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The btree_gist enum test expects a bitmap heap scan. Sinceb46e1e54d0enabled setting the VM during on-access pruning and378a21618set pd_prune_xid on INSERT, scans of enumtmp may set pages all-visible. If autovacuum or autoanalyze then updates pg_class.relallvisible, the planner could choose an index-only scan instead. Make the enumtmp a temp table to exclude it from autovacuum/autoanalyze. Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Melanie Plageman <melanieplageman@gmail.com> Discussion: https://postgr.es/m/46733d68-aec0-4d09-8120-4c66b87047a4%40gmail.com
42 lines
1.1 KiB
SQL
42 lines
1.1 KiB
SQL
-- enum check
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create type rainbow as enum ('r','o','g','b','i','v');
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-- enum values added later take some different codepaths internally,
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-- so make sure we have coverage for those too
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alter type rainbow add value 'y' before 'g';
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CREATE TEMPORARY TABLE enumtmp (a rainbow);
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\copy enumtmp from 'data/enum.data'
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SET enable_seqscan=on;
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select a, count(*) from enumtmp group by a order by 1;
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SELECT count(*) FROM enumtmp WHERE a < 'g'::rainbow;
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SELECT count(*) FROM enumtmp WHERE a <= 'g'::rainbow;
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SELECT count(*) FROM enumtmp WHERE a = 'g'::rainbow;
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SELECT count(*) FROM enumtmp WHERE a >= 'g'::rainbow;
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SELECT count(*) FROM enumtmp WHERE a > 'g'::rainbow;
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CREATE INDEX enumidx ON enumtmp USING gist ( a );
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SET enable_seqscan=off;
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SELECT count(*) FROM enumtmp WHERE a < 'g'::rainbow;
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SELECT count(*) FROM enumtmp WHERE a <= 'g'::rainbow;
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SELECT count(*) FROM enumtmp WHERE a = 'g'::rainbow;
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SELECT count(*) FROM enumtmp WHERE a >= 'g'::rainbow;
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SELECT count(*) FROM enumtmp WHERE a > 'g'::rainbow;
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EXPLAIN (COSTS OFF)
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SELECT count(*) FROM enumtmp WHERE a >= 'g'::rainbow;
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