.q1 = 0)
-> Seq Scan on public.int4_tbl i43
Output: i43.f1
Filter: (i43.f1 = 0)
-> Seq Scan on public.int4_tbl i41
Output: i41.f1
-> Hash
Output: i42.f1
-> Seq Scan on public.int4_tbl i42
Output: i42.f1
-> Limit
Output: (i41.f1), (i8.q1), (i8.q2), (i42.f1), (i43.f1), ((42))
-> Seq Scan on public.text_tbl
Output: i41.f1, i8.q1, i8.q2, i42.f1, i43.f1, (42)
(25 rows)
select ss2.* from
int4_tbl i41
left join int8_tbl i8
join (select i42.f1 as c1, i43.f1 as c2, 42 as c3
from int4_tbl i42, int4_tbl i43) ss1
on i8.q1 = ss1.c2
on i41.f1 = ss1.c1,
lateral (select i41.*, i8.*, ss1.* from text_tbl limit 1) ss2
where ss1.c2 = 0;
f1 | q1 | q2 | c1 | c2 | c3
----+----+----+----+----+----
(0 rows)
--
-- test successful handling of full join underneath left join (bug #14105)
--
explain (costs off)
select * from
(select 1 as id) as xx
left join
(tenk1 as a1 full join (select 1 as id) as yy on (a1.unique1 = yy.id))
on (xx.id = coalesce(yy.id));
QUERY PLAN
---------------------------------------
Nested Loop Left Join
-> Result
-> Hash Full Join
Hash Cond: (a1.unique1 = (1))
Filter: (1 = COALESCE((1)))
-> Seq Scan on tenk1 a1
-> Hash
-> Result
(8 rows)
select * from
(select 1 as id) as xx
left join
(tenk1 as a1 full join (select 1 as id) as yy on (a1.unique1 = yy.id))
on (xx.id = coalesce(yy.id));
id | unique1 | unique2 | two | four | ten | twenty | hundred | thousand | twothousand | fivethous | tenthous | odd | even | stringu1 | stringu2 | string4 | id
----+---------+---------+-----+------+-----+--------+---------+----------+-------------+-----------+----------+-----+------+----------+----------+---------+----
1 | 1 | 2838 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 3 | BAAAAA | EFEAAA | OOOOxx | 1
(1 row)
--
-- test ability to push constants through outer join clauses
--
explain (costs off)
select * from int4_tbl a left join tenk1 b on f1 = unique2 where f1 = 0;
QUERY PLAN
-------------------------------------------------
Nested Loop Left Join
Join Filter: (a.f1 = b.unique2)
-> Seq Scan on int4_tbl a
Filter: (f1 = 0)
-> Index Scan using tenk1_unique2 on tenk1 b
Index Cond: (unique2 = 0)
(6 rows)
explain (costs off)
select * from tenk1 a full join tenk1 b using(unique2) where unique2 = 42;
QUERY PLAN
-------------------------------------------------
Merge Full Join
Merge Cond: (a.unique2 = b.unique2)
-> Index Scan using tenk1_unique2 on tenk1 a
Index Cond: (unique2 = 42)
-> Index Scan using tenk1_unique2 on tenk1 b
Index Cond: (unique2 = 42)
(6 rows)
--
-- test that quals attached to an outer join have correct semantics,
-- specifically that they don't re-use expressions computed below the join;
-- we force a mergejoin so that coalesce(b.q1, 1) appears as a join input
--
set enable_hashjoin to off;
set enable_nestloop to off;
explain (verbose, costs off)
select a.q2, b.q1
from int8_tbl a left join int8_tbl b on a.q2 = coalesce(b.q1, 1)
where coalesce(b.q1, 1) > 0;
QUERY PLAN
---------------------------------------------------------
Merge Left Join
Output: a.q2, b.q1
Merge Cond: (a.q2 = (COALESCE(b.q1, '1'::bigint)))
Filter: (COALESCE(b.q1, '1'::bigint) > 0)
-> Sort
Output: a.q2
Sort Key: a.q2
-> Seq Scan on public.int8_tbl a
Output: a.q2
-> Sort
Output: b.q1, (COALESCE(b.q1, '1'::bigint))
Sort Key: (COALESCE(b.q1, '1'::bigint))
-> Seq Scan on public.int8_tbl b
Output: b.q1, COALESCE(b.q1, '1'::bigint)
(14 rows)
select a.q2, b.q1
from int8_tbl a left join int8_tbl b on a.q2 = coalesce(b.q1, 1)
where coalesce(b.q1, 1) > 0;
q2 | q1
-------------------+------------------
-4567890123456789 |
123 | 123
123 | 123
456 |
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
(10 rows)
reset enable_hashjoin;
reset enable_nestloop;
--
-- test join removal
--
begin;
CREATE TEMP TABLE a (id int PRIMARY KEY, b_id int);
CREATE TEMP TABLE b (id int PRIMARY KEY, c_id int);
CREATE TEMP TABLE c (id int PRIMARY KEY);
CREATE TEMP TABLE d (a int, b int);
INSERT INTO a VALUES (0, 0), (1, NULL);
INSERT INTO b VALUES (0, 0), (1, NULL);
INSERT INTO c VALUES (0), (1);
INSERT INTO d VALUES (1,3), (2,2), (3,1);
-- all three cases should be optimizable into a simple seqscan
explain (costs off) SELECT a.* FROM a LEFT JOIN b ON a.b_id = b.id;
QUERY PLAN
---------------
Seq Scan on a
(1 row)
explain (costs off) SELECT b.* FROM b LEFT JOIN c ON b.c_id = c.id;
QUERY PLAN
---------------
Seq Scan on b
(1 row)
explain (costs off)
SELECT a.* FROM a LEFT JOIN (b left join c on b.c_id = c.id)
ON (a.b_id = b.id);
QUERY PLAN
---------------
Seq Scan on a
(1 row)
-- check optimization of outer join within another special join
explain (costs off)
select id from a where id in (
select b.id from b left join c on b.id = c.id
);
QUERY PLAN
----------------------------
Hash Join
Hash Cond: (a.id = b.id)
-> Seq Scan on a
-> Hash
-> Seq Scan on b
(5 rows)
-- check that join removal works for a left join when joining a subquery
-- that is guaranteed to be unique by its GROUP BY clause
explain (costs off)
select d.* from d left join (select * from b group by b.id, b.c_id) s
on d.a = s.id and d.b = s.c_id;
QUERY PLAN
---------------
Seq Scan on d
(1 row)
-- similarly, but keying off a DISTINCT clause
explain (costs off)
select d.* from d left join (select distinct * from b) s
on d.a = s.id and d.b = s.c_id;
QUERY PLAN
---------------
Seq Scan on d
(1 row)
-- join removal is not possible when the GROUP BY contains a column that is
-- not in the join condition. (Note: as of 9.6, we notice that b.id is a
-- primary key and so drop b.c_id from the GROUP BY of the resulting plan;
-- but this happens too late for join removal in the outer plan level.)
