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postgresql/src/test/regress/expected/cluster.out

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--
-- CLUSTER
--
CREATE TABLE clstr_tst_s (rf_a SERIAL PRIMARY KEY,
b INT);
CREATE TABLE clstr_tst (a SERIAL PRIMARY KEY,
b INT,
c TEXT,
d TEXT,
CONSTRAINT clstr_tst_con FOREIGN KEY (b) REFERENCES clstr_tst_s);
CREATE INDEX clstr_tst_b ON clstr_tst (b);
CREATE INDEX clstr_tst_c ON clstr_tst (c);
CREATE INDEX clstr_tst_c_b ON clstr_tst (c,b);
CREATE INDEX clstr_tst_b_c ON clstr_tst (b,c);
INSERT INTO clstr_tst_s (b) VALUES (0);
INSERT INTO clstr_tst_s (b) SELECT b FROM clstr_tst_s;
INSERT INTO clstr_tst_s (b) SELECT b FROM clstr_tst_s;
INSERT INTO clstr_tst_s (b) SELECT b FROM clstr_tst_s;
INSERT INTO clstr_tst_s (b) SELECT b FROM clstr_tst_s;
INSERT INTO clstr_tst_s (b) SELECT b FROM clstr_tst_s;
CREATE TABLE clstr_tst_inh () INHERITS (clstr_tst);
INSERT INTO clstr_tst (b, c) VALUES (11, 'once');
INSERT INTO clstr_tst (b, c) VALUES (10, 'diez');
INSERT INTO clstr_tst (b, c) VALUES (31, 'treinta y uno');
INSERT INTO clstr_tst (b, c) VALUES (22, 'veintidos');
INSERT INTO clstr_tst (b, c) VALUES (3, 'tres');
INSERT INTO clstr_tst (b, c) VALUES (20, 'veinte');
INSERT INTO clstr_tst (b, c) VALUES (23, 'veintitres');
INSERT INTO clstr_tst (b, c) VALUES (21, 'veintiuno');
INSERT INTO clstr_tst (b, c) VALUES (4, 'cuatro');
INSERT INTO clstr_tst (b, c) VALUES (14, 'catorce');
INSERT INTO clstr_tst (b, c) VALUES (2, 'dos');
INSERT INTO clstr_tst (b, c) VALUES (18, 'dieciocho');
INSERT INTO clstr_tst (b, c) VALUES (27, 'veintisiete');
INSERT INTO clstr_tst (b, c) VALUES (25, 'veinticinco');
INSERT INTO clstr_tst (b, c) VALUES (13, 'trece');
INSERT INTO clstr_tst (b, c) VALUES (28, 'veintiocho');
INSERT INTO clstr_tst (b, c) VALUES (32, 'treinta y dos');
INSERT INTO clstr_tst (b, c) VALUES (5, 'cinco');
INSERT INTO clstr_tst (b, c) VALUES (29, 'veintinueve');
INSERT INTO clstr_tst (b, c) VALUES (1, 'uno');
INSERT INTO clstr_tst (b, c) VALUES (24, 'veinticuatro');
INSERT INTO clstr_tst (b, c) VALUES (30, 'treinta');
INSERT INTO clstr_tst (b, c) VALUES (12, 'doce');
INSERT INTO clstr_tst (b, c) VALUES (17, 'diecisiete');
INSERT INTO clstr_tst (b, c) VALUES (9, 'nueve');
INSERT INTO clstr_tst (b, c) VALUES (19, 'diecinueve');
INSERT INTO clstr_tst (b, c) VALUES (26, 'veintiseis');
INSERT INTO clstr_tst (b, c) VALUES (15, 'quince');
INSERT INTO clstr_tst (b, c) VALUES (7, 'siete');
INSERT INTO clstr_tst (b, c) VALUES (16, 'dieciseis');
INSERT INTO clstr_tst (b, c) VALUES (8, 'ocho');
-- This entry is needed to test that TOASTED values are copied correctly.
