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https://github.com/timescale/timescaledb.git
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fb0df1ae4e
If there any indexes on the compressed chunk, insert into them while inserting the heap data rather than reindexing the relation at the end. This reduces the amount of locking on the compressed chunk indexes which created issues when merging chunks and should help with the future updates of compressed data.
77 lines
1.8 KiB
SQL
77 lines
1.8 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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\c :TEST_DBNAME :ROLE_SUPERUSER
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-- github issue 5585
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create table test (
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time timestamptz not null,
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a varchar(255) not null,
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b int,
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c int
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);
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SELECT create_hypertable('test', 'time');
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insert into test values
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('2020-01-01 00:00'::timestamptz, 'lat', 1, 2),
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('2020-01-01 00:01'::timestamptz, 'lat', 1, 2),
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('2020-01-01 00:01'::timestamptz, 'lat', 2, 2),
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('2020-01-01 00:03'::timestamptz, 'lat', 1, 2),
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('2020-01-01 00:01'::timestamptz, 'lon', 1, 2);
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create table test_copy as select * from test;
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-- compress the chunk
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alter table test set (timescaledb.compress, timescaledb.compress_segmentby='a, b');
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select compress_chunk(show_chunks('test'));
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-- force an index scan
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set enable_seqscan = 'off';
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-- disable jit to avoid test flakiness
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set jit = off;
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explain (costs off) with query_params as (
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select distinct a, b
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from test_copy
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where test_copy.a IN ('lat', 'lon')
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and test_copy.b IN (1)
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)
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select
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test.time,
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test.a = q.a as "this should never be false",
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test.a,
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test.b,
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test.c,
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q.*
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from
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test inner join query_params q
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on q.a = test.a and q.b = test.b
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where test.time between '2020-01-01 00:00' and '2020-01-01 00:02'
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order by test.time;
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with query_params as (
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select distinct a, b
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from test_copy
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where test_copy.a IN ('lat', 'lon')
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and test_copy.b IN (1)
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)
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select
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test.time,
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test.a = q.a as "this should never be false",
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test.a,
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test.b,
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test.c,
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q.*
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from
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test inner join query_params q
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on q.a = test.a and q.b = test.b
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where test.time between '2020-01-01 00:00' and '2020-01-01 00:02'
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order by test.time;
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reset enable_seqscan;
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reset jit;
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drop table test;
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drop table test_copy;
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