explain (costs off)
select d.* from d left join (select * from b group by b.id, b.c_id) s
on d.a = s.id;
QUERY PLAN
------------------------------------------
Merge Right Join
Merge Cond: (b.id = d.a)
-> Group
Group Key: b.id
-> Index Scan using b_pkey on b
-> Sort
Sort Key: d.a
-> Seq Scan on d
(8 rows)
-- similarly, but keying off a DISTINCT clause
explain (costs off)
select d.* from d left join (select distinct * from b) s
on d.a = s.id;
QUERY PLAN
--------------------------------------
Merge Right Join
Merge Cond: (b.id = d.a)
-> Unique
-> Sort
Sort Key: b.id, b.c_id
-> Seq Scan on b
-> Sort
Sort Key: d.a
-> Seq Scan on d
(9 rows)
-- check join removal works when uniqueness of the join condition is enforced
-- by a UNION
explain (costs off)
select d.* from d left join (select id from a union select id from b) s
on d.a = s.id;
QUERY PLAN
---------------
Seq Scan on d
(1 row)
-- check join removal with a cross-type comparison operator
explain (costs off)
select i8.* from int8_tbl i8 left join (select f1 from int4_tbl group by f1) i4
on i8.q1 = i4.f1;
QUERY PLAN
-------------------------
Seq Scan on int8_tbl i8
(1 row)
-- check join removal with lateral references
explain (costs off)
select 1 from (select a.id FROM a left join b on a.b_id = b.id) q,
lateral generate_series(1, q.id) gs(i) where q.id = gs.i;
QUERY PLAN
-------------------------------------------
Nested Loop
-> Seq Scan on a
-> Function Scan on generate_series gs
Filter: (a.id = i)
(4 rows)
rollback;
create temp table parent (k int primary key, pd int);
create temp table child (k int unique, cd int);
insert into parent values (1, 10), (2, 20), (3, 30);
insert into child values (1, 100), (4, 400);
-- this case is optimizable
select p.* from parent p left join child c on (p.k = c.k);
k | pd
---+----
1 | 10
2 | 20
3 | 30
(3 rows)
explain (costs off)
select p.* from parent p left join child c on (p.k = c.k);
QUERY PLAN
----------------------
Seq Scan on parent p
(1 row)
-- this case is not
select p.*, linked from parent p
left join (select c.*, true as linked from child c) as ss
on (p.k = ss.k);
k | pd | linked
---+----+--------
1 | 10 | t
2 | 20 |
3 | 30 |
(3 rows)
explain (costs off)
select p.*, linked from parent p
left join (select c.*, true as linked from child c) as ss
on (p.k = ss.k);
QUERY PLAN
---------------------------------
Hash Left Join
Hash Cond: (p.k = c.k)
-> Seq Scan on parent p
-> Hash
-> Seq Scan on child c
(5 rows)
-- check for a 9.0rc1 bug: join removal breaks pseudoconstant qual handling
select p.* from
parent p left join child c on (p.k = c.k)
where p.k = 1 and p.k = 2;
k | pd
---+----
(0 rows)
explain (costs off)
select p.* from
parent p left join child c on (p.k = c.k)
where p.k = 1 and p.k = 2;
QUERY PLAN
------------------------------------------------
Result
One-Time Filter: false
-> Index Scan using parent_pkey on parent p
Index Cond: (k = 1)
(4 rows)
select p.* from
(parent p left join child c on (p.k = c.k)) join parent x on p.k = x.k
where p.k = 1 and p.k = 2;
k | pd
---+----
(0 rows)
explain (costs off)
select p.* from
(parent p left join child c on (p.k = c.k)) join parent x on p.k = x.k
where p.k = 1 and p.k = 2;
QUERY PLAN
--------------------------
Result
One-Time Filter: false
(2 rows)
-- bug 5255: this is not optimizable by join removal
begin;
CREATE TEMP TABLE a (id int PRIMARY KEY);
CREATE TEMP TABLE b (id int PRIMARY KEY, a_id int);
INSERT INTO a VALUES (0), (1);
INSERT INTO b VALUES (0, 0), (1, NULL);
SELECT * FROM b LEFT JOIN a ON (b.a_id = a.id) WHERE (a.id IS NULL OR a.id > 0);
id | a_id | id
----+------+----
1 | |
(1 row)
SELECT b.* FROM b LEFT JOIN a ON (b.a_id = a.id) WHERE (a.id IS NULL OR a.id > 0);
id | a_id
----+------
1 |
(1 row)
rollback;
-- another join removal bug: this is not optimizable, either
begin;
create temp table innertab (id int8 primary key, dat1 int8);
insert into innertab values(123, 42);
SELECT * FROM
(SELECT 1 AS x) ss1
LEFT JOIN
(SELECT q1, q2, COALESCE(dat1, q1) AS y
FROM int8_tbl LEFT JOIN innertab ON q2 = id) ss2
ON true;
x | q1 | q2 | y
---+------------------+-------------------+------------------
1 | 123 | 456 | 123
1 | 123 | 4567890123456789 | 123
1 | 4567890123456789 | 123 | 42
1 | 4567890123456789 | 4567890123456789 | 4567890123456789
1 | 4567890123456789 | -4567890123456789 | 4567890123456789
(5 rows)
rollback;
-- another join removal bug: we must clean up correctly when removing a PHV
begin;
create temp table uniquetbl (f1 text unique);
explain (costs off)
select t1.* from
uniquetbl as t1
left join (select *, '***'::text as d1 from uniquetbl) t2
on t1.f1 = t2.f1
left join uniquetbl t3
on t2.d1 = t3.f1;
QUERY PLAN
--------------------------
Seq Scan on uniquetbl t1
(1 row)
explain (costs off)
select t0.*
from
text_tbl t0
left join
(select case t1.ten when 0 then 'doh!'::text else null::text end as case1,
t1.stringu2
from tenk1 t1
join int4_tbl i4 ON i4.f1 = t1.unique2
left join uniquetbl u1 ON u1.f1 = t1.string4) ss
on t0.f1 = ss.case1
where ss.stringu2 !~* ss.case1;
QUERY PLAN
--------------------------------------------------------------------------------------------
Nested Loop
Join Filter: (CASE t1.ten WHEN 0 THEN 'doh!'::text ELSE NULL::text END = t0.f1)
-> Nested Loop
-> Seq Scan on int4_tbl i4
-> Index Scan using tenk1_unique2 on tenk1 t1
Index Cond: (unique2 = i4.f1)
Filter: (stringu2 !~* CASE ten WHEN 0 THEN 'doh!'::text ELSE NULL::text END)
-> Materialize
-> Seq Scan on text_tbl t0
(9 rows)
select t0.*
from
text_tbl t0
left join
(select case t1.ten when 0 then 'doh!'::text else null::text end as case1,
t1.stringu2
from tenk1 t1
join int4_tbl i4 ON i4.f1 = t1.unique2
left join uniquetbl u1 ON u1.f1 = t1.string4) ss
on t0.f1 = ss.case1
where ss.stringu2 !~* ss.case1;
f1
------
doh!
(1 row)
rollback;
-- test case to expose miscomputation of required relid set for a PHV
explain (verbose, costs off)
select i8.*, ss.v, t.unique2
from int8_tbl i8
left join int4_tbl i4 on i4.f1 = 1
left join lateral (select i4.f1 + 1 as v) as ss on true
left join tenk1 t on t.unique2 = ss.v
where q2 = 456;
QUERY PLAN
-------------------------------------------------------------
Nested Loop Left Join
Output: i8.q1, i8.q2, ((i4.f1 + 1)), t.unique2
-> Nested Loop Left Join
Output: i8.q1, i8.q2, (i4.f1 + 1)
-> Seq Scan on public.int8_tbl i8
Output: i8.q1, i8.q2
Filter: (i8.q2 = 456)
-> Seq Scan on public.int4_tbl i4
Output: i4.f1
Filter: (i4.f1 = 1)
-> Index Only Scan using tenk1_unique2 on public.tenk1 t
Output: t.unique2
Index Cond: (t.unique2 = ((i4.f1 + 1)))
(13 rows)
select i8.*, ss.v, t.unique2
from int8_tbl i8
left join int4_tbl i4 on i4.f1 = 1
left join lateral (select i4.f1 + 1 as v) as ss on true
left join tenk1 t on t.unique2 = ss.v
where q2 = 456;
q1 | q2 | v | unique2
-----+-----+---+---------
123 | 456 | |
(1 row)
-- and check a related issue where we miscompute required relids for
-- a PHV that's been translated to a child rel
create temp table parttbl (a integer primary key) partition by range (a);
create temp table parttbl1 partition of parttbl for values from (1) to (100);
insert into parttbl values (11), (12);
explain (costs off)
select * from
(select *, 12 as phv from parttbl) as ss
right join int4_tbl on true
where ss.a = ss.phv and f1 = 0;
QUERY PLAN
------------------------------------
Nested Loop
-> Seq Scan on int4_tbl
Filter: (f1 = 0)
-> Seq Scan on parttbl1 parttbl
Filter: (a = 12)
(5 rows)
select * from
(select *, 12 as phv from parttbl) as ss
right join int4_tbl on true
where ss.a = ss.phv and f1 = 0;
a | phv | f1
----+-----+----
12 | 12 | 0
(1 row)
-- bug #8444: we've historically allowed duplicate aliases within aliased JOINs
select * from
int8_tbl x join (int4_tbl x cross join int4_tbl y) j on q1 = f1; -- error
ERROR: column reference "f1" is ambiguous
LINE 2: ..._tbl x join (int4_tbl x cross join int4_tbl y) j on q1 = f1;
^
select * from
int8_tbl x join (int4_tbl x cross join int4_tbl y) j on q1 = y.f1; -- error
ERROR: invalid reference to FROM-clause entry for table "y"
LINE 2: ...bl x join (int4_tbl x cross join int4_tbl y) j on q1 = y.f1;
^
HINT: There is an entry for table "y", but it cannot be referenced from this part of the query.
select * from
int8_tbl x join (int4_tbl x cross join int4_tbl y(ff)) j on q1 = f1; -- ok
q1 | q2 | f1 | ff
----+----+----+----
(0 rows)
--
-- Test hints given on incorrect column references are useful
--
select t1.uunique1 from
tenk1 t1 join tenk2 t2 on t1.two = t2.two; -- error, prefer "t1" suggestion
ERROR: column t1.uunique1 does not exist
LINE 1: select t1.uunique1 from
^
HINT: Perhaps you meant to reference the column "t1.unique1".
select t2.uunique1 from
tenk1 t1 join tenk2 t2 on t1.two = t2.two; -- error, prefer "t2" suggestion
ERROR: column t2.uunique1 does not exist
LINE 1: select t2.uunique1 from
^
HINT: Perhaps you meant to reference the column "t2.unique1".
select uunique1 from
tenk1 t1 join tenk2 t2 on t1.two = t2.two; -- error, suggest both at once
ERROR: column "uunique1" does not exist
LINE 1: select uunique1 from
^
HINT: Perhaps you meant to reference the column "t1.unique1" or the column "t2.unique1".
