| blob | a13aafff0b69e992a0e8703163541b9b2f3d90b6 |
1 --
2 -- CLUSTER
3 --
4 CREATE TABLE clstr_tst_s (rf_a SERIAL PRIMARY KEY,
5 b INT);
6 CREATE TABLE clstr_tst (a SERIAL PRIMARY KEY,
7 b INT,
8 c TEXT,
9 d TEXT,
10 CONSTRAINT clstr_tst_con FOREIGN KEY (b) REFERENCES clstr_tst_s);
11 CREATE INDEX clstr_tst_b ON clstr_tst (b);
12 CREATE INDEX clstr_tst_c ON clstr_tst (c);
13 CREATE INDEX clstr_tst_c_b ON clstr_tst (c,b);
14 CREATE INDEX clstr_tst_b_c ON clstr_tst (b,c);
15 INSERT INTO clstr_tst_s (b) VALUES (0);
16 INSERT INTO clstr_tst_s (b) SELECT b FROM clstr_tst_s;
17 INSERT INTO clstr_tst_s (b) SELECT b FROM clstr_tst_s;
18 INSERT INTO clstr_tst_s (b) SELECT b FROM clstr_tst_s;
19 INSERT INTO clstr_tst_s (b) SELECT b FROM clstr_tst_s;
20 INSERT INTO clstr_tst_s (b) SELECT b FROM clstr_tst_s;
21 CREATE TABLE clstr_tst_inh () INHERITS (clstr_tst);
22 INSERT INTO clstr_tst (b, c) VALUES (11, 'once');
23 INSERT INTO clstr_tst (b, c) VALUES (10, 'diez');
24 INSERT INTO clstr_tst (b, c) VALUES (31, 'treinta y uno');
25 INSERT INTO clstr_tst (b, c) VALUES (22, 'veintidos');
26 INSERT INTO clstr_tst (b, c) VALUES (3, 'tres');
27 INSERT INTO clstr_tst (b, c) VALUES (20, 'veinte');
28 INSERT INTO clstr_tst (b, c) VALUES (23, 'veintitres');
29 INSERT INTO clstr_tst (b, c) VALUES (21, 'veintiuno');
30 INSERT INTO clstr_tst (b, c) VALUES (4, 'cuatro');
31 INSERT INTO clstr_tst (b, c) VALUES (14, 'catorce');
32 INSERT INTO clstr_tst (b, c) VALUES (2, 'dos');
33 INSERT INTO clstr_tst (b, c) VALUES (18, 'dieciocho');
34 INSERT INTO clstr_tst (b, c) VALUES (27, 'veintisiete');
35 INSERT INTO clstr_tst (b, c) VALUES (25, 'veinticinco');
36 INSERT INTO clstr_tst (b, c) VALUES (13, 'trece');
37 INSERT INTO clstr_tst (b, c) VALUES (28, 'veintiocho');
38 INSERT INTO clstr_tst (b, c) VALUES (32, 'treinta y dos');
39 INSERT INTO clstr_tst (b, c) VALUES (5, 'cinco');
40 INSERT INTO clstr_tst (b, c) VALUES (29, 'veintinueve');
41 INSERT INTO clstr_tst (b, c) VALUES (1, 'uno');
42 INSERT INTO clstr_tst (b, c) VALUES (24, 'veinticuatro');
43 INSERT INTO clstr_tst (b, c) VALUES (30, 'treinta');
44 INSERT INTO clstr_tst (b, c) VALUES (12, 'doce');
45 INSERT INTO clstr_tst (b, c) VALUES (17, 'diecisiete');
46 INSERT INTO clstr_tst (b, c) VALUES (9, 'nueve');
47 INSERT INTO clstr_tst (b, c) VALUES (19, 'diecinueve');
48 INSERT INTO clstr_tst (b, c) VALUES (26, 'veintiseis');
49 INSERT INTO clstr_tst (b, c) VALUES (15, 'quince');
50 INSERT INTO clstr_tst (b, c) VALUES (7, 'siete');
51 INSERT INTO clstr_tst (b, c) VALUES (16, 'dieciseis');
52 INSERT INTO clstr_tst (b, c) VALUES (8, 'ocho');
53 -- This entry is needed to test that TOASTED values are copied correctly.
