-- This file and its contents are licensed under the Apache License 2.0.
-- Please see the included NOTICE for copyright information and
-- LICENSE-APACHE for a copy of the license.
CREATE TABLE cluster_test(time timestamptz, temp float, location int);
SELECT create_hypertable('cluster_test', 'time', chunk_time_interval => interval '1 day');
NOTICE:  adding not-null constraint to column "time"
     create_hypertable     
---------------------------
 (1,public,cluster_test,t)
(1 row)

-- Show default indexes
SELECT * FROM test.show_indexes('cluster_test');
         Index         | Columns | Expr | Unique | Primary | Exclusion | Tablespace 
-----------------------+---------+------+--------+---------+-----------+------------
 cluster_test_time_idx | {time}  |      | f      | f       | f         | 
(1 row)

-- Create two chunks
INSERT INTO cluster_test VALUES ('2017-01-20T09:00:01', 23.4, 1),
       ('2017-01-21T09:00:01', 21.3, 2);
-- Run cluster
CLUSTER VERBOSE cluster_test USING cluster_test_time_idx;
INFO:  clustering "_timescaledb_internal._hyper_1_2_chunk" using index scan on "_hyper_1_2_chunk_cluster_test_time_idx"
INFO:  "_hyper_1_2_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
INFO:  clustering "_timescaledb_internal._hyper_1_1_chunk" using index scan on "_hyper_1_1_chunk_cluster_test_time_idx"
INFO:  "_hyper_1_1_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
-- Create a third chunk
INSERT INTO cluster_test VALUES ('2017-01-22T09:00:01', 19.5, 3);
-- Show clustered indexes
SELECT indexrelid::regclass, indisclustered
FROM pg_index
WHERE indisclustered = true ORDER BY 1;
                          indexrelid                          | indisclustered 
--------------------------------------------------------------+----------------
 cluster_test_time_idx                                        | t
 _timescaledb_internal._hyper_1_1_chunk_cluster_test_time_idx | t
 _timescaledb_internal._hyper_1_2_chunk_cluster_test_time_idx | t
(3 rows)

-- Reorder just our table
CLUSTER VERBOSE cluster_test;
INFO:  clustering "_timescaledb_internal._hyper_1_3_chunk" using index scan on "_hyper_1_3_chunk_cluster_test_time_idx"
INFO:  "_hyper_1_3_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
INFO:  clustering "_timescaledb_internal._hyper_1_2_chunk" using sequential scan and sort
INFO:  "_hyper_1_2_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
INFO:  clustering "_timescaledb_internal._hyper_1_1_chunk" using sequential scan and sort
INFO:  "_hyper_1_1_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
-- Show clustered indexes, including new chunk
SELECT indexrelid::regclass, indisclustered
FROM pg_index
WHERE indisclustered = true ORDER BY 1;
                          indexrelid                          | indisclustered 
--------------------------------------------------------------+----------------
 cluster_test_time_idx                                        | t
 _timescaledb_internal._hyper_1_1_chunk_cluster_test_time_idx | t
 _timescaledb_internal._hyper_1_2_chunk_cluster_test_time_idx | t
 _timescaledb_internal._hyper_1_3_chunk_cluster_test_time_idx | t
(4 rows)

