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+--
+-- EXPLAIN
+--
+-- There are many test cases elsewhere that use EXPLAIN as a vehicle for
+-- checking something else (usually planner behavior). This file is
+-- concerned with testing EXPLAIN in its own right.
+--
+-- To produce stable regression test output, it's usually necessary to
+-- ignore details such as exact costs or row counts. These filter
+-- functions replace changeable output details with fixed strings.
+create function explain_filter(text) returns setof text
+language plpgsql as
+$$
+declare
+ ln text;
+begin
+ for ln in execute $1
+ loop
+ -- Replace any numeric word with just 'N'
+ ln := regexp_replace(ln, '-?\m\d+\M', 'N', 'g');
+ -- In sort output, the above won't match units-suffixed numbers
+ ln := regexp_replace(ln, '\m\d+kB', 'NkB', 'g');
+ -- Ignore text-mode buffers output because it varies depending
+ -- on the system state
+ CONTINUE WHEN (ln ~ ' +Buffers: .*');
+ -- Ignore text-mode "Planning:" line because whether it's output
+ -- varies depending on the system state
+ CONTINUE WHEN (ln = 'Planning:');
+ return next ln;
+ end loop;
+end;
+$$;
+-- To produce valid JSON output, replace numbers with "0" or "0.0" not "N"
+create function explain_filter_to_json(text) returns jsonb
+language plpgsql as
+$$
+declare
+ data text := '';
+ ln text;
+begin
+ for ln in execute $1
+ loop
+ -- Replace any numeric word with just '0'
+ ln := regexp_replace(ln, '\m\d+\M', '0', 'g');
+ data := data || ln;
+ end loop;
+ return data::jsonb;
+end;
+$$;
+-- Disable JIT, or we'll get different output on machines where that's been
+-- forced on
+set jit = off;
+-- Similarly, disable track_io_timing, to avoid output differences when
+-- enabled.
+set track_io_timing = off;
+-- Simple cases
+select explain_filter('explain select * from int8_tbl i8');
+ explain_filter
+---------------------------------------------------------
+ Seq Scan on int8_tbl i8 (cost=N.N..N.N rows=N width=N)
+(1 row)
+
+select explain_filter('explain (analyze) select * from int8_tbl i8');
+ explain_filter
+-----------------------------------------------------------------------------------------------
+ Seq Scan on int8_tbl i8 (cost=N.N..N.N rows=N width=N) (actual time=N.N..N.N rows=N loops=N)
+ Planning Time: N.N ms
+ Execution Time: N.N ms
+(3 rows)
+
+select explain_filter('explain (analyze, verbose) select * from int8_tbl i8');
+ explain_filter
+------------------------------------------------------------------------------------------------------
+ Seq Scan on public.int8_tbl i8 (cost=N.N..N.N rows=N width=N) (actual time=N.N..N.N rows=N loops=N)
+ Output: q1, q2
+ Planning Time: N.N ms
+ Execution Time: N.N ms
+(4 rows)
+
+select explain_filter('explain (analyze, buffers, format text) select * from int8_tbl i8');
+ explain_filter
+-----------------------------------------------------------------------------------------------
+ Seq Scan on int8_tbl i8 (cost=N.N..N.N rows=N width=N) (actual time=N.N..N.N rows=N loops=N)
+ Planning Time: N.N ms