54 INSERT INTO clstr_tst (b, c, d) VALUES (6, 'seis', repeat('xyzzy', 100000));
55 CLUSTER clstr_tst_c ON clstr_tst;
56 SELECT a,b,c,substring(d for 30), length(d) from clstr_tst;
57 a | b | c | substring | length
58 ----+----+---------------+--------------------------------+--------
59 10 | 14 | catorce | |
60 18 | 5 | cinco | |
61 9 | 4 | cuatro | |
62 26 | 19 | diecinueve | |
63 12 | 18 | dieciocho | |
64 30 | 16 | dieciseis | |
65 24 | 17 | diecisiete | |
66 2 | 10 | diez | |
67 23 | 12 | doce | |
68 11 | 2 | dos | |
69 25 | 9 | nueve | |
70 31 | 8 | ocho | |
71 1 | 11 | once | |
72 28 | 15 | quince | |
73 32 | 6 | seis | xyzzyxyzzyxyzzyxyzzyxyzzyxyzzy | 500000
74 29 | 7 | siete | |
75 15 | 13 | trece | |
76 22 | 30 | treinta | |
77 17 | 32 | treinta y dos | |
78 3 | 31 | treinta y uno | |
79 5 | 3 | tres | |
80 20 | 1 | uno | |
81 6 | 20 | veinte | |
82 14 | 25 | veinticinco | |
83 21 | 24 | veinticuatro | |
84 4 | 22 | veintidos | |
85 19 | 29 | veintinueve | |
86 16 | 28 | veintiocho | |
87 27 | 26 | veintiseis | |
88 13 | 27 | veintisiete | |
89 7 | 23 | veintitres | |
90 8 | 21 | veintiuno | |
91 (32 rows)
93 SELECT a,b,c,substring(d for 30), length(d) from clstr_tst ORDER BY a;
94 a | b | c | substring | length
95 ----+----+---------------+--------------------------------+--------
96 1 | 11 | once | |
97 2 | 10 | diez | |
98 3 | 31 | treinta y uno | |
99 4 | 22 | veintidos | |
100 5 | 3 | tres | |
101 6 | 20 | veinte | |
102 7 | 23 | veintitres | |
103 8 | 21 | veintiuno | |
104 9 | 4 | cuatro | |
105 10 | 14 | catorce | |
106 11 | 2 | dos | |
107 12 | 18 | dieciocho | |
108 13 | 27 | veintisiete | |
109 14 | 25 | veinticinco | |
110 15 | 13 | trece | |
111 16 | 28 | veintiocho | |
112 17 | 32 | treinta y dos | |
113 18 | 5 | cinco | |
114 19 | 29 | veintinueve | |
115 20 | 1 | uno | |
116 21 | 24 | veinticuatro | |
117 22 | 30 | treinta | |
118 23 | 12 | doce | |
119 24 | 17 | diecisiete | |
120 25 | 9 | nueve | |
121 26 | 19 | diecinueve | |
122 27 | 26 | veintiseis | |
123 28 | 15 | quince | |
124 29 | 7 | siete | |
125 30 | 16 | dieciseis | |
126 31 | 8 | ocho | |
127 32 | 6 | seis | xyzzyxyzzyxyzzyxyzzyxyzzyxyzzy | 500000
128 (32 rows)
130 SELECT a,b,c,substring(d for 30), length(d) from clstr_tst ORDER BY b;
131 a | b | c | substring | length
132 ----+----+---------------+--------------------------------+--------
133 20 | 1 | uno | |
134 11 | 2 | dos | |
135 5 | 3 | tres | |
136 9 | 4 | cuatro | |
137 18 | 5 | cinco | |
138 32 | 6 | seis | xyzzyxyzzyxyzzyxyzzyxyzzyxyzzy | 500000
139 29 | 7 | siete | |
140 31 | 8 | ocho | |
141 25 | 9 | nueve | |
142 2 | 10 | diez | |
143 1 | 11 | once | |
144 23 | 12 | doce | |
145 15 | 13 | trece | |
146 10 | 14 | catorce | |
147 28 | 15 | quince | |