INSERT INTO clstr_tst (b, c, d) VALUES (6, 'seis', repeat('xyzzy', 100000));
CLUSTER clstr_tst_c ON clstr_tst;
SELECT a,b,c,substring(d for 30), length(d) from clstr_tst;
a | b | c | substring | length
----+----+---------------+--------------------------------+--------
10 | 14 | catorce | |
18 | 5 | cinco | |
9 | 4 | cuatro | |
26 | 19 | diecinueve | |
12 | 18 | dieciocho | |
30 | 16 | dieciseis | |
24 | 17 | diecisiete | |
2 | 10 | diez | |
23 | 12 | doce | |
11 | 2 | dos | |
25 | 9 | nueve | |
31 | 8 | ocho | |
1 | 11 | once | |
28 | 15 | quince | |
32 | 6 | seis | xyzzyxyzzyxyzzyxyzzyxyzzyxyzzy | 500000
29 | 7 | siete | |
15 | 13 | trece | |
22 | 30 | treinta | |
17 | 32 | treinta y dos | |
3 | 31 | treinta y uno | |
5 | 3 | tres | |
20 | 1 | uno | |
6 | 20 | veinte | |
14 | 25 | veinticinco | |
21 | 24 | veinticuatro | |
4 | 22 | veintidos | |
19 | 29 | veintinueve | |
16 | 28 | veintiocho | |
27 | 26 | veintiseis | |
13 | 27 | veintisiete | |
7 | 23 | veintitres | |
8 | 21 | veintiuno | |
(32 rows)
SELECT a,b,c,substring(d for 30), length(d) from clstr_tst ORDER BY a;
a | b | c | substring | length
----+----+---------------+--------------------------------+--------
1 | 11 | once | |
2 | 10 | diez | |
3 | 31 | treinta y uno | |
4 | 22 | veintidos | |
5 | 3 | tres | |
6 | 20 | veinte | |
7 | 23 | veintitres | |
8 | 21 | veintiuno | |
9 | 4 | cuatro | |
10 | 14 | catorce | |
11 | 2 | dos | |
12 | 18 | dieciocho | |
13 | 27 | veintisiete | |
14 | 25 | veinticinco | |
15 | 13 | trece | |
16 | 28 | veintiocho | |
17 | 32 | treinta y dos | |
18 | 5 | cinco | |
19 | 29 | veintinueve | |
20 | 1 | uno | |
21 | 24 | veinticuatro | |
22 | 30 | treinta | |
23 | 12 | doce | |
24 | 17 | diecisiete | |
25 | 9 | nueve | |
26 | 19 | diecinueve | |
27 | 26 | veintiseis | |
28 | 15 | quince | |
29 | 7 | siete | |
30 | 16 | dieciseis | |
31 | 8 | ocho | |
32 | 6 | seis | xyzzyxyzzyxyzzyxyzzyxyzzyxyzzy | 500000
(32 rows)
SELECT a,b,c,substring(d for 30), length(d) from clstr_tst ORDER BY b;
a | b | c | substring | length
----+----+---------------+--------------------------------+--------
20 | 1 | uno | |
11 | 2 | dos | |
5 | 3 | tres | |
9 | 4 | cuatro | |
18 | 5 | cinco | |
32 | 6 | seis | xyzzyxyzzyxyzzyxyzzyxyzzyxyzzy | 500000
29 | 7 | siete | |
31 | 8 | ocho | |
25 | 9 | nueve | |
2 | 10 | diez | |
1 | 11 | once | |
23 | 12 | doce | |
15 | 13 | trece | |
10 | 14 | catorce | |
28 | 15 | quince | |
30 | 16 | dieciseis | |
24 | 17 | diecisiete | |
12 | 18 | dieciocho | |
26 | 19 | diecinueve | |
6 | 20 | veinte | |
