mirror of
https://github.com/timescale/timescaledb.git
synced 2025-05-17 02:53:51 +08:00
122 lines
4.2 KiB
SQL
122 lines
4.2 KiB
SQL
-- This file and its contents are licensed under the Timescale License.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-TIMESCALE for a copy of the license.
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-- qual pushdown tests for decompresschunk ---
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-- Test qual pushdown with ints
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CREATE TABLE meta (device_id INT PRIMARY KEY);
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CREATE TABLE hyper(
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time INT NOT NULL,
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device_id INT REFERENCES meta(device_id) ON DELETE CASCADE ON UPDATE CASCADE,
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val INT);
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SELECT * FROM create_hypertable('hyper', 'time', chunk_time_interval => 10);
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ALTER TABLE hyper SET (
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timescaledb.compress,
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timescaledb.compress_orderby = 'time',
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timescaledb.compress_segmentby = 'device_id');
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INSERT INTO meta VALUES (1), (2), (3), (4), (5);
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INSERT INTO hyper VALUES (1, 1, 1), (2, 2, 1), (3, 3, 1), (10, 3, 2), (11, 4, 2), (11, 5, 2);
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SELECT ch1.table_name AS "CHUNK_NAME", ch1.schema_name|| '.' || ch1.table_name AS "CHUNK_FULL_NAME"
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FROM _timescaledb_catalog.chunk ch1, _timescaledb_catalog.hypertable ht
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WHERE ch1.hypertable_id = ht.id AND ht.table_name LIKE 'hyper'
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ORDER BY ch1.id LIMIT 1 \gset
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SELECT compress_chunk(:'CHUNK_FULL_NAME');
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-- test for qual pushdown
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explain (costs off, verbose)
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SELECT
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FROM hyper
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WHERE time > 2::bigint and time < 4;
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explain (costs off, verbose)
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SELECT
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FROM hyper
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WHERE time = 3::bigint;
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SELECT *
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FROM hyper
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WHERE time > 2::bigint and time < 4;
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SELECT *
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FROM hyper
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WHERE time = 3::bigint;
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--- github issue 1855
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--- TESTs for meta column pushdown filters on exprs with casts.
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CREATE TABLE metaseg_tab (
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fmid smallint,
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factorid smallint,
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start_dt timestamp without time zone,
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end_dt timestamp without time zone,
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interval_number smallint,
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logret double precision,
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knowledge_date date NOT NULL
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);
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SELECT create_hypertable('metaseg_tab', 'end_dt', chunk_time_interval=>interval '1 month', create_default_indexes=>false);
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SELECT add_dimension('metaseg_tab', 'fmid', chunk_time_interval => 1);
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ALTER TABLE metaseg_tab SET (timescaledb.compress, timescaledb.compress_orderby= 'end_dt');
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INSERT INTO metaseg_tab values (56,0,'2012-12-10 09:45:00','2012-12-10 09:50:00',1,0.1,'2012-12-10');
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SELECT compress_chunk(i) from show_chunks('metaseg_tab') i;
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select factorid, end_dt, logret
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from metaseg_tab
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where fmid = 56
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and end_dt between '2012-12-10'::date and '2012-12-11'::date
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order by factorid, end_dt;
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explain (costs off, verbose)
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select factorid, end_dt, logret
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from metaseg_tab
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where fmid = 56
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and end_dt between '2012-12-10'::date and '2012-12-11'::date
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order by factorid, end_dt;
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--no pushdown here
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select factorid, end_dt, logret
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from metaseg_tab
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where fmid = 56
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and end_dt::date between '2012-12-10'::timestamp and '2012-12-11'::date
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order by factorid, end_dt;
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explain (costs off, verbose)
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select factorid, end_dt, logret
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from metaseg_tab
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where fmid = 56
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and end_dt::date between '2012-12-10'::timestamp and '2012-12-11'::date
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order by factorid, end_dt;
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--should fail
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\set ON_ERROR_STOP 0
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select factorid, end_dt, logret
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from metaseg_tab
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where fmid = 56
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and end_dt::date = 10;
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select factorid, end_dt, logret
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from metaseg_tab
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where fmid = 56
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and end_dt::date = 'dec 2010'::date;
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-- test casts between different char types are pushed down
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CREATE TABLE pushdown_relabel(time timestamptz NOT NULL, dev_vc varchar(10), dev_c char(10));
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SELECT table_name FROM create_hypertable('pushdown_relabel', 'time');
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ALTER TABLE pushdown_relabel SET (timescaledb.compress, timescaledb.compress_segmentby='dev_vc,dev_c');
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INSERT INTO pushdown_relabel SELECT '2000-01-01','varchar','char';
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SELECT compress_chunk(i) from show_chunks('pushdown_relabel') i;
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EXPLAIN (costs off) SELECT * FROM pushdown_relabel WHERE dev_vc = 'varchar';
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EXPLAIN (costs off) SELECT * FROM pushdown_relabel WHERE dev_c = 'char';
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EXPLAIN (costs off) SELECT * FROM pushdown_relabel WHERE dev_vc = 'varchar' AND dev_c = 'char';
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EXPLAIN (costs off) SELECT * FROM pushdown_relabel WHERE dev_vc = 'varchar'::char(10) AND dev_c = 'char'::varchar;
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-- test again with index scans
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SET enable_seqscan TO false;
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EXPLAIN (costs off) SELECT * FROM pushdown_relabel WHERE dev_vc = 'varchar';
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EXPLAIN (costs off) SELECT * FROM pushdown_relabel WHERE dev_c = 'char';
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EXPLAIN (costs off) SELECT * FROM pushdown_relabel WHERE dev_vc = 'varchar' AND dev_c = 'char';
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EXPLAIN (costs off) SELECT * FROM pushdown_relabel WHERE dev_vc = 'varchar'::char(10) AND dev_c = 'char'::varchar;
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