-- Reorder all tables (although will only be our test table)
CLUSTER VERBOSE;
INFO:  clustering "_timescaledb_internal._hyper_1_3_chunk" using sequential scan and sort
INFO:  "_hyper_1_3_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
INFO:  clustering "_timescaledb_internal._hyper_1_1_chunk" using sequential scan and sort
INFO:  "_hyper_1_1_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
INFO:  clustering "_timescaledb_internal._hyper_1_2_chunk" using sequential scan and sort
INFO:  "_hyper_1_2_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
INFO:  clustering "public.cluster_test" using sequential scan and sort
INFO:  "cluster_test": found 0 removable, 0 nonremovable row versions in 0 pages
-- Change the clustered index
CREATE INDEX ON cluster_test (time, location);
CLUSTER VERBOSE cluster_test using cluster_test_time_location_idx;
INFO:  clustering "_timescaledb_internal._hyper_1_3_chunk" using sequential scan and sort
INFO:  "_hyper_1_3_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
INFO:  clustering "_timescaledb_internal._hyper_1_2_chunk" using sequential scan and sort
INFO:  "_hyper_1_2_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
INFO:  clustering "_timescaledb_internal._hyper_1_1_chunk" using sequential scan and sort
INFO:  "_hyper_1_1_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
-- Show updated clustered indexes
SELECT indexrelid::regclass, indisclustered
FROM pg_index
WHERE indisclustered = true ORDER BY 1;
                        indexrelid                        | indisclustered 
----------------------------------------------------------+----------------
 cluster_test_time_location_idx                           | t
 _timescaledb_internal._hyper_1_1_chunk_time_location_idx | t
 _timescaledb_internal._hyper_1_2_chunk_time_location_idx | t
 _timescaledb_internal._hyper_1_3_chunk_time_location_idx | t
(4 rows)

--check the setting of cluster indexes on hypertables and chunks
ALTER TABLE cluster_test CLUSTER ON cluster_test_time_idx;
SELECT indexrelid::regclass, indisclustered
FROM pg_index
WHERE indisclustered = true
ORDER BY 1,2;
                          indexrelid                          | indisclustered 
--------------------------------------------------------------+----------------
 cluster_test_time_idx                                        | t
 _timescaledb_internal._hyper_1_1_chunk_cluster_test_time_idx | t
 _timescaledb_internal._hyper_1_2_chunk_cluster_test_time_idx | t
 _timescaledb_internal._hyper_1_3_chunk_cluster_test_time_idx | t
(4 rows)

CLUSTER VERBOSE cluster_test;
INFO:  clustering "_timescaledb_internal._hyper_1_3_chunk" using sequential scan and sort
INFO:  "_hyper_1_3_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
INFO:  clustering "_timescaledb_internal._hyper_1_2_chunk" using sequential scan and sort
INFO:  "_hyper_1_2_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
INFO:  clustering "_timescaledb_internal._hyper_1_1_chunk" using sequential scan and sort
INFO:  "_hyper_1_1_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
ALTER TABLE cluster_test SET WITHOUT CLUSTER;
SELECT indexrelid::regclass, indisclustered
FROM pg_index
WHERE indisclustered = true
ORDER BY 1,2;
 indexrelid | indisclustered 
------------+----------------
(0 rows)

\set ON_ERROR_STOP 0
CLUSTER VERBOSE cluster_test;
ERROR:  there is no previously clustered index for table "cluster_test"
\set ON_ERROR_STOP 1
ALTER TABLE _timescaledb_internal._hyper_1_1_chunk CLUSTER ON _hyper_1_1_chunk_cluster_test_time_idx;
SELECT indexrelid::regclass, indisclustered
FROM pg_index
WHERE indisclustered = true
ORDER BY 1,2;
                          indexrelid                          | indisclustered 
--------------------------------------------------------------+----------------
 _timescaledb_internal._hyper_1_1_chunk_cluster_test_time_idx | t
(1 row)

CLUSTER VERBOSE _timescaledb_internal._hyper_1_1_chunk;
INFO:  clustering "_timescaledb_internal._hyper_1_1_chunk" using sequential scan and sort
INFO:  "_hyper_1_1_chunk": found 0 removable, 1 nonremovable row versions in 1 pages
ALTER TABLE _timescaledb_internal._hyper_1_1_chunk SET WITHOUT CLUSTER;
SELECT indexrelid::regclass, indisclustered
FROM pg_index
WHERE indisclustered = true
ORDER BY 1,2;
 indexrelid | indisclustered 
------------+----------------
(0 rows)

\set ON_ERROR_STOP 0
CLUSTER VERBOSE _timescaledb_internal._hyper_1_1_chunk;
ERROR:  there is no previously clustered index for table "_hyper_1_1_chunk"
\set ON_ERROR_STOP 1