8 | 21 | veintiuno | |
4 | 22 | veintidos | |
7 | 23 | veintitres | |
21 | 24 | veinticuatro | |
14 | 25 | veinticinco | |
27 | 26 | veintiseis | |
13 | 27 | veintisiete | |
16 | 28 | veintiocho | |
19 | 29 | veintinueve | |
22 | 30 | treinta | |
3 | 31 | treinta y uno | |
17 | 32 | treinta y dos | |
(32 rows)
SELECT a,b,c,substring(d for 30), length(d) from clstr_tst ORDER BY c;
a | b | c | substring | length
----+----+---------------+--------------------------------+--------
10 | 14 | catorce | |
18 | 5 | cinco | |
9 | 4 | cuatro | |
26 | 19 | diecinueve | |
12 | 18 | dieciocho | |
30 | 16 | dieciseis | |
24 | 17 | diecisiete | |
2 | 10 | diez | |
23 | 12 | doce | |
11 | 2 | dos | |
25 | 9 | nueve | |
31 | 8 | ocho | |
1 | 11 | once | |
28 | 15 | quince | |
32 | 6 | seis | xyzzyxyzzyxyzzyxyzzyxyzzyxyzzy | 500000
29 | 7 | siete | |
15 | 13 | trece | |
22 | 30 | treinta | |
17 | 32 | treinta y dos | |
3 | 31 | treinta y uno | |
5 | 3 | tres | |
20 | 1 | uno | |
6 | 20 | veinte | |
14 | 25 | veinticinco | |
21 | 24 | veinticuatro | |
4 | 22 | veintidos | |
19 | 29 | veintinueve | |
16 | 28 | veintiocho | |
27 | 26 | veintiseis | |
13 | 27 | veintisiete | |
7 | 23 | veintitres | |
8 | 21 | veintiuno | |
(32 rows)
-- Verify that inheritance link still works
INSERT INTO clstr_tst_inh VALUES (0, 100, 'in child table');
SELECT a,b,c,substring(d for 30), length(d) from clstr_tst;
a | b | c | substring | length
----+-----+----------------+--------------------------------+--------
10 | 14 | catorce | |
18 | 5 | cinco | |
9 | 4 | cuatro | |
26 | 19 | diecinueve | |
12 | 18 | dieciocho | |
30 | 16 | dieciseis | |
24 | 17 | diecisiete | |
2 | 10 | diez | |
23 | 12 | doce | |
11 | 2 | dos | |
25 | 9 | nueve | |
31 | 8 | ocho | |
1 | 11 | once | |
28 | 15 | quince | |
32 | 6 | seis | xyzzyxyzzyxyzzyxyzzyxyzzyxyzzy | 500000
29 | 7 | siete | |
15 | 13 | trece | |
22 | 30 | treinta | |
17 | 32 | treinta y dos | |
3 | 31 | treinta y uno | |
5 | 3 | tres | |
20 | 1 | uno | |
6 | 20 | veinte | |
14 | 25 | veinticinco | |
21 | 24 | veinticuatro | |
4 | 22 | veintidos | |
19 | 29 | veintinueve | |
16 | 28 | veintiocho | |
27 | 26 | veintiseis | |
13 | 27 | veintisiete | |
7 | 23 | veintitres | |
8 | 21 | veintiuno | |
0 | 100 | in child table | |
(33 rows)
-- Verify that foreign key link still works
INSERT INTO clstr_tst (b, c) VALUES (1111, 'this should fail');
ERROR: insert or update on table "clstr_tst" violates foreign key constraint "clstr_tst_con"
DETAIL: Key (b)=(1111) is not present in table "clstr_tst_s".