+ Execution Time: N.N ms
+(3 rows)
+
+select explain_filter('explain (analyze, buffers, format xml) select * from int8_tbl i8');
+ explain_filter
+--------------------------------------------------------
+ <explain xmlns="http://www.postgresql.org/N/explain"> +
+ <Query> +
+ <Plan> +
+ <Node-Type>Seq Scan</Node-Type> +
+ <Parallel-Aware>false</Parallel-Aware> +
+ <Async-Capable>false</Async-Capable> +
+ <Relation-Name>int8_tbl</Relation-Name> +
+ <Alias>i8</Alias> +
+ <Startup-Cost>N.N</Startup-Cost> +
+ <Total-Cost>N.N</Total-Cost> +
+ <Plan-Rows>N</Plan-Rows> +
+ <Plan-Width>N</Plan-Width> +
+ <Actual-Startup-Time>N.N</Actual-Startup-Time> +
+ <Actual-Total-Time>N.N</Actual-Total-Time> +
+ <Actual-Rows>N</Actual-Rows> +
+ <Actual-Loops>N</Actual-Loops> +
+ <Shared-Hit-Blocks>N</Shared-Hit-Blocks> +
+ <Shared-Read-Blocks>N</Shared-Read-Blocks> +
+ <Shared-Dirtied-Blocks>N</Shared-Dirtied-Blocks>+
+ <Shared-Written-Blocks>N</Shared-Written-Blocks>+
+ <Local-Hit-Blocks>N</Local-Hit-Blocks> +
+ <Local-Read-Blocks>N</Local-Read-Blocks> +
+ <Local-Dirtied-Blocks>N</Local-Dirtied-Blocks> +
+ <Local-Written-Blocks>N</Local-Written-Blocks> +
+ <Temp-Read-Blocks>N</Temp-Read-Blocks> +
+ <Temp-Written-Blocks>N</Temp-Written-Blocks> +
+ </Plan> +
+ <Planning> +
+ <Shared-Hit-Blocks>N</Shared-Hit-Blocks> +
+ <Shared-Read-Blocks>N</Shared-Read-Blocks> +
+ <Shared-Dirtied-Blocks>N</Shared-Dirtied-Blocks>+
+ <Shared-Written-Blocks>N</Shared-Written-Blocks>+
+ <Local-Hit-Blocks>N</Local-Hit-Blocks> +
+ <Local-Read-Blocks>N</Local-Read-Blocks> +
+ <Local-Dirtied-Blocks>N</Local-Dirtied-Blocks> +
+ <Local-Written-Blocks>N</Local-Written-Blocks> +
+ <Temp-Read-Blocks>N</Temp-Read-Blocks> +
+ <Temp-Written-Blocks>N</Temp-Written-Blocks> +
+ </Planning> +
+ <Planning-Time>N.N</Planning-Time> +
+ <Triggers> +
+ </Triggers> +
+ <Execution-Time>N.N</Execution-Time> +
+ </Query> +
+ </explain>
+(1 row)
+
+select explain_filter('explain (analyze, buffers, format yaml) select * from int8_tbl i8');
+ explain_filter
+-------------------------------
+ - Plan: +
+ Node Type: "Seq Scan" +
+ Parallel Aware: false +
+ Async Capable: false +
+ Relation Name: "int8_tbl"+
+ Alias: "i8" +
+ Startup Cost: N.N +
+ Total Cost: N.N +
+ Plan Rows: N +
+ Plan Width: N +
+ Actual Startup Time: N.N +
+ Actual Total Time: N.N +
+ Actual Rows: N +
+ Actual Loops: N +
+ Shared Hit Blocks: N +
+ Shared Read Blocks: N +
+ Shared Dirtied Blocks: N +
+ Shared Written Blocks: N +
+ Local Hit Blocks: N +
+ Local Read Blocks: N +
+ Local Dirtied Blocks: N +
+ Local Written Blocks: N +
+ Temp Read Blocks: N +
+ Temp Written Blocks: N +
+ Planning: +
+ Shared Hit Blocks: N +
+ Shared Read Blocks: N +
+ Shared Dirtied Blocks: N +
+ Shared Written Blocks: N +
+ Local Hit Blocks: N +
+ Local Read Blocks: N +
+ Local Dirtied Blocks: N +
+ Local Written Blocks: N +
+ Temp Read Blocks: N +
+ Temp Written Blocks: N +
+ Planning Time: N.N +
+ Triggers: +
+ Execution Time: N.N
+(1 row)
+
+select explain_filter('explain (buffers, format text) select * from int8_tbl i8');