148 30 | 16 | dieciseis | |
149 24 | 17 | diecisiete | |
150 12 | 18 | dieciocho | |
151 26 | 19 | diecinueve | |
152 6 | 20 | veinte | |
153 8 | 21 | veintiuno | |
154 4 | 22 | veintidos | |
155 7 | 23 | veintitres | |
156 21 | 24 | veinticuatro | |
157 14 | 25 | veinticinco | |
158 27 | 26 | veintiseis | |
159 13 | 27 | veintisiete | |
160 16 | 28 | veintiocho | |
161 19 | 29 | veintinueve | |
162 22 | 30 | treinta | |
163 3 | 31 | treinta y uno | |
164 17 | 32 | treinta y dos | |
165 (32 rows)
167 SELECT a,b,c,substring(d for 30), length(d) from clstr_tst ORDER BY c;
168 a | b | c | substring | length
169 ----+----+---------------+--------------------------------+--------
170 10 | 14 | catorce | |
171 18 | 5 | cinco | |
172 9 | 4 | cuatro | |
173 26 | 19 | diecinueve | |
174 12 | 18 | dieciocho | |
175 30 | 16 | dieciseis | |
176 24 | 17 | diecisiete | |
177 2 | 10 | diez | |
178 23 | 12 | doce | |
179 11 | 2 | dos | |
180 25 | 9 | nueve | |
181 31 | 8 | ocho | |
182 1 | 11 | once | |
183 28 | 15 | quince | |
184 32 | 6 | seis | xyzzyxyzzyxyzzyxyzzyxyzzyxyzzy | 500000
185 29 | 7 | siete | |
186 15 | 13 | trece | |
187 22 | 30 | treinta | |
188 17 | 32 | treinta y dos | |
189 3 | 31 | treinta y uno | |
190 5 | 3 | tres | |
191 20 | 1 | uno | |
192 6 | 20 | veinte | |
193 14 | 25 | veinticinco | |
194 21 | 24 | veinticuatro | |
195 4 | 22 | veintidos | |
196 19 | 29 | veintinueve | |
197 16 | 28 | veintiocho | |
198 27 | 26 | veintiseis | |
199 13 | 27 | veintisiete | |
200 7 | 23 | veintitres | |
201 8 | 21 | veintiuno | |
202 (32 rows)
204 -- Verify that inheritance link still works
205 INSERT INTO clstr_tst_inh VALUES (0, 100, 'in child table');
206 SELECT a,b,c,substring(d for 30), length(d) from clstr_tst;
207 a | b | c | substring | length
208 ----+-----+----------------+--------------------------------+--------
209 10 | 14 | catorce | |
210 18 | 5 | cinco | |
211 9 | 4 | cuatro | |
212 26 | 19 | diecinueve | |
213 12 | 18 | dieciocho | |
214 30 | 16 | dieciseis | |
215 24 | 17 | diecisiete | |
216 2 | 10 | diez | |
217 23 | 12 | doce | |
218 11 | 2 | dos | |
219 25 | 9 | nueve | |
220 31 | 8 | ocho | |
221 1 | 11 | once | |
222 28 | 15 | quince | |
223 32 | 6 | seis | xyzzyxyzzyxyzzyxyzzyxyzzyxyzzy | 500000
224 29 | 7 | siete | |
225 15 | 13 | trece | |
226 22 | 30 | treinta | |
227 17 | 32 | treinta y dos | |
228 3 | 31 | treinta y uno | |
229 5 | 3 | tres | |
230 20 | 1 | uno | |
231 6 | 20 | veinte | |
232 14 | 25 | veinticinco | |
233 21 | 24 | veinticuatro | |
234 4 | 22 | veintidos | |
235 19 | 29 | veintinueve | |
236 16 | 28 | veintiocho | |
237 27 | 26 | veintiseis | |
238 13 | 27 | veintisiete | |
239 7 | 23 | veintitres | |
240 8 | 21 | veintiuno | |
241 0 | 100 | in child table | |
242 (33 rows)