SELECT conname FROM pg_constraint WHERE conrelid = 'clstr_tst'::regclass
ORDER BY 1;
conname
----------------------
clstr_tst_a_not_null
clstr_tst_con
clstr_tst_pkey
(3 rows)
SELECT relname, relkind,
EXISTS(SELECT 1 FROM pg_class WHERE oid = c.reltoastrelid) AS hastoast
FROM pg_class c WHERE relname LIKE 'clstr_tst%' ORDER BY relname;
relname | relkind | hastoast
----------------------+---------+----------
clstr_tst | r | t
clstr_tst_a_seq | S | f
clstr_tst_b | i | f
clstr_tst_b_c | i | f
clstr_tst_c | i | f
clstr_tst_c_b | i | f
clstr_tst_inh | r | t
clstr_tst_pkey | i | f
clstr_tst_s | r | f
clstr_tst_s_pkey | i | f
clstr_tst_s_rf_a_seq | S | f
(11 rows)
-- Verify that indisclustered is correctly set
SELECT pg_class.relname FROM pg_index, pg_class, pg_class AS pg_class_2
WHERE pg_class.oid=indexrelid
AND indrelid=pg_class_2.oid
AND pg_class_2.relname = 'clstr_tst'
AND indisclustered;
relname
-------------
clstr_tst_c
(1 row)
-- Try changing indisclustered
ALTER TABLE clstr_tst CLUSTER ON clstr_tst_b_c;
SELECT pg_class.relname FROM pg_index, pg_class, pg_class AS pg_class_2
WHERE pg_class.oid=indexrelid
AND indrelid=pg_class_2.oid
AND pg_class_2.relname = 'clstr_tst'
AND indisclustered;
relname
---------------
clstr_tst_b_c
(1 row)
-- Try turning off all clustering
ALTER TABLE clstr_tst SET WITHOUT CLUSTER;
SELECT pg_class.relname FROM pg_index, pg_class, pg_class AS pg_class_2
WHERE pg_class.oid=indexrelid
AND indrelid=pg_class_2.oid
AND pg_class_2.relname = 'clstr_tst'
AND indisclustered;
relname
---------
(0 rows)
-- Verify that toast tables are clusterable
CLUSTER pg_toast.pg_toast_826 USING pg_toast_826_index;
-- Verify that clustering all tables does in fact cluster the right ones
CREATE USER regress_clstr_user;
CREATE TABLE clstr_1 (a INT PRIMARY KEY);
CREATE TABLE clstr_2 (a INT PRIMARY KEY);
CREATE TABLE clstr_3 (a INT PRIMARY KEY);
ALTER TABLE clstr_1 OWNER TO regress_clstr_user;
ALTER TABLE clstr_3 OWNER TO regress_clstr_user;
GRANT SELECT ON clstr_2 TO regress_clstr_user;
INSERT INTO clstr_1 VALUES (2);
INSERT INTO clstr_1 VALUES (1);
INSERT INTO clstr_2 VALUES (2);
INSERT INTO clstr_2 VALUES (1);
INSERT INTO clstr_3 VALUES (2);
INSERT INTO clstr_3 VALUES (1);
-- "CLUSTER <tablename>" on a table that hasn't been clustered
CLUSTER clstr_2;
ERROR: there is no previously clustered index for table "clstr_2"
CLUSTER clstr_1_pkey ON clstr_1;
CLUSTER clstr_2 USING clstr_2_pkey;
SELECT * FROM clstr_1 UNION ALL
SELECT * FROM clstr_2 UNION ALL
SELECT * FROM clstr_3;
a
---
1
2
1
2
2
1
(6 rows)
-- revert to the original state
DELETE FROM clstr_1;
DELETE FROM clstr_2;
DELETE FROM clstr_3;
INSERT INTO clstr_1 VALUES (2);
INSERT INTO clstr_1 VALUES (1);
INSERT INTO clstr_2 VALUES (2);
INSERT INTO clstr_2 VALUES (1);
INSERT INTO clstr_3 VALUES (2);
INSERT INTO clstr_3 VALUES (1);
-- this user can only cluster clstr_1 and clstr_3, but the latter
-- has not been clustered
SET SESSION AUTHORIZATION regress_clstr_user;
SET client_min_messages = ERROR; -- order of "skipping" warnings may vary
CLUSTER;
RESET client_min_messages;
SELECT * FROM clstr_1 UNION ALL
SELECT * FROM clstr_2 UNION ALL
SELECT * FROM clstr_3;
a
---
1
2
2
1
2
1
(6 rows)
-- cluster a single table using the indisclustered bit previously set
DELETE FROM clstr_1;
INSERT INTO clstr_1 VALUES (2);
INSERT INTO clstr_1 VALUES (1);
CLUSTER clstr_1;
SELECT * FROM clstr_1;
a
---
1
2
(2 rows)
-- Test MVCC-safety of cluster. There isn't much we can do to verify the
-- results with a single backend...
