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e93b5fa657
The initial approach to mark EquivalenceMember as derived had some loopholes still leading to infinite recursion with certain join conditions.
44 lines
1.6 KiB
SQL
44 lines
1.6 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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-- disable memoize on PG14+
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SELECT CASE WHEN current_setting('server_version_num')::int/10000 >= 14 THEN set_config('enable_memoize','off',false) ELSE 'off' END AS enable_memoize;
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SET enable_indexscan TO false;
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-- test join on compressed time column
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-- #3079, #4465
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CREATE TABLE compressed_join_temp AS SELECT * FROM metrics ORDER BY time DESC LIMIT 10;
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ANALYZE compressed_join_temp;
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EXPLAIN (analyze,costs off,timing off,summary off) SELECT *
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FROM compressed_join_temp t
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INNER JOIN metrics_compressed m ON t.time = m.time AND t.device_id = m.device_id
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LIMIT 1;
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DROP TABLE compressed_join_temp;
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-- test join with partially compressed chunks
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CREATE TABLE partial_join(time timestamptz,device text);
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SELECT table_name FROM create_hypertable('partial_join','time');
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ALTER TABLE partial_join set(timescaledb.compress,timescaledb.compress_segmentby='device');
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INSERT INTO partial_join SELECT '2000-01-01','d1';
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SELECT count(*) FROM (SELECT compress_chunk(show_chunks('partial_join'),true)) compress;
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-- make chunk partially compressed
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INSERT INTO partial_join SELECT '2000-01-01','d1';
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SELECT * FROM partial_join m1 INNER JOIN partial_join m2 ON m1.device = m2.device;
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DROP TABLE partial_join;
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-- This resulted in a recursion in the join planner code on PG16
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SELECT * FROM metrics_tstz as m
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INNER JOIN metrics_space as ms on (true)
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INNER JOIN metrics_space_compressed as msc on (true)
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WHERE CASE WHEN m.device_id is not NULL and ms.v2 is not NULL THEN NULL::int2 end = msc.device_id;
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