244 -- Verify that foreign key link still works
245 INSERT INTO clstr_tst (b, c) VALUES (1111, 'this should fail');
246 ERROR: insert or update on table "clstr_tst" violates foreign key constraint "clstr_tst_con"
247 DETAIL: Key (b)=(1111) is not present in table "clstr_tst_s".
248 SELECT conname FROM pg_constraint WHERE conrelid = 'clstr_tst'::regclass
249 ORDER BY 1;
250 conname
251 ----------------
252 clstr_tst_con
253 clstr_tst_pkey
254 (2 rows)
256 SELECT relname, relkind,
257 EXISTS(SELECT 1 FROM pg_class WHERE oid = c.reltoastrelid) AS hastoast
258 FROM pg_class c WHERE relname LIKE 'clstr_tst%' ORDER BY relname;
259 relname | relkind | hastoast
260 ----------------------+---------+----------
261 clstr_tst | r | t
262 clstr_tst_a_seq | S | f
263 clstr_tst_b | i | f
264 clstr_tst_b_c | i | f
265 clstr_tst_c | i | f
266 clstr_tst_c_b | i | f
267 clstr_tst_inh | r | t
268 clstr_tst_pkey | i | f
269 clstr_tst_s | r | f
270 clstr_tst_s_pkey | i | f
271 clstr_tst_s_rf_a_seq | S | f
272 (11 rows)
274 -- Verify that indisclustered is correctly set
275 SELECT pg_class.relname FROM pg_index, pg_class, pg_class AS pg_class_2
276 WHERE pg_class.oid=indexrelid
277 AND indrelid=pg_class_2.oid
278 AND pg_class_2.relname = 'clstr_tst'
279 AND indisclustered;
280 relname
281 -------------
282 clstr_tst_c
283 (1 row)
285 -- Try changing indisclustered
286 ALTER TABLE clstr_tst CLUSTER ON clstr_tst_b_c;
287 SELECT pg_class.relname FROM pg_index, pg_class, pg_class AS pg_class_2
288 WHERE pg_class.oid=indexrelid
289 AND indrelid=pg_class_2.oid
290 AND pg_class_2.relname = 'clstr_tst'
291 AND indisclustered;
292 relname
293 ---------------
294 clstr_tst_b_c
295 (1 row)
297 -- Try turning off all clustering
298 ALTER TABLE clstr_tst SET WITHOUT CLUSTER;
299 SELECT pg_class.relname FROM pg_index, pg_class, pg_class AS pg_class_2
300 WHERE pg_class.oid=indexrelid
301 AND indrelid=pg_class_2.oid
302 AND pg_class_2.relname = 'clstr_tst'
303 AND indisclustered;
304 relname
305 ---------
306 (0 rows)
308 -- Verify that toast tables are clusterable
309 CLUSTER pg_toast.pg_toast_826 USING pg_toast_826_index;
310 -- Verify that clustering all tables does in fact cluster the right ones
311 CREATE USER regress_clstr_user;
312 CREATE TABLE clstr_1 (a INT PRIMARY KEY);
313 CREATE TABLE clstr_2 (a INT PRIMARY KEY);
314 CREATE TABLE clstr_3 (a INT PRIMARY KEY);
315 ALTER TABLE clstr_1 OWNER TO regress_clstr_user;
316 ALTER TABLE clstr_3 OWNER TO regress_clstr_user;
317 GRANT SELECT ON clstr_2 TO regress_clstr_user;
318 INSERT INTO clstr_1 VALUES (2);
319 INSERT INTO clstr_1 VALUES (1);
320 INSERT INTO clstr_2 VALUES (2);
321 INSERT INTO clstr_2 VALUES (1);
322 INSERT INTO clstr_3 VALUES (2);
323 INSERT INTO clstr_3 VALUES (1);
324 -- "CLUSTER <tablename>" on a table that hasn't been clustered
325 CLUSTER clstr_2;
326 ERROR: there is no previously clustered index for table "clstr_2"
327 CLUSTER clstr_1_pkey ON clstr_1;
328 CLUSTER clstr_2 USING clstr_2_pkey;
329 SELECT * FROM clstr_1 UNION ALL
330 SELECT * FROM clstr_2 UNION ALL
331 SELECT * FROM clstr_3;
332 a
333 ---
334 1
335 2
336 1
337 2
338 2
339 1
340 (6 rows)
342 -- revert to the original state
343 DELETE FROM clstr_1;
344 DELETE FROM clstr_2;
345 DELETE FROM clstr_3;
346 INSERT INTO clstr_1 VALUES (2);
347 INSERT INTO clstr_1 VALUES (1);
348 INSERT INTO clstr_2 VALUES (2);
349 INSERT INTO clstr_2 VALUES (1);
350 INSERT INTO clstr_3 VALUES (2);
351 INSERT INTO clstr_3 VALUES (1);
352 -- this user can only cluster clstr_1 and clstr_3, but the latter
353 -- has not been clustered
354 SET SESSION AUTHORIZATION regress_clstr_user;
355 SET client_min_messages = ERROR; -- order of "skipping" warnings may vary
356 CLUSTER;
357 RESET client_min_messages;
358 SELECT * FROM clstr_1 UNION ALL
359 SELECT * FROM clstr_2 UNION ALL
360 SELECT * FROM clstr_3;
361 a
362 ---
363 1
364 2
365 2
366 1
367 2
368 1
369 (6 rows)
371 -- cluster a single table using the indisclustered bit previously set
372 DELETE FROM clstr_1;
373 INSERT INTO clstr_1 VALUES (2);
374 INSERT INTO clstr_1 VALUES (1);
375 CLUSTER clstr_1;
376 SELECT * FROM clstr_1;
377 a
378 ---
379 1
380 2
381 (2 rows)
383 -- Test MVCC-safety of cluster. There isn't much we can do to verify the
384 -- results with a single backend...
