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https://github.com/timescale/timescaledb.git
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45a7abc4de
Allow pushdown of RelabelType expressions into the scan below the DecompressChunk node. When using varchar columns as segmentby columns constraints on those columns would not be pushed down because postgres would inject RelabelType nodes that where not accepted as valid expression for pushdown leading to bad performance because the filter could only be applied after decompression. Fixes #3351
122 lines
4.3 KiB
SQL
122 lines
4.3 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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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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