--
-- Take care to reference the correct RTE
--
select atts.relid::regclass, s.* from pg_stats s join
pg_attribute a on s.attname = a.attname and s.tablename =
a.attrelid::regclass::text join (select unnest(indkey) attnum,
indexrelid from pg_index i) atts on atts.attnum = a.attnum where
schemaname != 'pg_catalog';
ERROR: column atts.relid does not exist
LINE 1: select atts.relid::regclass, s.* from pg_stats s join
^
--
-- Test LATERAL
--
select unique2, x.*
from tenk1 a, lateral (select * from int4_tbl b where f1 = a.unique1) x;
unique2 | f1
---------+----
9998 | 0
(1 row)
explain (costs off)
select unique2, x.*
from tenk1 a, lateral (select * from int4_tbl b where f1 = a.unique1) x;
QUERY PLAN
-------------------------------------------------
Nested Loop
-> Seq Scan on int4_tbl b
-> Index Scan using tenk1_unique1 on tenk1 a
Index Cond: (unique1 = b.f1)
(4 rows)
select unique2, x.*
from int4_tbl x, lateral (select unique2 from tenk1 where f1 = unique1) ss;
unique2 | f1
---------+----
9998 | 0
(1 row)
explain (costs off)
select unique2, x.*
from int4_tbl x, lateral (select unique2 from tenk1 where f1 = unique1) ss;
QUERY PLAN
-----------------------------------------------
Nested Loop
-> Seq Scan on int4_tbl x
-> Index Scan using tenk1_unique1 on tenk1
Index Cond: (unique1 = x.f1)
(4 rows)
explain (costs off)
select unique2, x.*
from int4_tbl x cross join lateral (select unique2 from tenk1 where f1 = unique1) ss;
QUERY PLAN
-----------------------------------------------
Nested Loop
-> Seq Scan on int4_tbl x
-> Index Scan using tenk1_unique1 on tenk1
Index Cond: (unique1 = x.f1)
(4 rows)
select unique2, x.*
from int4_tbl x left join lateral (select unique1, unique2 from tenk1 where f1 = unique1) ss on true;
unique2 | f1
---------+-------------
9998 | 0
| 123456
| -123456
| 2147483647
| -2147483647
(5 rows)
explain (costs off)
select unique2, x.*
from int4_tbl x left join lateral (select unique1, unique2 from tenk1 where f1 = unique1) ss on true;
QUERY PLAN
-----------------------------------------------
Nested Loop Left Join
-> Seq Scan on int4_tbl x
-> Index Scan using tenk1_unique1 on tenk1
Index Cond: (unique1 = x.f1)
(4 rows)
-- check scoping of lateral versus parent references
-- the first of these should return int8_tbl.q2, the second int8_tbl.q1
select *, (select r from (select q1 as q2) x, (select q2 as r) y) from int8_tbl;
q1 | q2 | r
------------------+-------------------+-------------------
123 | 456 | 456
123 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 123
4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | -4567890123456789
(5 rows)
select *, (select r from (select q1 as q2) x, lateral (select q2 as r) y) from int8_tbl;
q1 | q2 | r
------------------+-------------------+------------------
123 | 456 | 123
123 | 4567890123456789 | 123
4567890123456789 | 123 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | 4567890123456789
(5 rows)
-- lateral with function in FROM
select count(*) from tenk1 a, lateral generate_series(1,two) g;
count
-------
5000
(1 row)
explain (costs off)
select count(*) from tenk1 a, lateral generate_series(1,two) g;
QUERY PLAN
------------------------------------------------------
Aggregate
-> Nested Loop
-> Seq Scan on tenk1 a
-> Memoize
Cache Key: a.two
Cache Mode: binary
-> Function Scan on generate_series g
(7 rows)
explain (costs off)
select count(*) from tenk1 a cross join lateral generate_series(1,two) g;
QUERY PLAN
------------------------------------------------------
Aggregate
-> Nested Loop
-> Seq Scan on tenk1 a
-> Memoize
Cache Key: a.two
Cache Mode: binary
-> Function Scan on generate_series g
(7 rows)
-- don't need the explicit LATERAL keyword for functions
explain (costs off)
select count(*) from tenk1 a, generate_series(1,two) g;
QUERY PLAN
------------------------------------------------------
Aggregate
-> Nested Loop
-> Seq Scan on tenk1 a
-> Memoize
Cache Key: a.two
Cache Mode: binary
-> Function Scan on generate_series g
(7 rows)
-- lateral with UNION ALL subselect
explain (costs off)
select * from generate_series(100,200) g,
lateral (select * from int8_tbl a where g = q1 union all
select * from int8_tbl b where g = q2) ss;
QUERY PLAN
------------------------------------------
Nested Loop
-> Function Scan on generate_series g
-> Append
-> Seq Scan on int8_tbl a
Filter: (g.g = q1)
-> Seq Scan on int8_tbl b
Filter: (g.g = q2)
(7 rows)
select * from generate_series(100,200) g,
lateral (select * from int8_tbl a where g = q1 union all
select * from int8_tbl b where g = q2) ss;
g | q1 | q2
-----+------------------+------------------
123 | 123 | 456
123 | 123 | 4567890123456789
123 | 4567890123456789 | 123
(3 rows)
-- lateral with VALUES
explain (costs off)
select count(*) from tenk1 a,
tenk1 b join lateral (values(a.unique1)) ss(x) on b.unique2 = ss.x;
QUERY PLAN
------------------------------------------------------------
Aggregate
-> Merge Join
Merge Cond: (a.unique1 = b.unique2)
-> Index Only Scan using tenk1_unique1 on tenk1 a
-> Index Only Scan using tenk1_unique2 on tenk1 b
(5 rows)
select count(*) from tenk1 a,
tenk1 b join lateral (values(a.unique1)) ss(x) on b.unique2 = ss.x;
count
-------
10000
(1 row)
-- lateral with VALUES, no flattening possible
explain (costs off)
select count(*) from tenk1 a,
tenk1 b join lateral (values(a.unique1),(-1)) ss(x) on b.unique2 = ss.x;
QUERY PLAN
------------------------------------------------------------------
Aggregate
-> Nested Loop
-> Nested Loop
-> Index Only Scan using tenk1_unique1 on tenk1 a
-> Values Scan on "*VALUES*"
-> Memoize
Cache Key: "*VALUES*".column1
Cache Mode: logical
-> Index Only Scan using tenk1_unique2 on tenk1 b
Index Cond: (unique2 = "*VALUES*".column1)
(10 rows)
select count(*) from tenk1 a,
tenk1 b join lateral (values(a.unique1),(-1)) ss(x) on b.unique2 = ss.x;
count
-------
10000
(1 row)
-- lateral injecting a strange outer join condition
explain (costs off)
select * from int8_tbl a,
int8_tbl x left join lateral (select a.q1 from int4_tbl y) ss(z)
on x.q2 = ss.z
order by a.q1, a.q2, x.q1, x.q2, ss.z;
QUERY PLAN
------------------------------------------------
Sort
Sort Key: a.q1, a.q2, x.q1, x.q2, (a.q1)
-> Nested Loop
-> Seq Scan on int8_tbl a
-> Hash Right Join
Hash Cond: ((a.q1) = x.q2)
-> Seq Scan on int4_tbl y
-> Hash
-> Seq Scan on int8_tbl x
(9 rows)
select * from int8_tbl a,
int8_tbl x left join lateral (select a.q1 from int4_tbl y) ss(z)
on x.q2 = ss.z
order by a.q1, a.q2, x.q1, x.q2, ss.z;
q1 | q2 | q1 | q2 | z
------------------+-------------------+------------------+-------------------+------------------
123 | 456 | 123 | 456 |
123 | 456 | 123 | 4567890123456789 |
123 | 456 | 4567890123456789 | -4567890123456789 |
123 | 456 | 4567890123456789 | 123 | 123
123 | 456 | 4567890123456789 | 123 | 123
123 | 456 | 4567890123456789 | 123 | 123
123 | 456 | 4567890123456789 | 123 | 123
123 | 456 | 4567890123456789 | 123 | 123
123 | 456 | 4567890123456789 | 4567890123456789 |
123 | 4567890123456789 | 123 | 456 |
123 | 4567890123456789 | 123 | 4567890123456789 |
123 | 4567890123456789 | 4567890123456789 | -4567890123456789 |
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 |
4567890123456789 | -4567890123456789 | 123 | 456 |
4567890123456789 | -4567890123456789 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | 4567890123456789 | -4567890123456789 |
4567890123456789 | -4567890123456789 | 4567890123456789 | 123 |
4567890123456789 | -4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 123 | 456 |
4567890123456789 | 123 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 4567890123456789 | -4567890123456789 |
4567890123456789 | 123 | 4567890123456789 | 123 |
4567890123456789 | 123 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 123 | 456 |
4567890123456789 | 4567890123456789 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 123 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | -4567890123456789 |
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 |
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
(57 rows)
-- lateral reference to a join alias variable
select * from (select f1/2 as x from int4_tbl) ss1 join int4_tbl i4 on x = f1,