385 CREATE TABLE clustertest (key int PRIMARY KEY);
386 INSERT INTO clustertest VALUES (10);
387 INSERT INTO clustertest VALUES (20);
388 INSERT INTO clustertest VALUES (30);
389 INSERT INTO clustertest VALUES (40);
390 INSERT INTO clustertest VALUES (50);
391 -- Use a transaction so that updates are not committed when CLUSTER sees 'em
392 BEGIN;
393 -- Test update where the old row version is found first in the scan
394 UPDATE clustertest SET key = 100 WHERE key = 10;
395 -- Test update where the new row version is found first in the scan
396 UPDATE clustertest SET key = 35 WHERE key = 40;
397 -- Test longer update chain
398 UPDATE clustertest SET key = 60 WHERE key = 50;
399 UPDATE clustertest SET key = 70 WHERE key = 60;
400 UPDATE clustertest SET key = 80 WHERE key = 70;
401 SELECT * FROM clustertest;
402 key
403 -----
404 20
405 30
406 100
407 35
408 80
409 (5 rows)
411 CLUSTER clustertest_pkey ON clustertest;
412 SELECT * FROM clustertest;
413 key
414 -----
415 20
416 30
417 35
418 80
419 100
420 (5 rows)
422 COMMIT;
423 SELECT * FROM clustertest;
424 key
425 -----
426 20
427 30
428 35
429 80
430 100
431 (5 rows)
433 -- check that temp tables can be clustered
434 create temp table clstr_temp (col1 int primary key, col2 text);
435 insert into clstr_temp values (2, 'two'), (1, 'one');
436 cluster clstr_temp using clstr_temp_pkey;
437 select * from clstr_temp;
438 col1 | col2
439 ------+------
440 1 | one
441 2 | two
442 (2 rows)
444 drop table clstr_temp;
445 RESET SESSION AUTHORIZATION;
446 -- check clustering an empty table
447 DROP TABLE clustertest;
448 CREATE TABLE clustertest (f1 int PRIMARY KEY);
449 CLUSTER clustertest USING clustertest_pkey;
450 CLUSTER clustertest;
451 -- Check that partitioned tables can be clustered
452 CREATE TABLE clstrpart (a int) PARTITION BY RANGE (a);
453 CREATE TABLE clstrpart1 PARTITION OF clstrpart FOR VALUES FROM (1) TO (10) PARTITION BY RANGE (a);
454 CREATE TABLE clstrpart11 PARTITION OF clstrpart1 FOR VALUES FROM (1) TO (5);
455 CREATE TABLE clstrpart12 PARTITION OF clstrpart1 FOR VALUES FROM (5) TO (10) PARTITION BY RANGE (a);
456 CREATE TABLE clstrpart2 PARTITION OF clstrpart FOR VALUES FROM (10) TO (20);
457 CREATE TABLE clstrpart3 PARTITION OF clstrpart DEFAULT PARTITION BY RANGE (a);
458 CREATE TABLE clstrpart33 PARTITION OF clstrpart3 DEFAULT;
459 CREATE INDEX clstrpart_only_idx ON ONLY clstrpart (a);
460 CLUSTER clstrpart USING clstrpart_only_idx; -- fails
461 ERROR: cannot cluster on invalid index "clstrpart_only_idx"
462 DROP INDEX clstrpart_only_idx;
463 CREATE INDEX clstrpart_idx ON clstrpart (a);
464 -- Check that clustering sets new relfilenodes:
465 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 ;
466 CLUSTER clstrpart USING clstrpart_idx;
467 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 ;
468 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";
469 relname | level | relkind | ?column?