CREATE TABLE clustertest (key int PRIMARY KEY);
INSERT INTO clustertest VALUES (10);
INSERT INTO clustertest VALUES (20);
INSERT INTO clustertest VALUES (30);
INSERT INTO clustertest VALUES (40);
INSERT INTO clustertest VALUES (50);
-- Use a transaction so that updates are not committed when CLUSTER sees 'em
BEGIN;
-- Test update where the old row version is found first in the scan
UPDATE clustertest SET key = 100 WHERE key = 10;
-- Test update where the new row version is found first in the scan
UPDATE clustertest SET key = 35 WHERE key = 40;
-- Test longer update chain
UPDATE clustertest SET key = 60 WHERE key = 50;
UPDATE clustertest SET key = 70 WHERE key = 60;
UPDATE clustertest SET key = 80 WHERE key = 70;
SELECT * FROM clustertest;
key
-----
20
30
100
35
80
(5 rows)
CLUSTER clustertest_pkey ON clustertest;
SELECT * FROM clustertest;
key
-----
20
30
35
80
100
(5 rows)
COMMIT;
SELECT * FROM clustertest;
key
-----
20
30
35
80
100
(5 rows)
-- check that temp tables can be clustered
create temp table clstr_temp (col1 int primary key, col2 text);
insert into clstr_temp values (2, 'two'), (1, 'one');
cluster clstr_temp using clstr_temp_pkey;
select * from clstr_temp;
col1 | col2
------+------
1 | one
2 | two
(2 rows)
drop table clstr_temp;
RESET SESSION AUTHORIZATION;
-- check clustering an empty table
DROP TABLE clustertest;
CREATE TABLE clustertest (f1 int PRIMARY KEY);
CLUSTER clustertest USING clustertest_pkey;
CLUSTER clustertest;
-- Check that partitioned tables can be clustered
CREATE TABLE clstrpart (a int) PARTITION BY RANGE (a);
CREATE TABLE clstrpart1 PARTITION OF clstrpart FOR VALUES FROM (1) TO (10) PARTITION BY RANGE (a);
CREATE TABLE clstrpart11 PARTITION OF clstrpart1 FOR VALUES FROM (1) TO (5);
CREATE TABLE clstrpart12 PARTITION OF clstrpart1 FOR VALUES FROM (5) TO (10) PARTITION BY RANGE (a);
CREATE TABLE clstrpart2 PARTITION OF clstrpart FOR VALUES FROM (10) TO (20);
CREATE TABLE clstrpart3 PARTITION OF clstrpart DEFAULT PARTITION BY RANGE (a);
CREATE TABLE clstrpart33 PARTITION OF clstrpart3 DEFAULT;
CREATE INDEX clstrpart_only_idx ON ONLY clstrpart (a);
CLUSTER clstrpart USING clstrpart_only_idx; -- fails
ERROR: cannot cluster on invalid index "clstrpart_only_idx"
DROP INDEX clstrpart_only_idx;
CREATE INDEX clstrpart_idx ON clstrpart (a);
-- Check that clustering sets new relfilenodes:
CREATE TEMP TABLE old_cluster_info AS SELECT relname, level, relfilenode, relkind FROM pg_partition_tree('clstrpart'::regclass) AS tree JOIN pg_class c ON c.oid=tree.relid ;
CLUSTER clstrpart USING clstrpart_idx;
CREATE TEMP TABLE new_cluster_info AS SELECT relname, level, relfilenode, relkind FROM pg_partition_tree('clstrpart'::regclass) AS tree JOIN pg_class c ON c.oid=tree.relid ;
SELECT relname, old.level, old.relkind, old.relfilenode = new.relfilenode FROM old_cluster_info AS old JOIN new_cluster_info AS new USING (relname) ORDER BY relname COLLATE "C";
relname | level | relkind | ?column?