lateral (select x) ss2(y);
x | f1 | y
---+----+---
0 | 0 | 0
(1 row)
select * from (select f1 as x from int4_tbl) ss1 join int4_tbl i4 on x = f1,
lateral (values(x)) ss2(y);
x | f1 | y
-------------+-------------+-------------
0 | 0 | 0
123456 | 123456 | 123456
-123456 | -123456 | -123456
2147483647 | 2147483647 | 2147483647
-2147483647 | -2147483647 | -2147483647
(5 rows)
select * from ((select f1/2 as x from int4_tbl) ss1 join int4_tbl i4 on x = f1) j,
lateral (select x) ss2(y);
x | f1 | y
---+----+---
0 | 0 | 0
(1 row)
-- lateral references requiring pullup
select * from (values(1)) x(lb),
lateral generate_series(lb,4) x4;
lb | x4
----+----
1 | 1
1 | 2
1 | 3
1 | 4
(4 rows)
select * from (select f1/1000000000 from int4_tbl) x(lb),
lateral generate_series(lb,4) x4;
lb | x4
----+----
0 | 0
0 | 1
0 | 2
0 | 3
0 | 4
0 | 0
0 | 1
0 | 2
0 | 3
0 | 4
0 | 0
0 | 1
0 | 2
0 | 3
0 | 4
2 | 2
2 | 3
2 | 4
-2 | -2
-2 | -1
-2 | 0
-2 | 1
-2 | 2
-2 | 3
-2 | 4
(25 rows)
select * from (values(1)) x(lb),
lateral (values(lb)) y(lbcopy);
lb | lbcopy
----+--------
1 | 1
(1 row)
select * from (values(1)) x(lb),
lateral (select lb from int4_tbl) y(lbcopy);
lb | lbcopy
----+--------
1 | 1
1 | 1
1 | 1
1 | 1
1 | 1
(5 rows)
select * from
int8_tbl x left join (select q1,coalesce(q2,0) q2 from int8_tbl) y on x.q2 = y.q1,
lateral (values(x.q1,y.q1,y.q2)) v(xq1,yq1,yq2);
q1 | q2 | q1 | q2 | xq1 | yq1 | yq2
------------------+-------------------+------------------+-------------------+------------------+------------------+-------------------
123 | 456 | | | 123 | |
123 | 4567890123456789 | 4567890123456789 | -4567890123456789 | 123 | 4567890123456789 | -4567890123456789
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 4567890123456789 | 4567890123456789
123 | 4567890123456789 | 4567890123456789 | 123 | 123 | 4567890123456789 | 123
4567890123456789 | 123 | 123 | 4567890123456789 | 4567890123456789 | 123 | 4567890123456789
4567890123456789 | 123 | 123 | 456 | 4567890123456789 | 123 | 456
4567890123456789 | 4567890123456789 | 4567890123456789 | -4567890123456789 | 4567890123456789 | 4567890123456789 | -4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 4567890123456789 | 4567890123456789 | 123
4567890123456789 | -4567890123456789 | | | 4567890123456789 | |
(10 rows)
select * from
int8_tbl x left join (select q1,coalesce(q2,0) q2 from int8_tbl) y on x.q2 = y.q1,
lateral (select x.q1,y.q1,y.q2) v(xq1,yq1,yq2);
q1 | q2 | q1 | q2 | xq1 | yq1 | yq2
------------------+-------------------+------------------+-------------------+------------------+------------------+-------------------
123 | 456 | | | 123 | |
123 | 4567890123456789 | 4567890123456789 | -4567890123456789 | 123 | 4567890123456789 | -4567890123456789
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 4567890123456789 | 4567890123456789
123 | 4567890123456789 | 4567890123456789 | 123 | 123 | 4567890123456789 | 123
4567890123456789 | 123 | 123 | 4567890123456789 | 4567890123456789 | 123 | 4567890123456789
4567890123456789 | 123 | 123 | 456 | 4567890123456789 | 123 | 456
4567890123456789 | 4567890123456789 | 4567890123456789 | -4567890123456789 | 4567890123456789 | 4567890123456789 | -4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 4567890123456789 | 4567890123456789 | 123
4567890123456789 | -4567890123456789 | | | 4567890123456789 | |
(10 rows)
select x.* from
int8_tbl x left join (select q1,coalesce(q2,0) q2 from int8_tbl) y on x.q2 = y.q1,
lateral (select x.q1,y.q1,y.q2) v(xq1,yq1,yq2);
q1 | q2
------------------+-------------------
123 | 456
123 | 4567890123456789
123 | 4567890123456789
123 | 4567890123456789
4567890123456789 | 123
4567890123456789 | 123
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789
(10 rows)
select v.* from
(int8_tbl x left join (select q1,coalesce(q2,0) q2 from int8_tbl) y on x.q2 = y.q1)
left join int4_tbl z on z.f1 = x.q2,
lateral (select x.q1,y.q1 union all select x.q2,y.q2) v(vx,vy);
vx | vy
-------------------+-------------------
123 |
456 |
123 | 4567890123456789
4567890123456789 | -4567890123456789
123 | 4567890123456789
4567890123456789 | 4567890123456789
123 | 4567890123456789
4567890123456789 | 123
4567890123456789 | 123
123 | 4567890123456789
4567890123456789 | 123
123 | 456
4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 123
4567890123456789 |
-4567890123456789 |
(20 rows)
select v.* from
(int8_tbl x left join (select q1,(select coalesce(q2,0)) q2 from int8_tbl) y on x.q2 = y.q1)
left join int4_tbl z on z.f1 = x.q2,
lateral (select x.q1,y.q1 union all select x.q2,y.q2) v(vx,vy);
vx | vy
-------------------+-------------------
4567890123456789 | 123
123 | 456
4567890123456789 | 123
123 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 123
123 | 4567890123456789
4567890123456789 | 123
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
123 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789
123 | 4567890123456789
4567890123456789 | -4567890123456789
123 |
456 |
4567890123456789 |
-4567890123456789 |
(20 rows)
select v.* from
(int8_tbl x left join (select q1,(select coalesce(q2,0)) q2 from int8_tbl) y on x.q2 = y.q1)
left join int4_tbl z on z.f1 = x.q2,
lateral (select x.q1,y.q1 from onerow union all select x.q2,y.q2 from onerow) v(vx,vy);
vx | vy
-------------------+-------------------
4567890123456789 | 123
123 | 456
4567890123456789 | 123
123 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 123
123 | 4567890123456789
4567890123456789 | 123
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
123 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789
123 | 4567890123456789
4567890123456789 | -4567890123456789
123 |
456 |
4567890123456789 |
-4567890123456789 |
(20 rows)
explain (verbose, costs off)
select * from
int8_tbl a left join
lateral (select *, a.q2 as x from int8_tbl b) ss on a.q2 = ss.q1;
QUERY PLAN
------------------------------------------
Nested Loop Left Join
Output: a.q1, a.q2, b.q1, b.q2, (a.q2)
-> Seq Scan on public.int8_tbl a
Output: a.q1, a.q2
-> Seq Scan on public.int8_tbl b
Output: b.q1, b.q2, a.q2
Filter: (a.q2 = b.q1)
(7 rows)
select * from
int8_tbl a left join
lateral (select *, a.q2 as x from int8_tbl b) ss on a.q2 = ss.q1;
q1 | q2 | q1 | q2 | x
------------------+-------------------+------------------+-------------------+------------------
123 | 456 | | |
123 | 4567890123456789 | 4567890123456789 | 123 | 4567890123456789
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
123 | 4567890123456789 | 4567890123456789 | -4567890123456789 | 4567890123456789
4567890123456789 | 123 | 123 | 456 | 123
4567890123456789 | 123 | 123 | 4567890123456789 | 123
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | -4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | | |
(10 rows)
explain (verbose, costs off)
select * from
int8_tbl a left join
lateral (select *, coalesce(a.q2, 42) as x from int8_tbl b) ss on a.q2 = ss.q1;
QUERY PLAN
------------------------------------------------------------------
Nested Loop Left Join
Output: a.q1, a.q2, b.q1, b.q2, (COALESCE(a.q2, '42'::bigint))
-> Seq Scan on public.int8_tbl a
Output: a.q1, a.q2
-> Seq Scan on public.int8_tbl b
Output: b.q1, b.q2, COALESCE(a.q2, '42'::bigint)
Filter: (a.q2 = b.q1)
(7 rows)
select * from
int8_tbl a left join
lateral (select *, coalesce(a.q2, 42) as x from int8_tbl b) ss on a.q2 = ss.q1;
q1 | q2 | q1 | q2 | x
------------------+-------------------+------------------+-------------------+------------------
123 | 456 | | |
123 | 4567890123456789 | 4567890123456789 | 123 | 4567890123456789
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
123 | 4567890123456789 | 4567890123456789 | -4567890123456789 | 4567890123456789
4567890123456789 | 123 | 123 | 456 | 123
4567890123456789 | 123 | 123 | 4567890123456789 | 123
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | -4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | | |
(10 rows)
-- lateral can result in join conditions appearing below their
-- real semantic level
explain (verbose, costs off)
select * from int4_tbl i left join
lateral (select * from int2_tbl j where i.f1 = j.f1) k on true;
QUERY PLAN
-------------------------------------------
Hash Left Join
