mirror of
https://github.com/timescale/timescaledb.git
synced 2025-05-17 19:13:16 +08:00
38 lines
1.4 KiB
SQL
38 lines
1.4 KiB
SQL
-- This file and its contents are licensed under the Timescale License.
|
|
-- Please see the included NOTICE for copyright information and
|
|
-- LICENSE-TIMESCALE for a copy of the license.
|
|
|
|
-- disable memoize on PG14+
|
|
SELECT CASE WHEN current_setting('server_version_num')::int/10000 >= 14 THEN set_config('enable_memoize','off',false) ELSE 'off' END AS enable_memoize;
|
|
SET enable_indexscan TO false;
|
|
|
|
-- test join on compressed time column
|
|
-- #3079, #4465
|
|
CREATE TABLE compressed_join_temp AS SELECT * FROM metrics ORDER BY time DESC LIMIT 10;
|
|
ANALYZE compressed_join_temp;
|
|
|
|
EXPLAIN (analyze,costs off,timing off,summary off) SELECT *
|
|
FROM compressed_join_temp t
|
|
INNER JOIN metrics_compressed m ON t.time = m.time AND t.device_id = m.device_id
|
|
LIMIT 1;
|
|
|
|
DROP TABLE compressed_join_temp;
|
|
|
|
-- test join with partially compressed chunks
|
|
CREATE TABLE partial_join(time timestamptz,device text);
|
|
|
|
SELECT table_name FROM create_hypertable('partial_join','time');
|
|
ALTER TABLE partial_join set(timescaledb.compress,timescaledb.compress_segmentby='device');
|
|
|
|
INSERT INTO partial_join SELECT '2000-01-01','d1';
|
|
|
|
SELECT count(*) FROM (SELECT compress_chunk(show_chunks('partial_join'),true)) compress;
|
|
|
|
-- make chunk partially compressed
|
|
INSERT INTO partial_join SELECT '2000-01-01','d1';
|
|
|
|
SELECT * FROM partial_join m1 INNER JOIN partial_join m2 ON m1.device = m2.device;
|
|
|
|
DROP TABLE partial_join;
|
|
|