-------------+-------+---------+----------
clstrpart | 0 | p | t
clstrpart1 | 1 | p | t
clstrpart11 | 2 | r | f
clstrpart12 | 2 | p | t
clstrpart2 | 1 | r | f
clstrpart3 | 1 | p | t
clstrpart33 | 2 | r | f
(7 rows)
-- Partitioned indexes aren't and can't be marked un/clustered:
\d clstrpart
Partitioned table "public.clstrpart"
Column | Type | Collation | Nullable | Default
--------+---------+-----------+----------+---------
a | integer | | |
Partition key: RANGE (a)
Indexes:
"clstrpart_idx" btree (a)
Number of partitions: 3 (Use \d+ to list them.)
CLUSTER clstrpart;
ERROR: there is no previously clustered index for table "clstrpart"
ALTER TABLE clstrpart SET WITHOUT CLUSTER;
ERROR: cannot mark index clustered in partitioned table
ALTER TABLE clstrpart CLUSTER ON clstrpart_idx;
ERROR: cannot mark index clustered in partitioned table
DROP TABLE clstrpart;
-- Ownership of partitions is checked
CREATE TABLE ptnowner(i int unique) PARTITION BY LIST (i);
CREATE INDEX ptnowner_i_idx ON ptnowner(i);
CREATE TABLE ptnowner1 PARTITION OF ptnowner FOR VALUES IN (1);
CREATE ROLE regress_ptnowner;
CREATE TABLE ptnowner2 PARTITION OF ptnowner FOR VALUES IN (2);
ALTER TABLE ptnowner1 OWNER TO regress_ptnowner;
SET SESSION AUTHORIZATION regress_ptnowner;
CLUSTER ptnowner USING ptnowner_i_idx;
ERROR: permission denied for table ptnowner
RESET SESSION AUTHORIZATION;
ALTER TABLE ptnowner OWNER TO regress_ptnowner;
CREATE TEMP TABLE ptnowner_oldnodes AS
SELECT oid, relname, relfilenode FROM pg_partition_tree('ptnowner') AS tree
JOIN pg_class AS c ON c.oid=tree.relid;
SET SESSION AUTHORIZATION regress_ptnowner;
CLUSTER ptnowner USING ptnowner_i_idx;
WARNING: permission denied to cluster "ptnowner2", skipping it
RESET SESSION AUTHORIZATION;
SELECT a.relname, a.relfilenode=b.relfilenode FROM pg_class a
JOIN ptnowner_oldnodes b USING (oid) ORDER BY a.relname COLLATE "C";
relname | ?column?