Output: i.f1, j.f1
Hash Cond: (i.f1 = j.f1)
-> Seq Scan on public.int4_tbl i
Output: i.f1
-> Hash
Output: j.f1
-> Seq Scan on public.int2_tbl j
Output: j.f1
(9 rows)
select * from int4_tbl i left join
lateral (select * from int2_tbl j where i.f1 = j.f1) k on true;
f1 | f1
-------------+----
0 | 0
123456 |
-123456 |
2147483647 |
-2147483647 |
(5 rows)
explain (verbose, costs off)
select * from int4_tbl i left join
lateral (select coalesce(i) from int2_tbl j where i.f1 = j.f1) k on true;
QUERY PLAN
-------------------------------------
Nested Loop Left Join
Output: i.f1, (COALESCE(i.*))
-> Seq Scan on public.int4_tbl i
Output: i.f1, i.*
-> Seq Scan on public.int2_tbl j
Output: j.f1, COALESCE(i.*)
Filter: (i.f1 = j.f1)
(7 rows)
select * from int4_tbl i left join
lateral (select coalesce(i) from int2_tbl j where i.f1 = j.f1) k on true;
f1 | coalesce
-------------+----------
0 | (0)
123456 |
-123456 |
2147483647 |
-2147483647 |
(5 rows)
explain (verbose, costs off)
select * from int4_tbl a,
lateral (
select * from int4_tbl b left join int8_tbl c on (b.f1 = q1 and a.f1 = q2)
) ss;
QUERY PLAN
-------------------------------------------------
Nested Loop
Output: a.f1, b.f1, c.q1, c.q2
-> Seq Scan on public.int4_tbl a
Output: a.f1
-> Hash Left Join
Output: b.f1, c.q1, c.q2
Hash Cond: (b.f1 = c.q1)
-> Seq Scan on public.int4_tbl b
Output: b.f1
-> Hash
Output: c.q1, c.q2
-> Seq Scan on public.int8_tbl c
Output: c.q1, c.q2
Filter: (a.f1 = c.q2)
(14 rows)
select * from int4_tbl a,
lateral (
select * from int4_tbl b left join int8_tbl c on (b.f1 = q1 and a.f1 = q2)
) ss;
f1 | f1 | q1 | q2
-------------+-------------+----+----
0 | 0 | |
0 | 123456 | |
0 | -123456 | |
0 | 2147483647 | |
0 | -2147483647 | |
123456 | 0 | |
123456 | 123456 | |
123456 | -123456 | |
123456 | 2147483647 | |
123456 | -2147483647 | |
-123456 | 0 | |
-123456 | 123456 | |
-123456 | -123456 | |
-123456 | 2147483647 | |
-123456 | -2147483647 | |
2147483647 | 0 | |
2147483647 | 123456 | |
2147483647 | -123456 | |
2147483647 | 2147483647 | |
2147483647 | -2147483647 | |
-2147483647 | 0 | |
-2147483647 | 123456 | |
-2147483647 | -123456 | |
-2147483647 | 2147483647 | |
-2147483647 | -2147483647 | |
(25 rows)
-- lateral reference in a PlaceHolderVar evaluated at join level
explain (verbose, costs off)
select * from
int8_tbl a left join lateral
(select b.q1 as bq1, c.q1 as cq1, least(a.q1,b.q1,c.q1) from
int8_tbl b cross join int8_tbl c) ss
on a.q2 = ss.bq1;
QUERY PLAN
-------------------------------------------------------------
Nested Loop Left Join
Output: a.q1, a.q2, b.q1, c.q1, (LEAST(a.q1, b.q1, c.q1))
-> Seq Scan on public.int8_tbl a
Output: a.q1, a.q2
-> Nested Loop
Output: b.q1, c.q1, LEAST(a.q1, b.q1, c.q1)
-> Seq Scan on public.int8_tbl b
Output: b.q1, b.q2
Filter: (a.q2 = b.q1)
-> Seq Scan on public.int8_tbl c
Output: c.q1, c.q2
(11 rows)
select * from
int8_tbl a left join lateral
(select b.q1 as bq1, c.q1 as cq1, least(a.q1,b.q1,c.q1) from
int8_tbl b cross join int8_tbl c) ss
on a.q2 = ss.bq1;
q1 | q2 | bq1 | cq1 | least
------------------+-------------------+------------------+------------------+------------------
123 | 456 | | |
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 123 | 123
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123
123 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 123
4567890123456789 | 123 | 123 | 123 | 123
4567890123456789 | 123 | 123 | 123 | 123
4567890123456789 | 123 | 123 | 4567890123456789 | 123
4567890123456789 | 123 | 123 | 4567890123456789 | 123
4567890123456789 | 123 | 123 | 4567890123456789 | 123
4567890123456789 | 123 | 123 | 123 | 123
4567890123456789 | 123 | 123 | 123 | 123
4567890123456789 | 123 | 123 | 4567890123456789 | 123
4567890123456789 | 123 | 123 | 4567890123456789 | 123
4567890123456789 | 123 | 123 | 4567890123456789 | 123
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 123
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 123
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 123
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 123
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 123
4567890123456789 | 4567890123456789 | 4567890123456789 | 123 | 123
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | | |
(42 rows)
-- case requiring nested PlaceHolderVars
explain (verbose, costs off)
select * from
int8_tbl c left join (
int8_tbl a left join (select q1, coalesce(q2,42) as x from int8_tbl b) ss1
on a.q2 = ss1.q1
cross join
lateral (select q1, coalesce(ss1.x,q2) as y from int8_tbl d) ss2
) on c.q2 = ss2.q1,
lateral (select ss2.y offset 0) ss3;
QUERY PLAN
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Nested Loop
Output: c.q1, c.q2, a.q1, a.q2, b.q1, (COALESCE(b.q2, '42'::bigint)), d.q1, (COALESCE((COALESCE(b.q2, '42'::bigint)), d.q2)), ((COALESCE((COALESCE(b.q2, '42'::bigint)), d.q2)))
-> Hash Right Join
Output: c.q1, c.q2, a.q1, a.q2, b.q1, d.q1, (COALESCE(b.q2, '42'::bigint)), (COALESCE((COALESCE(b.q2, '42'::bigint)), d.q2))
Hash Cond: (d.q1 = c.q2)
-> Nested Loop
Output: a.q1, a.q2, b.q1, d.q1, (COALESCE(b.q2, '42'::bigint)), (COALESCE((COALESCE(b.q2, '42'::bigint)), d.q2))
-> Hash Left Join
Output: a.q1, a.q2, b.q1, (COALESCE(b.q2, '42'::bigint))
Hash Cond: (a.q2 = b.q1)
-> Seq Scan on public.int8_tbl a
Output: a.q1, a.q2
-> Hash
Output: b.q1, (COALESCE(b.q2, '42'::bigint))
-> Seq Scan on public.int8_tbl b
Output: b.q1, COALESCE(b.q2, '42'::bigint)
-> Seq Scan on public.int8_tbl d
Output: d.q1, COALESCE((COALESCE(b.q2, '42'::bigint)), d.q2)
-> Hash
Output: c.q1, c.q2
-> Seq Scan on public.int8_tbl c
Output: c.q1, c.q2
-> Result
Output: (COALESCE((COALESCE(b.q2, '42'::bigint)), d.q2))
(24 rows)
-- case that breaks the old ph_may_need optimization
explain (verbose, costs off)
select c.*,a.*,ss1.q1,ss2.q1,ss3.* from
int8_tbl c left join (
int8_tbl a left join
(select q1, coalesce(q2,f1) as x from int8_tbl b, int4_tbl b2
where q1 < f1) ss1
on a.q2 = ss1.q1
cross join
lateral (select q1, coalesce(ss1.x,q2) as y from int8_tbl d) ss2
) on c.q2 = ss2.q1,
lateral (select * from int4_tbl i where ss2.y > f1) ss3;
QUERY PLAN
---------------------------------------------------------------------------------------------------------
Nested Loop
Output: c.q1, c.q2, a.q1, a.q2, b.q1, d.q1, i.f1
Join Filter: ((COALESCE((COALESCE(b.q2, (b2.f1)::bigint)), d.q2)) > i.f1)
-> Hash Right Join
Output: c.q1, c.q2, a.q1, a.q2, b.q1, d.q1, (COALESCE((COALESCE(b.q2, (b2.f1)::bigint)), d.q2))
Hash Cond: (d.q1 = c.q2)
-> Nested Loop
Output: a.q1, a.q2, b.q1, d.q1, (COALESCE((COALESCE(b.q2, (b2.f1)::bigint)), d.q2))
-> Hash Right Join
Output: a.q1, a.q2, b.q1, (COALESCE(b.q2, (b2.f1)::bigint))
Hash Cond: (b.q1 = a.q2)
-> Nested Loop
Output: b.q1, COALESCE(b.q2, (b2.f1)::bigint)
Join Filter: (b.q1 < b2.f1)
-> Seq Scan on public.int8_tbl b
Output: b.q1, b.q2
-> Materialize
Output: b2.f1
-> Seq Scan on public.int4_tbl b2
Output: b2.f1
-> Hash
Output: a.q1, a.q2
-> Seq Scan on public.int8_tbl a
Output: a.q1, a.q2
-> Seq Scan on public.int8_tbl d
Output: d.q1, COALESCE((COALESCE(b.q2, (b2.f1)::bigint)), d.q2)
-> Hash
Output: c.q1, c.q2
-> Seq Scan on public.int8_tbl c
Output: c.q1, c.q2
-> Materialize
Output: i.f1
-> Seq Scan on public.int4_tbl i
Output: i.f1
(34 rows)
-- check processing of postponed quals (bug #9041)
explain (verbose, costs off)
select * from
(select 1 as x offset 0) x cross join (select 2 as y offset 0) y
left join lateral (
select * from (select 3 as z offset 0) z where z.z = x.x
) zz on zz.z = y.y;
QUERY PLAN
----------------------------------------------
Nested Loop Left Join
Output: (1), (2), (3)
Join Filter: (((3) = (1)) AND ((3) = (2)))
-> Nested Loop
Output: (1), (2)
-> Result
Output: 1
-> Result
Output: 2
-> Result
Output: 3
(11 rows)
-- check dummy rels with lateral references (bug #15694)
explain (verbose, costs off)
select * from int8_tbl i8 left join lateral
(select *, i8.q2 from int4_tbl where false) ss on true;
QUERY PLAN
--------------------------------------
Nested Loop Left Join
Output: i8.q1, i8.q2, f1, (i8.q2)
-> Seq Scan on public.int8_tbl i8
Output: i8.q1, i8.q2
-> Result
Output: f1, i8.q2
One-Time Filter: false
(7 rows)
explain (verbose, costs off)
