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eeb60e45d8
SERIALIZABLE no longer inhibits parallelism, so we can drop some outdated workarounds and comments from regression tests. The change came in release 12, commit bb16aba5, but it's not really worth back-patching. Also fix a typo. Reviewed-by: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com> Discussion: https://postgr.es/m/CA%2BhUKGJUaHeK%3DHLATxF1JOKDjKJVrBKA-zmbPAebOM0Se2FQRg%40mail.gmail.com
106 lines
3.7 KiB
PL/PgSQL
106 lines
3.7 KiB
PL/PgSQL
--
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-- EXPLAIN
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--
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-- There are many test cases elsewhere that use EXPLAIN as a vehicle for
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-- checking something else (usually planner behavior). This file is
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-- concerned with testing EXPLAIN in its own right.
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--
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-- To produce stable regression test output, it's usually necessary to
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-- ignore details such as exact costs or row counts. These filter
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-- functions replace changeable output details with fixed strings.
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create function explain_filter(text) returns setof text
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language plpgsql as
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$$
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declare
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ln text;
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begin
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for ln in execute $1
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loop
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-- Replace any numeric word with just 'N'
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ln := regexp_replace(ln, '\m\d+\M', 'N', 'g');
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-- In sort output, the above won't match units-suffixed numbers
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ln := regexp_replace(ln, '\m\d+kB', 'NkB', 'g');
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-- Ignore text-mode buffers output because it varies depending
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-- on the system state
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CONTINUE WHEN (ln ~ ' +Buffers: .*');
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-- Ignore text-mode "Planning:" line because whether it's output
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-- varies depending on the system state
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CONTINUE WHEN (ln = 'Planning:');
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return next ln;
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end loop;
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end;
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$$;
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-- To produce valid JSON output, replace numbers with "0" or "0.0" not "N"
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create function explain_filter_to_json(text) returns jsonb
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language plpgsql as
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$$
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declare
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data text := '';
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ln text;
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begin
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for ln in execute $1
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loop
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-- Replace any numeric word with just '0'
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ln := regexp_replace(ln, '\m\d+\M', '0', 'g');
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data := data || ln;
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end loop;
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return data::jsonb;
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end;
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$$;
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-- Simple cases
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select explain_filter('explain select * from int8_tbl i8');
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select explain_filter('explain (analyze) select * from int8_tbl i8');
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select explain_filter('explain (analyze, verbose) select * from int8_tbl i8');
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select explain_filter('explain (analyze, buffers, format text) select * from int8_tbl i8');
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select explain_filter('explain (analyze, buffers, format json) select * from int8_tbl i8');
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select explain_filter('explain (analyze, buffers, format xml) select * from int8_tbl i8');
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select explain_filter('explain (analyze, buffers, format yaml) select * from int8_tbl i8');
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select explain_filter('explain (buffers, format text) select * from int8_tbl i8');
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select explain_filter('explain (buffers, format json) select * from int8_tbl i8');
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-- SETTINGS option
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-- We have to ignore other settings that might be imposed by the environment,
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-- so printing the whole Settings field unfortunately won't do.
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begin;
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set local plan_cache_mode = force_generic_plan;
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select true as "OK"
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from explain_filter('explain (settings) select * from int8_tbl i8') ln
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where ln ~ '^ *Settings: .*plan_cache_mode = ''force_generic_plan''';
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select explain_filter_to_json('explain (settings, format json) select * from int8_tbl i8') #> '{0,Settings,plan_cache_mode}';
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rollback;
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--
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-- Test production of per-worker data
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--
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-- Unfortunately, because we don't know how many worker processes we'll
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-- actually get (maybe none at all), we can't examine the "Workers" output
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-- in any detail. We can check that it parses correctly as JSON, and then
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-- remove it from the displayed results.
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begin;
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-- encourage use of parallel plans
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set parallel_setup_cost=0;
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set parallel_tuple_cost=0;
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set min_parallel_table_scan_size=0;
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set max_parallel_workers_per_gather=4;
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select jsonb_pretty(
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explain_filter_to_json('explain (analyze, verbose, buffers, format json)
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select * from tenk1 order by tenthous')
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-- remove "Workers" node of the Seq Scan plan node
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#- '{0,Plan,Plans,0,Plans,0,Workers}'
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-- remove "Workers" node of the Sort plan node
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#- '{0,Plan,Plans,0,Workers}'
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-- Also remove its sort-type fields, as those aren't 100% stable
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#- '{0,Plan,Plans,0,Sort Method}'
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#- '{0,Plan,Plans,0,Sort Space Type}'
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);
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rollback;
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