+ explain_filter
+---------------------------------------------------------
+ Seq Scan on int8_tbl i8 (cost=N.N..N.N rows=N width=N)
+(1 row)
+
+select explain_filter('explain (buffers, format json) select * from int8_tbl i8');
+ explain_filter
+------------------------------------
+ [ +
+ { +
+ "Plan": { +
+ "Node Type": "Seq Scan", +
+ "Parallel Aware": false, +
+ "Async Capable": false, +
+ "Relation Name": "int8_tbl",+
+ "Alias": "i8", +
+ "Startup Cost": N.N, +
+ "Total Cost": N.N, +
+ "Plan Rows": N, +
+ "Plan Width": N, +
+ "Shared Hit Blocks": N, +
+ "Shared Read Blocks": N, +
+ "Shared Dirtied Blocks": N, +
+ "Shared Written Blocks": N, +
+ "Local Hit Blocks": N, +
+ "Local Read Blocks": N, +
+ "Local Dirtied Blocks": N, +
+ "Local Written Blocks": N, +
+ "Temp Read Blocks": N, +
+ "Temp Written Blocks": N +
+ }, +
+ "Planning": { +
+ "Shared Hit Blocks": N, +
+ "Shared Read Blocks": N, +
+ "Shared Dirtied Blocks": N, +
+ "Shared Written Blocks": N, +
+ "Local Hit Blocks": N, +
+ "Local Read Blocks": N, +
+ "Local Dirtied Blocks": N, +
+ "Local Written Blocks": N, +
+ "Temp Read Blocks": N, +
+ "Temp Written Blocks": N +
+ } +
+ } +
+ ]
+(1 row)
+
+-- Check output including I/O timings. These fields are conditional
+-- but always set in JSON format, so check them only in this case.
+set track_io_timing = on;
+select explain_filter('explain (analyze, buffers, format json) select * from int8_tbl i8');
+ explain_filter
+------------------------------------
+ [ +
+ { +
+ "Plan": { +
+ "Node Type": "Seq Scan", +
+ "Parallel Aware": false, +
+ "Async Capable": false, +
+ "Relation Name": "int8_tbl",+
+ "Alias": "i8", +
+ "Startup Cost": N.N, +
+ "Total Cost": N.N, +
+ "Plan Rows": N, +
+ "Plan Width": N, +
+ "Actual Startup Time": N.N, +
+ "Actual Total Time": N.N, +
+ "Actual Rows": N, +
+ "Actual Loops": N, +
+ "Shared Hit Blocks": N, +
+ "Shared Read Blocks": N, +
+ "Shared Dirtied Blocks": N, +
+ "Shared Written Blocks": N, +
+ "Local Hit Blocks": N, +
+ "Local Read Blocks": N, +
+ "Local Dirtied Blocks": N, +
+ "Local Written Blocks": N, +
+ "Temp Read Blocks": N, +
+ "Temp Written Blocks": N, +
+ "I/O Read Time": N.N, +
+ "I/O Write Time": N.N, +
+ "Temp I/O Read Time": N.N, +
+ "Temp I/O Write Time": N.N +
+ }, +
+ "Planning": { +
+ "Shared Hit Blocks": N, +
+ "Shared Read Blocks": N, +
+ "Shared Dirtied Blocks": N, +
+ "Shared Written Blocks": N, +
+ "Local Hit Blocks": N, +
+ "Local Read Blocks": N, +
+ "Local Dirtied Blocks": N, +
+ "Local Written Blocks": N, +
+ "Temp Read Blocks": N, +
+ "Temp Written Blocks": N, +
+ "I/O Read Time": N.N, +
+ "I/O Write Time": N.N, +
+ "Temp I/O Read Time": N.N, +
+ "Temp I/O Write Time": N.N +
+ }, +
+ "Planning Time": N.N, +
+ "Triggers": [ +
+ ], +
+ "Execution Time": N.N +
+ } +
+ ]
+(1 row)
+
+set track_io_timing = off;
+-- SETTINGS option
+-- We have to ignore other settings that might be imposed by the environment,
+-- so printing the whole Settings field unfortunately won't do.