select * from int8_tbl i8 left join lateral
(select *, i8.q2 from int4_tbl i1, int4_tbl i2 where false) ss on true;
QUERY PLAN
-----------------------------------------
Nested Loop Left Join
Output: i8.q1, i8.q2, f1, f1, (i8.q2)
-> Seq Scan on public.int8_tbl i8
Output: i8.q1, i8.q2
-> Result
Output: f1, f1, i8.q2
One-Time Filter: false
(7 rows)
-- check handling of nested appendrels inside LATERAL
select * from
((select 2 as v) union all (select 3 as v)) as q1
cross join lateral
((select * from
((select 4 as v) union all (select 5 as v)) as q3)
union all
(select q1.v)
) as q2;
v | v
---+---
2 | 4
2 | 5
2 | 2
3 | 4
3 | 5
3 | 3
(6 rows)
-- check we don't try to do a unique-ified semijoin with LATERAL
explain (verbose, costs off)
select * from
(values (0,9998), (1,1000)) v(id,x),
lateral (select f1 from int4_tbl
where f1 = any (select unique1 from tenk1
where unique2 = v.x offset 0)) ss;
QUERY PLAN
----------------------------------------------------------------------
Nested Loop
Output: "*VALUES*".column1, "*VALUES*".column2, int4_tbl.f1
-> Values Scan on "*VALUES*"
Output: "*VALUES*".column1, "*VALUES*".column2
-> Nested Loop Semi Join
Output: int4_tbl.f1
Join Filter: (int4_tbl.f1 = tenk1.unique1)
-> Seq Scan on public.int4_tbl
Output: int4_tbl.f1
-> Materialize
Output: tenk1.unique1
-> Index Scan using tenk1_unique2 on public.tenk1
Output: tenk1.unique1
Index Cond: (tenk1.unique2 = "*VALUES*".column2)
(14 rows)
select * from
(values (0,9998), (1,1000)) v(id,x),
lateral (select f1 from int4_tbl
where f1 = any (select unique1 from tenk1
where unique2 = v.x offset 0)) ss;
id | x | f1
----+------+----
0 | 9998 | 0
(1 row)
-- check proper extParam/allParam handling (this isn't exactly a LATERAL issue,
-- but we can make the test case much more compact with LATERAL)
explain (verbose, costs off)
select * from (values (0), (1)) v(id),
lateral (select * from int8_tbl t1,
lateral (select * from
(select * from int8_tbl t2
where q1 = any (select q2 from int8_tbl t3
where q2 = (select greatest(t1.q1,t2.q2))
and (select v.id=0)) offset 0) ss2) ss
where t1.q1 = ss.q2) ss0;
QUERY PLAN
-----------------------------------------------------------------
Nested Loop
Output: "*VALUES*".column1, t1.q1, t1.q2, ss2.q1, ss2.q2
-> Seq Scan on public.int8_tbl t1
Output: t1.q1, t1.q2
-> Nested Loop
Output: "*VALUES*".column1, ss2.q1, ss2.q2
-> Values Scan on "*VALUES*"
Output: "*VALUES*".column1
-> Subquery Scan on ss2
Output: ss2.q1, ss2.q2
Filter: (t1.q1 = ss2.q2)
-> Seq Scan on public.int8_tbl t2
Output: t2.q1, t2.q2
Filter: (SubPlan 3)
SubPlan 3
-> Result
Output: t3.q2
One-Time Filter: $4
InitPlan 1 (returns $2)
-> Result
Output: GREATEST($0, t2.q2)
InitPlan 2 (returns $4)
-> Result
Output: ($3 = 0)
-> Seq Scan on public.int8_tbl t3
Output: t3.q1, t3.q2
Filter: (t3.q2 = $2)
(27 rows)
select * from (values (0), (1)) v(id),
lateral (select * from int8_tbl t1,
lateral (select * from
(select * from int8_tbl t2
where q1 = any (select q2 from int8_tbl t3
where q2 = (select greatest(t1.q1,t2.q2))
and (select v.id=0)) offset 0) ss2) ss
where t1.q1 = ss.q2) ss0;
id | q1 | q2 | q1 | q2
----+------------------+-------------------+------------------+------------------
0 | 4567890123456789 | 123 | 4567890123456789 | 4567890123456789
0 | 4567890123456789 | 4567890123456789 | 4567890123456789 | 4567890123456789
0 | 4567890123456789 | -4567890123456789 | 4567890123456789 | 4567890123456789
(3 rows)
-- test some error cases where LATERAL should have been used but wasn't
select f1,g from int4_tbl a, (select f1 as g) ss;
ERROR: column "f1" does not exist
LINE 1: select f1,g from int4_tbl a, (select f1 as g) ss;
^
HINT: There is a column named "f1" in table "a", but it cannot be referenced from this part of the query.
select f1,g from int4_tbl a, (select a.f1 as g) ss;
ERROR: invalid reference to FROM-clause entry for table "a"
LINE 1: select f1,g from int4_tbl a, (select a.f1 as g) ss;
^
HINT: There is an entry for table "a", but it cannot be referenced from this part of the query.
select f1,g from int4_tbl a cross join (select f1 as g) ss;
ERROR: column "f1" does not exist
LINE 1: select f1,g from int4_tbl a cross join (select f1 as g) ss;
^
HINT: There is a column named "f1" in table "a", but it cannot be referenced from this part of the query.
select f1,g from int4_tbl a cross join (select a.f1 as g) ss;
ERROR: invalid reference to FROM-clause entry for table "a"
LINE 1: select f1,g from int4_tbl a cross join (select a.f1 as g) ss...
^
HINT: There is an entry for table "a", but it cannot be referenced from this part of the query.
-- SQL:2008 says the left table is in scope but illegal to access here
select f1,g from int4_tbl a right join lateral generate_series(0, a.f1) g on true;
ERROR: invalid reference to FROM-clause entry for table "a"
LINE 1: ... int4_tbl a right join lateral generate_series(0, a.f1) g on...
^
DETAIL: The combining JOIN type must be INNER or LEFT for a LATERAL reference.
select f1,g from int4_tbl a full join lateral generate_series(0, a.f1) g on true;
ERROR: invalid reference to FROM-clause entry for table "a"
LINE 1: ...m int4_tbl a full join lateral generate_series(0, a.f1) g on...
^
DETAIL: The combining JOIN type must be INNER or LEFT for a LATERAL reference.
-- check we complain about ambiguous table references
select * from
int8_tbl x cross join (int4_tbl x cross join lateral (select x.f1) ss);
ERROR: table reference "x" is ambiguous
LINE 2: ...cross join (int4_tbl x cross join lateral (select x.f1) ss);
^
-- LATERAL can be used to put an aggregate into the FROM clause of its query
select 1 from tenk1 a, lateral (select max(a.unique1) from int4_tbl b) ss;
ERROR: aggregate functions are not allowed in FROM clause of their own query level
LINE 1: select 1 from tenk1 a, lateral (select max(a.unique1) from i...
^
-- check behavior of LATERAL in UPDATE/DELETE
create temp table xx1 as select f1 as x1, -f1 as x2 from int4_tbl;
-- error, can't do this:
update xx1 set x2 = f1 from (select * from int4_tbl where f1 = x1) ss;
ERROR: column "x1" does not exist
LINE 1: ... set x2 = f1 from (select * from int4_tbl where f1 = x1) ss;
^
HINT: There is a column named "x1" in table "xx1", but it cannot be referenced from this part of the query.
update xx1 set x2 = f1 from (select * from int4_tbl where f1 = xx1.x1) ss;
ERROR: invalid reference to FROM-clause entry for table "xx1"
LINE 1: ...t x2 = f1 from (select * from int4_tbl where f1 = xx1.x1) ss...
^
HINT: There is an entry for table "xx1", but it cannot be referenced from this part of the query.
-- can't do it even with LATERAL:
update xx1 set x2 = f1 from lateral (select * from int4_tbl where f1 = x1) ss;
ERROR: invalid reference to FROM-clause entry for table "xx1"
LINE 1: ...= f1 from lateral (select * from int4_tbl where f1 = x1) ss;
^
HINT: There is an entry for table "xx1", but it cannot be referenced from this part of the query.
-- we might in future allow something like this, but for now it's an error:
update xx1 set x2 = f1 from xx1, lateral (select * from int4_tbl where f1 = x1) ss;
ERROR: table name "xx1" specified more than once
-- also errors:
delete from xx1 using (select * from int4_tbl where f1 = x1) ss;
ERROR: column "x1" does not exist
LINE 1: ...te from xx1 using (select * from int4_tbl where f1 = x1) ss;
^
HINT: There is a column named "x1" in table "xx1", but it cannot be referenced from this part of the query.
delete from xx1 using (select * from int4_tbl where f1 = xx1.x1) ss;
ERROR: invalid reference to FROM-clause entry for table "xx1"
LINE 1: ...from xx1 using (select * from int4_tbl where f1 = xx1.x1) ss...
^
HINT: There is an entry for table "xx1", but it cannot be referenced from this part of the query.
delete from xx1 using lateral (select * from int4_tbl where f1 = x1) ss;
ERROR: invalid reference to FROM-clause entry for table "xx1"
LINE 1: ...xx1 using lateral (select * from int4_tbl where f1 = x1) ss;
^
HINT: There is an entry for table "xx1", but it cannot be referenced from this part of the query.
--
-- test LATERAL reference propagation down a multi-level inheritance hierarchy
-- produced for a multi-level partitioned table hierarchy.