470 -------------+-------+---------+----------
471 clstrpart | 0 | p | t
472 clstrpart1 | 1 | p | t
473 clstrpart11 | 2 | r | f
474 clstrpart12 | 2 | p | t
475 clstrpart2 | 1 | r | f
476 clstrpart3 | 1 | p | t
477 clstrpart33 | 2 | r | f
478 (7 rows)
480 -- Partitioned indexes aren't and can't be marked un/clustered:
481 \d clstrpart
482 Partitioned table "public.clstrpart"
483 Column | Type | Collation | Nullable | Default
484 --------+---------+-----------+----------+---------
485 a | integer | | |
486 Partition key: RANGE (a)
487 Indexes:
488 "clstrpart_idx" btree (a)
489 Number of partitions: 3 (Use \d+ to list them.)
491 CLUSTER clstrpart;
492 ERROR: there is no previously clustered index for table "clstrpart"
493 ALTER TABLE clstrpart SET WITHOUT CLUSTER;
494 ERROR: cannot mark index clustered in partitioned table
495 ALTER TABLE clstrpart CLUSTER ON clstrpart_idx;
496 ERROR: cannot mark index clustered in partitioned table
497 DROP TABLE clstrpart;
498 -- Ownership of partitions is checked
499 CREATE TABLE ptnowner(i int unique) PARTITION BY LIST (i);
500 CREATE INDEX ptnowner_i_idx ON ptnowner(i);
501 CREATE TABLE ptnowner1 PARTITION OF ptnowner FOR VALUES IN (1);
502 CREATE ROLE regress_ptnowner;
503 CREATE TABLE ptnowner2 PARTITION OF ptnowner FOR VALUES IN (2);
504 ALTER TABLE ptnowner1 OWNER TO regress_ptnowner;
505 SET SESSION AUTHORIZATION regress_ptnowner;
506 CLUSTER ptnowner USING ptnowner_i_idx;
507 ERROR: permission denied for table ptnowner
508 RESET SESSION AUTHORIZATION;
509 ALTER TABLE ptnowner OWNER TO regress_ptnowner;
510 CREATE TEMP TABLE ptnowner_oldnodes AS
511 SELECT oid, relname, relfilenode FROM pg_partition_tree('ptnowner') AS tree
512 JOIN pg_class AS c ON c.oid=tree.relid;
513 SET SESSION AUTHORIZATION regress_ptnowner;
514 CLUSTER ptnowner USING ptnowner_i_idx;
515 WARNING: permission denied to cluster "ptnowner2", skipping it
516 RESET SESSION AUTHORIZATION;
517 SELECT a.relname, a.relfilenode=b.relfilenode FROM pg_class a
518 JOIN ptnowner_oldnodes b USING (oid) ORDER BY a.relname COLLATE "C";
519 relname | ?column?
520 -----------+----------
521 ptnowner | t
522 ptnowner1 | f
523 ptnowner2 | t
524 (3 rows)
526 DROP TABLE ptnowner;
527 DROP ROLE regress_ptnowner;
528 -- Test CLUSTER with external tuplesorting
529 create table clstr_4 as select * from tenk1;
530 create index cluster_sort on clstr_4 (hundred, thousand, tenthous);
531 -- ensure we don't use the index in CLUSTER nor the checking SELECTs
532 set enable_indexscan = off;
533 -- Use external sort:
534 set maintenance_work_mem = '1MB';
535 cluster clstr_4 using cluster_sort;
536 select * from
537 (select hundred, lag(hundred) over () as lhundred,
538 thousand, lag(thousand) over () as lthousand,
539 tenthous, lag(tenthous) over () as ltenthous from clstr_4) ss
540 where row(hundred, thousand, tenthous) <= row(lhundred, lthousand, ltenthous);
541 hundred | lhundred | thousand | lthousand | tenthous | ltenthous
542 ---------+----------+----------+-----------+----------+-----------
543 (0 rows)
545 reset enable_indexscan;
546 reset maintenance_work_mem;
547 -- test CLUSTER on expression index
548 CREATE TABLE clstr_expression(id serial primary key, a int, b text COLLATE "C");
549 INSERT INTO clstr_expression(a, b) SELECT g.i % 42, 'prefix'||g.i FROM generate_series(1, 133) g(i);
550 CREATE INDEX clstr_expression_minus_a ON clstr_expression ((-a), b);
551 CREATE INDEX clstr_expression_upper_b ON clstr_expression ((upper(b)));
552 -- verify indexes work before cluster
553 BEGIN;
554 SET LOCAL enable_seqscan = false;