+begin;
+set local plan_cache_mode = force_generic_plan;
+select true as "OK"
+ from explain_filter('explain (settings) select * from int8_tbl i8') ln
+ where ln ~ '^ *Settings: .*plan_cache_mode = ''force_generic_plan''';
+ OK
+----
+ t
+(1 row)
+
+select explain_filter_to_json('explain (settings, format json) select * from int8_tbl i8') #> '{0,Settings,plan_cache_mode}';
+ ?column?
+----------------------
+ "force_generic_plan"
+(1 row)
+
+rollback;
+--
+-- Test production of per-worker data
+--
+-- Unfortunately, because we don't know how many worker processes we'll
+-- actually get (maybe none at all), we can't examine the "Workers" output
+-- in any detail. We can check that it parses correctly as JSON, and then
+-- remove it from the displayed results.
+begin;
+-- encourage use of parallel plans
+set parallel_setup_cost=0;
+set parallel_tuple_cost=0;
+set min_parallel_table_scan_size=0;
+set max_parallel_workers_per_gather=4;
+select jsonb_pretty(
+ explain_filter_to_json('explain (analyze, verbose, buffers, format json)
+ select * from tenk1 order by tenthous')
+ -- remove "Workers" node of the Seq Scan plan node
+ #- '{0,Plan,Plans,0,Plans,0,Workers}'
+ -- remove "Workers" node of the Sort plan node
+ #- '{0,Plan,Plans,0,Workers}'
+ -- Also remove its sort-type fields, as those aren't 100% stable
+ #- '{0,Plan,Plans,0,Sort Method}'
+ #- '{0,Plan,Plans,0,Sort Space Type}'
+);
+ jsonb_pretty
+-------------------------------------------------------------
+ [ +
+ { +
+ "Plan": { +
+ "Plans": [ +
+ { +
+ "Plans": [ +
+ { +
+ "Alias": "tenk1", +
+ "Output": [ +
+ "unique1", +
+ "unique2", +
+ "two", +
+ "four", +
+ "ten", +
+ "twenty", +
+ "hundred", +
+ "thousand", +
+ "twothousand", +
+ "fivethous", +
+ "tenthous", +
+ "odd", +
+ "even", +
+ "stringu1", +
+ "stringu2", +
+ "string4" +
+ ], +
+ "Schema": "public", +
+ "Node Type": "Seq Scan", +
+ "Plan Rows": 0, +
+ "Plan Width": 0, +
+ "Total Cost": 0.0, +
+ "Actual Rows": 0, +
+ "Actual Loops": 0, +
+ "Startup Cost": 0.0, +
+ "Async Capable": false, +
+ "Relation Name": "tenk1", +
+ "Parallel Aware": true, +
+ "Local Hit Blocks": 0, +
+ "Temp Read Blocks": 0, +
+ "Actual Total Time": 0.0, +
+ "Local Read Blocks": 0, +
+ "Shared Hit Blocks": 0, +
+ "Shared Read Blocks": 0, +
+ "Actual Startup Time": 0.0, +
+ "Parent Relationship": "Outer",+
+ "Temp Written Blocks": 0, +
+ "Local Dirtied Blocks": 0, +
+ "Local Written Blocks": 0, +
+ "Shared Dirtied Blocks": 0, +
+ "Shared Written Blocks": 0 +
+ } +
+ ], +
+ "Output": [ +
+ "unique1", +
+ "unique2", +
+ "two", +
+ "four", +
+ "ten", +
+ "twenty", +
+ "hundred", +
+ "thousand", +
+ "twothousand", +
+ "fivethous", +
+ "tenthous", +
+ "odd", +
+ "even", +
+ "stringu1", +
+ "stringu2", +
+ "string4" +
+ ], +
+ "Sort Key": [ +
+ "tenk1.tenthous" +
+ ], +
+ "Node Type": "Sort", +
