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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.
93 lines
3.8 KiB
SQL
93 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 parallel cost to zero to force parallel plans and avoid flaky test.
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set parallel_tuple_cost to 0;
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set parallel_setup_cost to 0;
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-- We need to drop the index to trigger parallel plans. Otherwise they
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-- will use the index.
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drop index hypertable_device_id_idx;
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-- Show parallel plan and count on uncompressed (non-hypercore)
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-- hypertable
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set max_parallel_workers_per_gather=2;
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select explain_anonymize(format($$
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select device_id, count(*) from %s where device_id=1 group by device_id
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$$, :'hypertable'));
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select device_id, count(*) from :hypertable where device_id=1 group by device_id;
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-- Save counts collected over entire hypertable
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select device_id, count(*) into orig from :hypertable group by device_id;
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-- Save counts over a single chunk
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select device_id, count(*) into orig_chunk from :chunk1 group by device_id;
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-----------------------
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-- Enable hypercore --
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-----------------------
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select compress_chunk(show_chunks(:'hypertable'), hypercore_use_access_method => true);
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-- Show count without parallel plan and without ColumnarScan
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set timescaledb.enable_columnarscan=false;
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set max_parallel_workers_per_gather=0;
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select explain_anonymize(format($$
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select device_id, count(*) from %s where device_id=1 group by device_id
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$$, :'hypertable'));
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select device_id, count(*) from :hypertable where device_id=1 group by device_id;
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-- Filter on segmentby column
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select explain_anonymize(format($$
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select owner_id, count(*) from %s where owner_id=1 group by owner_id
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$$, :'hypertable'));
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select owner_id, count(*) from :hypertable where owner_id=1 group by owner_id;
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-- Enable parallel on SeqScan and check for same result
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set max_parallel_workers_per_gather=2;
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select explain_anonymize(format($$
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select device_id, count(*) from %s where device_id=1 group by device_id
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$$, :'hypertable'));
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select device_id, count(*) from :hypertable where device_id=1 group by device_id;
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select explain_anonymize(format($$
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select owner_id, count(*) from %s where owner_id=1 group by owner_id
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$$, :'hypertable'));
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select owner_id, count(*) from :hypertable where owner_id=1 group by owner_id;
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-- Enable ColumnarScan and check for same result
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set timescaledb.enable_columnarscan=true;
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select explain_anonymize(format($$
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select device_id, count(*) from %s where device_id=1 group by device_id
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$$, :'hypertable'));
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select device_id, count(*) from :hypertable where device_id=1 group by device_id;
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-- Filter on segmentby column (pushing down scankeys in parallel mode)
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select explain_anonymize(format($$
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select owner_id, count(*) from %s where owner_id=1 group by owner_id
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$$, :'hypertable'));
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select owner_id, count(*) from :hypertable where owner_id=1 group by owner_id;
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-- Parallel plan with hypercore on single chunk
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select explain_anonymize(format($$
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select device_id, count(*) from %s where device_id=1 group by device_id
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$$, :'hypertable'));
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select device_id, count(*) from :chunk1 where device_id=1 group by device_id;
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select explain_anonymize(format($$
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select owner_id, count(*) from %s where owner_id=1 group by owner_id
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$$, :'hypertable'));
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select owner_id, count(*) from :chunk1 where owner_id=1 group by owner_id;
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-- Compare hypercore per-location counts with original counts without
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-- hypercore
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select device_id, count(*) into comp from :hypertable group by device_id;
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select * from orig join comp using (device_id) where orig.count != comp.count;
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-- Compare counts on single chunk
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select device_id, count(*) into comp_chunk from :chunk1 group by device_id;
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select * from orig_chunk join comp_chunk using (device_id) where orig_chunk.count != comp_chunk.count;
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