--
create table join_pt1 (a int, b int, c varchar) partition by range(a);
create table join_pt1p1 partition of join_pt1 for values from (0) to (100) partition by range(b);
create table join_pt1p2 partition of join_pt1 for values from (100) to (200);
create table join_pt1p1p1 partition of join_pt1p1 for values from (0) to (100);
insert into join_pt1 values (1, 1, 'x'), (101, 101, 'y');
create table join_ut1 (a int, b int, c varchar);
insert into join_ut1 values (101, 101, 'y'), (2, 2, 'z');
explain (verbose, costs off)
select t1.b, ss.phv from join_ut1 t1 left join lateral
(select t2.a as t2a, t3.a t3a, least(t1.a, t2.a, t3.a) phv
from join_pt1 t2 join join_ut1 t3 on t2.a = t3.b) ss
on t1.a = ss.t2a order by t1.a;
QUERY PLAN
--------------------------------------------------------------------
Sort
Output: t1.b, (LEAST(t1.a, t2.a, t3.a)), t1.a
Sort Key: t1.a
-> Nested Loop Left Join
Output: t1.b, (LEAST(t1.a, t2.a, t3.a)), t1.a
-> Seq Scan on public.join_ut1 t1
Output: t1.a, t1.b, t1.c
-> Hash Join
Output: t2.a, LEAST(t1.a, t2.a, t3.a)
Hash Cond: (t3.b = t2.a)
-> Seq Scan on public.join_ut1 t3
Output: t3.a, t3.b, t3.c
-> Hash
Output: t2.a
-> Append
-> Seq Scan on public.join_pt1p1p1 t2_1
Output: t2_1.a
Filter: (t1.a = t2_1.a)
-> Seq Scan on public.join_pt1p2 t2_2
Output: t2_2.a
Filter: (t1.a = t2_2.a)
(21 rows)
select t1.b, ss.phv from join_ut1 t1 left join lateral
(select t2.a as t2a, t3.a t3a, least(t1.a, t2.a, t3.a) phv
from join_pt1 t2 join join_ut1 t3 on t2.a = t3.b) ss
on t1.a = ss.t2a order by t1.a;
b | phv
-----+-----
2 |
101 | 101
(2 rows)
drop table join_pt1;
drop table join_ut1;
--
-- test estimation behavior with multi-column foreign key and constant qual
--
begin;
create table fkest (x integer, x10 integer, x10b integer, x100 integer);
insert into fkest select x, x/10, x/10, x/100 from generate_series(1,1000) x;
create unique index on fkest(x, x10, x100);
analyze fkest;
explain (costs off)
select * from fkest f1
join fkest f2 on (f1.x = f2.x and f1.x10 = f2.x10b and f1.x100 = f2.x100)
join fkest f3 on f1.x = f3.x
where f1.x100 = 2;
QUERY PLAN
-----------------------------------------------------------
Nested Loop
-> Hash Join
Hash Cond: ((f2.x = f1.x) AND (f2.x10b = f1.x10))
-> Seq Scan on fkest f2
Filter: (x100 = 2)
-> Hash
-> Seq Scan on fkest f1
Filter: (x100 = 2)
-> Index Scan using fkest_x_x10_x100_idx on fkest f3
Index Cond: (x = f1.x)
(10 rows)
alter table fkest add constraint fk
foreign key (x, x10b, x100) references fkest (x, x10, x100);
explain (costs off)
select * from fkest f1
join fkest f2 on (f1.x = f2.x and f1.x10 = f2.x10b and f1.x100 = f2.x100)
join fkest f3 on f1.x = f3.x
where f1.x100 = 2;
QUERY PLAN
-----------------------------------------------------
Hash Join
Hash Cond: ((f2.x = f1.x) AND (f2.x10b = f1.x10))
-> Hash Join
Hash Cond: (f3.x = f2.x)
-> Seq Scan on fkest f3
-> Hash
-> Seq Scan on fkest f2
Filter: (x100 = 2)
-> Hash
-> Seq Scan on fkest f1
Filter: (x100 = 2)
(11 rows)
rollback;
--
-- test that foreign key join estimation performs sanely for outer joins
--
begin;
create table fkest (a int, b int, c int unique, primary key(a,b));
create table fkest1 (a int, b int, primary key(a,b));
insert into fkest select x/10, x%10, x from generate_series(1,1000) x;
insert into fkest1 select x/10, x%10 from generate_series(1,1000) x;
alter table fkest1
add constraint fkest1_a_b_fkey foreign key (a,b) references fkest;
analyze fkest;
analyze fkest1;
explain (costs off)
select *
from fkest f
left join fkest1 f1 on f.a = f1.a and f.b = f1.b
left join fkest1 f2 on f.a = f2.a and f.b = f2.b
left join fkest1 f3 on f.a = f3.a and f.b = f3.b
where f.c = 1;
QUERY PLAN
------------------------------------------------------------------
Nested Loop Left Join
-> Nested Loop Left Join
-> Nested Loop Left Join
-> Index Scan using fkest_c_key on fkest f
Index Cond: (c = 1)
-> Index Only Scan using fkest1_pkey on fkest1 f1
Index Cond: ((a = f.a) AND (b = f.b))
-> Index Only Scan using fkest1_pkey on fkest1 f2
Index Cond: ((a = f.a) AND (b = f.b))
-> Index Only Scan using fkest1_pkey on fkest1 f3
Index Cond: ((a = f.a) AND (b = f.b))
(11 rows)
rollback;
--
-- test planner's ability to mark joins as unique
--
create table j1 (id int primary key);
create table j2 (id int primary key);
create table j3 (id int);
insert into j1 values(1),(2),(3);
insert into j2 values(1),(2),(3);
insert into j3 values(1),(1);
analyze j1;
analyze j2;
analyze j3;
-- ensure join is properly marked as unique
explain (verbose, costs off)
select * from j1 inner join j2 on j1.id = j2.id;
QUERY PLAN
-----------------------------------
Hash Join
Output: j1.id, j2.id
Inner Unique: true
Hash Cond: (j1.id = j2.id)
-> Seq Scan on public.j1
Output: j1.id
-> Hash
Output: j2.id
-> Seq Scan on public.j2
Output: j2.id
(10 rows)
-- ensure join is not unique when not an equi-join
explain (verbose, costs off)
select * from j1 inner join j2 on j1.id > j2.id;
QUERY PLAN
-----------------------------------
Nested Loop
Output: j1.id, j2.id
Join Filter: (j1.id > j2.id)
-> Seq Scan on public.j1
Output: j1.id
-> Materialize
Output: j2.id
-> Seq Scan on public.j2
Output: j2.id
(9 rows)
-- ensure non-unique rel is not chosen as inner
explain (verbose, costs off)
select * from j1 inner join j3 on j1.id = j3.id;
QUERY PLAN
-----------------------------------
Hash Join
Output: j1.id, j3.id
Inner Unique: true
Hash Cond: (j3.id = j1.id)
-> Seq Scan on public.j3
Output: j3.id
-> Hash
Output: j1.id
-> Seq Scan on public.j1
Output: j1.id
(10 rows)
-- ensure left join is marked as unique
explain (verbose, costs off)
select * from j1 left join j2 on j1.id = j2.id;
QUERY PLAN
-----------------------------------
Hash Left Join
Output: j1.id, j2.id
Inner Unique: true
Hash Cond: (j1.id = j2.id)
-> Seq Scan on public.j1
Output: j1.id
-> Hash
Output: j2.id
-> Seq Scan on public.j2
Output: j2.id
(10 rows)
-- ensure right join is marked as unique
explain (verbose, costs off)
select * from j1 right join j2 on j1.id = j2.id;
QUERY PLAN
-----------------------------------
Hash Left Join
Output: j1.id, j2.id
Inner Unique: true
Hash Cond: (j2.id = j1.id)
-> Seq Scan on public.j2
Output: j2.id
-> Hash
Output: j1.id
-> Seq Scan on public.j1
Output: j1.id
(10 rows)
-- ensure full join is marked as unique
explain (verbose, costs off)
select * from j1 full join j2 on j1.id = j2.id;
QUERY PLAN
-----------------------------------
Hash Full Join
Output: j1.id, j2.id
Inner Unique: true
Hash Cond: (j1.id = j2.id)
-> Seq Scan on public.j1
Output: j1.id
-> Hash
Output: j2.id
-> Seq Scan on public.j2
Output: j2.id
(10 rows)
-- a clauseless (cross) join can't be unique
explain (verbose, costs off)
select * from j1 cross join j2;
QUERY PLAN
-----------------------------------
Nested Loop
Output: j1.id, j2.id
-> Seq Scan on public.j1
Output: j1.id
-> Materialize
Output: j2.id
-> Seq Scan on public.j2
Output: j2.id
(8 rows)
-- ensure a natural join is marked as unique
explain (verbose, costs off)
select * from j1 natural join j2;
QUERY PLAN
-----------------------------------
Hash Join
Output: j1.id
Inner Unique: true
Hash Cond: (j1.id = j2.id)
-> Seq Scan on public.j1
Output: j1.id
-> Hash
Output: j2.id
-> Seq Scan on public.j2
Output: j2.id
(10 rows)
-- ensure a distinct clause allows the inner to become unique
explain (verbose, costs off)
select * from j1
inner join (select distinct id from j3) j3 on j1.id = j3.id;
QUERY PLAN
-----------------------------------------