+ "Plan Rows": 0, +
+ "Plan Width": 0, +
+ "Total Cost": 0.0, +
+ "Actual Rows": 0, +
+ "Actual Loops": 0, +
+ "Startup Cost": 0.0, +
+ "Async Capable": false, +
+ "Parallel Aware": false, +
+ "Sort Space Used": 0, +
+ "Local Hit Blocks": 0, +
+ "Temp Read Blocks": 0, +
+ "Actual Total Time": 0.0, +
+ "Local Read Blocks": 0, +
+ "Shared Hit Blocks": 0, +
+ "Shared Read Blocks": 0, +
+ "Actual Startup Time": 0.0, +
+ "Parent Relationship": "Outer", +
+ "Temp Written Blocks": 0, +
+ "Local Dirtied Blocks": 0, +
+ "Local Written Blocks": 0, +
+ "Shared Dirtied Blocks": 0, +
+ "Shared Written Blocks": 0 +
+ } +
+ ], +
+ "Output": [ +
+ "unique1", +
+ "unique2", +
+ "two", +
+ "four", +
+ "ten", +
+ "twenty", +
+ "hundred", +
+ "thousand", +
+ "twothousand", +
+ "fivethous", +
+ "tenthous", +
+ "odd", +
+ "even", +
+ "stringu1", +
+ "stringu2", +
+ "string4" +
+ ], +
+ "Node Type": "Gather Merge", +
+ "Plan Rows": 0, +
+ "Plan Width": 0, +
+ "Total Cost": 0.0, +
+ "Actual Rows": 0, +
+ "Actual Loops": 0, +
+ "Startup Cost": 0.0, +
+ "Async Capable": false, +
+ "Parallel Aware": false, +
+ "Workers Planned": 0, +
+ "Local Hit Blocks": 0, +
+ "Temp Read Blocks": 0, +
+ "Workers Launched": 0, +
+ "Actual Total Time": 0.0, +
+ "Local Read Blocks": 0, +
+ "Shared Hit Blocks": 0, +
+ "Shared Read Blocks": 0, +
+ "Actual Startup Time": 0.0, +
+ "Temp Written Blocks": 0, +
+ "Local Dirtied Blocks": 0, +
+ "Local Written Blocks": 0, +
+ "Shared Dirtied Blocks": 0, +
+ "Shared Written Blocks": 0 +
+ }, +
+ "Planning": { +
+ "Local Hit Blocks": 0, +
+ "Temp Read Blocks": 0, +
+ "Local Read Blocks": 0, +
+ "Shared Hit Blocks": 0, +
+ "Shared Read Blocks": 0, +
+ "Temp Written Blocks": 0, +
+ "Local Dirtied Blocks": 0, +
+ "Local Written Blocks": 0, +
+ "Shared Dirtied Blocks": 0, +
+ "Shared Written Blocks": 0 +
+ }, +
+ "Triggers": [ +
+ ], +
+ "Planning Time": 0.0, +
+ "Execution Time": 0.0 +
+ } +
+ ]
+(1 row)
+
+rollback;
+-- Test display of temporary objects
+create temp table t1(f1 float8);
+create function pg_temp.mysin(float8) returns float8 language plpgsql
+as 'begin return sin($1); end';
+select explain_filter('explain (verbose) select * from t1 where pg_temp.mysin(f1) < 0.5');
+ explain_filter
+------------------------------------------------------------
+ Seq Scan on pg_temp.t1 (cost=N.N..N.N rows=N width=N)
+ Output: f1
+ Filter: (pg_temp.mysin(t1.f1) < 'N.N'::double precision)
+(3 rows)
+
+-- Test compute_query_id
+set compute_query_id = on;
+select explain_filter('explain (verbose) select * from int8_tbl i8');
+ explain_filter
+----------------------------------------------------------------
+ Seq Scan on public.int8_tbl i8 (cost=N.N..N.N rows=N width=N)
+ Output: q1, q2
+ Query Identifier: N
+(3 rows)
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-23 19:47:09 +0000