-----------+----------
ptnowner | t
ptnowner1 | f
ptnowner2 | t
(3 rows)
DROP TABLE ptnowner;
DROP ROLE regress_ptnowner;
-- Test CLUSTER with external tuplesorting
create table clstr_4 as select * from tenk1;
create index cluster_sort on clstr_4 (hundred, thousand, tenthous);
-- ensure we don't use the index in CLUSTER nor the checking SELECTs
set enable_indexscan = off;
-- Use external sort:
set maintenance_work_mem = '1MB';
cluster clstr_4 using cluster_sort;
select * from
(select hundred, lag(hundred) over () as lhundred,
thousand, lag(thousand) over () as lthousand,
tenthous, lag(tenthous) over () as ltenthous from clstr_4) ss
where row(hundred, thousand, tenthous) <= row(lhundred, lthousand, ltenthous);
hundred | lhundred | thousand | lthousand | tenthous | ltenthous
---------+----------+----------+-----------+----------+-----------
(0 rows)
reset enable_indexscan;
reset maintenance_work_mem;
-- test CLUSTER on expression index
CREATE TABLE clstr_expression(id serial primary key, a int, b text COLLATE "C");
INSERT INTO clstr_expression(a, b) SELECT g.i % 42, 'prefix'||g.i FROM generate_series(1, 133) g(i);
CREATE INDEX clstr_expression_minus_a ON clstr_expression ((-a), b);
CREATE INDEX clstr_expression_upper_b ON clstr_expression ((upper(b)));
-- verify indexes work before cluster
BEGIN;
SET LOCAL enable_seqscan = false;
EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
QUERY PLAN
---------------------------------------------------------------
Index Scan using clstr_expression_upper_b on clstr_expression
Index Cond: (upper(b) = 'PREFIX3'::text)
(2 rows)
SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
id | a | b
----+---+---------
3 | 3 | prefix3
(1 row)
EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
QUERY PLAN
---------------------------------------------------------------
Index Scan using clstr_expression_minus_a on clstr_expression
Index Cond: ((- a) = '-3'::integer)
(2 rows)
SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
id | a | b
-----+---+-----------
129 | 3 | prefix129
3 | 3 | prefix3
45 | 3 | prefix45
87 | 3 | prefix87
(4 rows)
COMMIT;
-- and after clustering on clstr_expression_minus_a
CLUSTER clstr_expression USING clstr_expression_minus_a;
WITH rows AS
(SELECT ctid, lag(a) OVER (ORDER BY ctid) AS la, a FROM clstr_expression)
SELECT * FROM rows WHERE la < a;
ctid | la | a
------+----+---
(0 rows)
BEGIN;
SET LOCAL enable_seqscan = false;
EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
QUERY PLAN
---------------------------------------------------------------
Index Scan using clstr_expression_upper_b on clstr_expression
Index Cond: (upper(b) = 'PREFIX3'::text)
(2 rows)
SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
id | a | b
----+---+---------
3 | 3 | prefix3
(1 row)
EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
QUERY PLAN
---------------------------------------------------------------
Index Scan using clstr_expression_minus_a on clstr_expression
Index Cond: ((- a) = '-3'::integer)
(2 rows)
SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
id | a | b
-----+---+-----------
129 | 3 | prefix129
3 | 3 | prefix3
45 | 3 | prefix45
87 | 3 | prefix87
(4 rows)
COMMIT;
-- and after clustering on clstr_expression_upper_b
CLUSTER clstr_expression USING clstr_expression_upper_b;
WITH rows AS
(SELECT ctid, lag(b) OVER (ORDER BY ctid) AS lb, b FROM clstr_expression)
SELECT * FROM rows WHERE upper(lb) > upper(b);
ctid | lb | b
------+----+---
(0 rows)
BEGIN;
SET LOCAL enable_seqscan = false;
EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
QUERY PLAN
---------------------------------------------------------------
Index Scan using clstr_expression_upper_b on clstr_expression
Index Cond: (upper(b) = 'PREFIX3'::text)
(2 rows)
SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
id | a | b
----+---+---------
3 | 3 | prefix3
(1 row)
EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
QUERY PLAN
---------------------------------------------------------------
Index Scan using clstr_expression_minus_a on clstr_expression
Index Cond: ((- a) = '-3'::integer)
(2 rows)
SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
id | a | b
-----+---+-----------
129 | 3 | prefix129
3 | 3 | prefix3
45 | 3 | prefix45
87 | 3 | prefix87
(4 rows)
COMMIT;
-- clean up
DROP TABLE clustertest;
DROP TABLE clstr_1;
DROP TABLE clstr_2;
DROP TABLE clstr_3;
DROP TABLE clstr_4;
DROP TABLE clstr_expression;
DROP USER regress_clstr_user;
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