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8fd4ecbdd9
The SkipScan code assumed IndexPaths on ordered indexes always have pathkeys which is not true when the pathkeys are not useful for the query, leading to a segfault for those queries.
28 lines
1.0 KiB
SQL
28 lines
1.0 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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CREATE INDEX ON :TABLE(dev);
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CREATE INDEX ON :TABLE(time);
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-- SkipScan with ordered append
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:PREFIX SELECT DISTINCT ON (time) time FROM :TABLE ORDER BY time;
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--baseline query with skipscan
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:PREFIX SELECT DISTINCT ON (dev) dev, dev_name FROM :TABLE;
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-- compression doesnt prevent skipscan
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SELECT compress_chunk('_timescaledb_internal._hyper_1_1_chunk');
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:PREFIX SELECT DISTINCT ON (dev) dev, dev_name FROM :TABLE;
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SELECT decompress_chunk('_timescaledb_internal._hyper_1_1_chunk');
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--baseline query with skipscan
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:PREFIX SELECT DISTINCT ON (dev) dev, dev_name FROM :TABLE;
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-- partial indexes don't prevent skipscan
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DROP INDEX _timescaledb_internal._hyper_1_1_chunk_skip_scan_ht_dev_idx;
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:PREFIX SELECT DISTINCT ON (dev) dev, dev_name FROM :TABLE;
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-- IndexPath without pathkeys doesnt use SkipScan
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EXPLAIN (costs off, timing off, summary off) SELECT DISTINCT 1 FROM pg_rewrite;
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