Nested Loop
Output: j1.id, j3.id
Inner Unique: true
Join Filter: (j1.id = j3.id)
-> Unique
Output: j3.id
-> Sort
Output: j3.id
Sort Key: j3.id
-> Seq Scan on public.j3
Output: j3.id
-> Seq Scan on public.j1
Output: j1.id
(13 rows)
-- ensure group by clause allows the inner to become unique
explain (verbose, costs off)
select * from j1
inner join (select id from j3 group by id) j3 on j1.id = j3.id;
QUERY PLAN
-----------------------------------------
Nested Loop
Output: j1.id, j3.id
Inner Unique: true
Join Filter: (j1.id = j3.id)
-> Group
Output: j3.id
Group Key: j3.id
-> Sort
Output: j3.id
Sort Key: j3.id
-> Seq Scan on public.j3
Output: j3.id
-> Seq Scan on public.j1
Output: j1.id
(14 rows)
drop table j1;
drop table j2;
drop table j3;
-- test more complex permutations of unique joins
create table j1 (id1 int, id2 int, primary key(id1,id2));
create table j2 (id1 int, id2 int, primary key(id1,id2));
create table j3 (id1 int, id2 int, primary key(id1,id2));
insert into j1 values(1,1),(1,2);
insert into j2 values(1,1);
insert into j3 values(1,1);
analyze j1;
analyze j2;
analyze j3;
-- ensure there's no unique join when not all columns which are part of the
-- unique index are seen in the join clause
explain (verbose, costs off)
select * from j1
inner join j2 on j1.id1 = j2.id1;
QUERY PLAN
------------------------------------------
Nested Loop
Output: j1.id1, j1.id2, j2.id1, j2.id2
Join Filter: (j1.id1 = j2.id1)
-> Seq Scan on public.j2
Output: j2.id1, j2.id2
-> Seq Scan on public.j1
Output: j1.id1, j1.id2
(7 rows)
-- ensure proper unique detection with multiple join quals
explain (verbose, costs off)
select * from j1
inner join j2 on j1.id1 = j2.id1 and j1.id2 = j2.id2;
QUERY PLAN
----------------------------------------------------------
Nested Loop
Output: j1.id1, j1.id2, j2.id1, j2.id2
Inner Unique: true
Join Filter: ((j1.id1 = j2.id1) AND (j1.id2 = j2.id2))
-> Seq Scan on public.j2
Output: j2.id1, j2.id2
-> Seq Scan on public.j1
Output: j1.id1, j1.id2
(8 rows)
-- ensure we don't detect the join to be unique when quals are not part of the
-- join condition
explain (verbose, costs off)
select * from j1
inner join j2 on j1.id1 = j2.id1 where j1.id2 = 1;
QUERY PLAN
------------------------------------------
Nested Loop
Output: j1.id1, j1.id2, j2.id1, j2.id2
Join Filter: (j1.id1 = j2.id1)
-> Seq Scan on public.j1
Output: j1.id1, j1.id2
Filter: (j1.id2 = 1)
-> Seq Scan on public.j2
Output: j2.id1, j2.id2
(8 rows)
-- as above, but for left joins.
explain (verbose, costs off)
select * from j1
left join j2 on j1.id1 = j2.id1 where j1.id2 = 1;
QUERY PLAN
------------------------------------------
Nested Loop Left Join
Output: j1.id1, j1.id2, j2.id1, j2.id2
Join Filter: (j1.id1 = j2.id1)
-> Seq Scan on public.j1
Output: j1.id1, j1.id2
Filter: (j1.id2 = 1)
-> Seq Scan on public.j2
Output: j2.id1, j2.id2
(8 rows)
-- validate logic in merge joins which skips mark and restore.
-- it should only do this if all quals which were used to detect the unique
-- are present as join quals, and not plain quals.
set enable_nestloop to 0;
set enable_hashjoin to 0;
set enable_sort to 0;
-- create indexes that will be preferred over the PKs to perform the join
create index j1_id1_idx on j1 (id1) where id1 % 1000 = 1;
create index j2_id1_idx on j2 (id1) where id1 % 1000 = 1;
-- need an additional row in j2, if we want j2_id1_idx to be preferred
insert into j2 values(1,2);
analyze j2;
explain (costs off) select * from j1
inner join j2 on j1.id1 = j2.id1 and j1.id2 = j2.id2
where j1.id1 % 1000 = 1 and j2.id1 % 1000 = 1;
QUERY PLAN
-----------------------------------------
Merge Join
Merge Cond: (j1.id1 = j2.id1)
Join Filter: (j1.id2 = j2.id2)
-> Index Scan using j1_id1_idx on j1
-> Index Scan using j2_id1_idx on j2
(5 rows)
select * from j1
inner join j2 on j1.id1 = j2.id1 and j1.id2 = j2.id2
where j1.id1 % 1000 = 1 and j2.id1 % 1000 = 1;
id1 | id2 | id1 | id2
-----+-----+-----+-----
1 | 1 | 1 | 1
1 | 2 | 1 | 2
(2 rows)
-- Exercise array keys mark/restore B-Tree code
explain (costs off) select * from j1
inner join j2 on j1.id1 = j2.id1 and j1.id2 = j2.id2
where j1.id1 % 1000 = 1 and j2.id1 % 1000 = 1 and j2.id1 = any (array[1]);
QUERY PLAN
----------------------------------------------------
Merge Join
Merge Cond: (j1.id1 = j2.id1)
Join Filter: (j1.id2 = j2.id2)
-> Index Scan using j1_id1_idx on j1
-> Index Scan using j2_id1_idx on j2
Index Cond: (id1 = ANY ('{1}'::integer[]))
(6 rows)
select * from j1
inner join j2 on j1.id1 = j2.id1 and j1.id2 = j2.id2
where j1.id1 % 1000 = 1 and j2.id1 % 1000 = 1 and j2.id1 = any (array[1]);
id1 | id2 | id1 | id2
-----+-----+-----+-----
1 | 1 | 1 | 1
1 | 2 | 1 | 2
(2 rows)
-- Exercise array keys "find extreme element" B-Tree code
explain (costs off) select * from j1
inner join j2 on j1.id1 = j2.id1 and j1.id2 = j2.id2
where j1.id1 % 1000 = 1 and j2.id1 % 1000 = 1 and j2.id1 >= any (array[1,5]);
QUERY PLAN
-------------------------------------------------------
Merge Join
Merge Cond: (j1.id1 = j2.id1)
Join Filter: (j1.id2 = j2.id2)
-> Index Scan using j1_id1_idx on j1
-> Index Only Scan using j2_pkey on j2
Index Cond: (id1 >= ANY ('{1,5}'::integer[]))
Filter: ((id1 % 1000) = 1)
(7 rows)
select * from j1
inner join j2 on j1.id1 = j2.id1 and j1.id2 = j2.id2
where j1.id1 % 1000 = 1 and j2.id1 % 1000 = 1 and j2.id1 >= any (array[1,5]);
id1 | id2 | id1 | id2
-----+-----+-----+-----
1 | 1 | 1 | 1
1 | 2 | 1 | 2
(2 rows)
reset enable_nestloop;
reset enable_hashjoin;
reset enable_sort;
drop table j1;
drop table j2;
drop table j3;
-- check that semijoin inner is not seen as unique for a portion of the outerrel
explain (verbose, costs off)
select t1.unique1, t2.hundred
from onek t1, tenk1 t2
where exists (select 1 from tenk1 t3
where t3.thousand = t1.unique1 and t3.tenthous = t2.hundred)
and t1.unique1 < 1;
QUERY PLAN
---------------------------------------------------------------------------------
Nested Loop
Output: t1.unique1, t2.hundred
-> Hash Join
Output: t1.unique1, t3.tenthous
Hash Cond: (t3.thousand = t1.unique1)
-> HashAggregate
Output: t3.thousand, t3.tenthous
Group Key: t3.thousand, t3.tenthous
-> Index Only Scan using tenk1_thous_tenthous on public.tenk1 t3
Output: t3.thousand, t3.tenthous
-> Hash
Output: t1.unique1
-> Index Only Scan using onek_unique1 on public.onek t1
Output: t1.unique1
Index Cond: (t1.unique1 < 1)
-> Index Only Scan using tenk1_hundred on public.tenk1 t2
Output: t2.hundred
Index Cond: (t2.hundred = t3.tenthous)
(18 rows)
-- ... unless it actually is unique
create table j3 as select unique1, tenthous from onek;
vacuum analyze j3;
create unique index on j3(unique1, tenthous);
explain (verbose, costs off)
select t1.unique1, t2.hundred
from onek t1, tenk1 t2
where exists (select 1 from j3
where j3.unique1 = t1.unique1 and j3.tenthous = t2.hundred)
and t1.unique1 < 1;
QUERY PLAN
------------------------------------------------------------------------
Nested Loop
Output: t1.unique1, t2.hundred
-> Nested Loop
Output: t1.unique1, j3.tenthous
-> Index Only Scan using onek_unique1 on public.onek t1
Output: t1.unique1
Index Cond: (t1.unique1 < 1)
-> Index Only Scan using j3_unique1_tenthous_idx on public.j3
Output: j3.unique1, j3.tenthous
Index Cond: (j3.unique1 = t1.unique1)
-> Index Only Scan using tenk1_hundred on public.tenk1 t2
Output: t2.hundred
Index Cond: (t2.hundred = j3.tenthous)
(13 rows)
drop table j3;
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