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https://github.com/timescale/timescaledb.git
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301612af55
Since all SQLValueFunction are STABLE we can safely push them down into the scan of the compressed chunk. The following expressions are pushed down: - CURRENT_DATE - CURRENT_TIME - CURRENT_TIME(p) - CURRENT_TIMESTAMP - CURRENT_TIMESTAMP(p) - LOCALTIME - LOCALTIME(p) - LOCALTIMESTAMP - LOCALTIMESTAMP(p) - USER - CURRENT_USER - SESSION_USER - CURRENT_CATALOG - CURRENT_SCHEMA
184 lines
7.3 KiB
SQL
184 lines
7.3 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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ANALYZE pushdown_relabel;
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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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-- github issue #5286
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CREATE TABLE deleteme AS
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SELECT generate_series AS timestamp, 1 AS segment, 0 AS data
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FROM generate_series('2008-03-01 00:00'::timestamp with time zone,
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'2008-03-04 12:00', '1 second');
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SELECT create_hypertable('deleteme', 'timestamp', migrate_data => true);
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ALTER TABLE deleteme SET (
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timescaledb.compress,
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timescaledb.compress_segmentby = 'segment'
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);
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SELECT compress_chunk(i) FROM show_chunks('deleteme') i;
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EXPLAIN (costs off) SELECT sum(data) FROM deleteme WHERE segment::text like '%4%';
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EXPLAIN (costs off) SELECT sum(data) FROM deleteme WHERE '4' = segment::text;
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CREATE TABLE deleteme_with_bytea(time bigint NOT NULL, bdata bytea);
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SELECT create_hypertable('deleteme_with_bytea', 'time', chunk_time_interval => 1000000);
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INSERT INTO deleteme_with_bytea(time, bdata) VALUES (1001, E'\\x');
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INSERT INTO deleteme_with_bytea(time, bdata) VALUES (1001, NULL);
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ALTER TABLE deleteme_with_bytea SET (
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timescaledb.compress,
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timescaledb.compress_segmentby = 'bdata'
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);
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SELECT compress_chunk(i) FROM show_chunks('deleteme_with_bytea') i;
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EXPLAIN (costs off) SELECT '1' FROM deleteme_with_bytea WHERE bdata = E'\\x';
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EXPLAIN (costs off) SELECT '1' FROM deleteme_with_bytea WHERE bdata::text = '123';
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DROP table deleteme;
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DROP table deleteme_with_bytea;
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-- test sqlvaluefunction pushdown
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CREATE TABLE svf_pushdown(time timestamptz, c_date date, c_time time, c_timetz timetz, c_timestamp timestamptz, c_name text);
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SELECT table_name FROM create_hypertable('svf_pushdown', 'time');
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ALTER TABLE svf_pushdown SET (timescaledb.compress,timescaledb.compress_segmentby='c_date,c_time, c_timetz,c_timestamp,c_name');
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INSERT INTO svf_pushdown SELECT '2020-01-01';
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SELECT compress_chunk(show_chunks('svf_pushdown'));
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-- constraints should be pushed down into scan below decompresschunk in all cases
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_date = CURRENT_DATE;
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_timetz = CURRENT_TIME;
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_timetz = CURRENT_TIME(1);
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_timestamp = CURRENT_TIMESTAMP;
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_timestamp = CURRENT_TIMESTAMP(1);
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_time = LOCALTIME;
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_time = LOCALTIME(1);
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_timestamp = LOCALTIMESTAMP;
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_timestamp = LOCALTIMESTAMP(1);
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_name = USER;
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_name = CURRENT_USER;
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_name = SESSION_USER;
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_name = CURRENT_CATALOG;
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_name = CURRENT_SCHEMA;
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-- current_query() is not a sqlvaluefunction and volatile so should not be pushed down
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EXPLAIN (costs off) SELECT * FROM svf_pushdown WHERE c_name = current_query();
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