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e5e94960d0
Changing from using the `compress_using` parameter with a table access method name to use the boolean parameter `hypercore_use_access_method` instead to avoid having to provide a name when using the table access method for compression.
104 lines
3.8 KiB
SQL
104 lines
3.8 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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\ir include/setup_hypercore.sql
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-- Set the number of parallel workers to zero to disable parallel
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-- plans. This differs between different PG versions.
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set max_parallel_workers_per_gather to 0;
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-- Redefine the indexes to use hash indexes
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drop index hypertable_location_id_idx;
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drop index hypertable_device_id_idx;
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-- Discourage sequence scan when there are alternatives to avoid flaky
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-- tests.
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set enable_seqscan to false;
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create index hypertable_location_id_idx on :hypertable using hash (location_id);
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create index hypertable_device_id_idx on :hypertable using hash (device_id);
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create view chunk_indexes as
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select ch::regclass as chunk, indexrelid::regclass as index, attname
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from pg_attribute att inner join pg_index ind
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on (att.attrelid=ind.indrelid and att.attnum=ind.indkey[0])
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inner join show_chunks(:'hypertable') ch on (ch = att.attrelid)
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order by chunk, index;
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-- save some reference data from an index (only) scan
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select explain_anonymize(format($$
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select location_id, count(*) into orig from %s
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where location_id in (3,4,5) group by location_id
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$$, :'hypertable'));
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select location_id, count(*) into orig from :hypertable
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where location_id in (3,4,5) group by location_id;
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alter table :chunk2 set access method hypercore;
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--
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-- test that indexes work after updates
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--
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-- find a compressed tuple in a deterministic manner and get location and timestamp
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select created_at, location_id
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from :chunk2 where _timescaledb_debug.is_compressed_tid(ctid)
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order by created_at, location_id limit 1 \gset
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select _timescaledb_debug.is_compressed_tid(ctid), *
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from :chunk2 where location_id = :location_id and created_at = :'created_at';
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-- first update moves the value from the compressed rel to the non-compressed (seen via ctid)
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update :hypertable set temp=1.0 where location_id=:location_id and created_at=:'created_at';
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select _timescaledb_debug.is_compressed_tid(ctid), *
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from :chunk2 where location_id = :location_id and created_at = :'created_at';
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-- second update should be a hot update (tuple in same block after update, as shown by ctid)
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update :hypertable set temp=2.0 where location_id=:location_id and created_at=:'created_at';
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select _timescaledb_debug.is_compressed_tid(ctid), *
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from :chunk2 where location_id = :location_id and created_at = :'created_at';
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-- make sure query uses a segmentby index and returns the correct data for the update value
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select explain_anonymize(format($$
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select created_at, location_id, temp from %s where location_id=1 and temp=2.0
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$$, :'chunk2'));
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select created_at, location_id, temp from :chunk2 where location_id=1 and temp=2.0;
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select compress_chunk(show_chunks(:'hypertable'), hypercore_use_access_method => true);
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vacuum analyze :hypertable;
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-- Test index scan on non-segmentby column
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select explain_analyze_anonymize(format($$
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select device_id, avg(temp) from %s where device_id = 10
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group by device_id
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$$, :'hypertable'));
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select explain_analyze_anonymize(format($$
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select device_id, avg(temp) from %s where device_id = 10
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group by device_id
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$$, :'chunk1'));
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-- Test index scan on segmentby column
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select explain_analyze_anonymize(format($$
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select created_at, location_id, temp from %s where location_id = 5
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$$, :'hypertable'));
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select explain_analyze_anonymize(format($$
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select created_at, location_id, temp from %s where location_id = 5
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$$, :'chunk1'));
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-- These should generate decompressions as above, but for all columns.
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select explain_analyze_anonymize(format($$
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select * from %s where location_id = 5
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$$, :'hypertable'));
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select explain_analyze_anonymize(format($$
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select * from %s where location_id = 5
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$$, :'chunk1'));
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drop table :hypertable cascade;
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