555 EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
556 QUERY PLAN
557 ---------------------------------------------------------------
558 Index Scan using clstr_expression_upper_b on clstr_expression
559 Index Cond: (upper(b) = 'PREFIX3'::text)
560 (2 rows)
562 SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
563 id | a | b
564 ----+---+---------
565 3 | 3 | prefix3
566 (1 row)
568 EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
569 QUERY PLAN
570 ---------------------------------------------------------------
571 Index Scan using clstr_expression_minus_a on clstr_expression
572 Index Cond: ((- a) = '-3'::integer)
573 (2 rows)
575 SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
576 id | a | b
577 -----+---+-----------
578 129 | 3 | prefix129
579 3 | 3 | prefix3
580 45 | 3 | prefix45
581 87 | 3 | prefix87
582 (4 rows)
584 COMMIT;
585 -- and after clustering on clstr_expression_minus_a
586 CLUSTER clstr_expression USING clstr_expression_minus_a;
587 WITH rows AS
588 (SELECT ctid, lag(a) OVER (ORDER BY ctid) AS la, a FROM clstr_expression)
589 SELECT * FROM rows WHERE la < a;
590 ctid | la | a
591 ------+----+---
592 (0 rows)
594 BEGIN;
595 SET LOCAL enable_seqscan = false;
596 EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
597 QUERY PLAN
598 ---------------------------------------------------------------
599 Index Scan using clstr_expression_upper_b on clstr_expression
600 Index Cond: (upper(b) = 'PREFIX3'::text)
601 (2 rows)
603 SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
604 id | a | b
605 ----+---+---------
606 3 | 3 | prefix3
607 (1 row)
609 EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
610 QUERY PLAN
611 ---------------------------------------------------------------
612 Index Scan using clstr_expression_minus_a on clstr_expression
613 Index Cond: ((- a) = '-3'::integer)
614 (2 rows)
616 SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
617 id | a | b
618 -----+---+-----------
619 129 | 3 | prefix129
620 3 | 3 | prefix3
621 45 | 3 | prefix45
622 87 | 3 | prefix87
623 (4 rows)
625 COMMIT;
626 -- and after clustering on clstr_expression_upper_b
627 CLUSTER clstr_expression USING clstr_expression_upper_b;
628 WITH rows AS
629 (SELECT ctid, lag(b) OVER (ORDER BY ctid) AS lb, b FROM clstr_expression)
630 SELECT * FROM rows WHERE upper(lb) > upper(b);
631 ctid | lb | b
632 ------+----+---
633 (0 rows)
635 BEGIN;
636 SET LOCAL enable_seqscan = false;
637 EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
638 QUERY PLAN
639 ---------------------------------------------------------------
640 Index Scan using clstr_expression_upper_b on clstr_expression
641 Index Cond: (upper(b) = 'PREFIX3'::text)
642 (2 rows)
644 SELECT * FROM clstr_expression WHERE upper(b) = 'PREFIX3';
645 id | a | b
646 ----+---+---------
647 3 | 3 | prefix3
648 (1 row)
650 EXPLAIN (COSTS OFF) SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
651 QUERY PLAN
652 ---------------------------------------------------------------
653 Index Scan using clstr_expression_minus_a on clstr_expression
654 Index Cond: ((- a) = '-3'::integer)
655 (2 rows)
657 SELECT * FROM clstr_expression WHERE -a = -3 ORDER BY -a, b;
658 id | a | b
659 -----+---+-----------
660 129 | 3 | prefix129
661 3 | 3 | prefix3
662 45 | 3 | prefix45
663 87 | 3 | prefix87
664 (4 rows)
666 COMMIT;
667 -- clean up
668 DROP TABLE clustertest;
669 DROP TABLE clstr_1;
670 DROP TABLE clstr_2;
671 DROP TABLE clstr_3;
672 DROP TABLE clstr_4;
673 DROP TABLE clstr_expression;
674 DROP USER regress_clstr_user;