--
-- Statement level tracking
--
SET pg_stat_statements.track_utility = TRUE;
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

-- DO block - top-level tracking.
CREATE TABLE stats_track_tab (x int);
SET pg_stat_statements.track = 'top';
DELETE FROM stats_track_tab;
DO $$
BEGIN
  DELETE FROM stats_track_tab;
END;
$$ LANGUAGE plpgsql;
SELECT toplevel, calls, query FROM pg_stat_statements
  WHERE query LIKE '%DELETE%' ORDER BY query COLLATE "C", toplevel;
 toplevel | calls |             query              
----------+-------+--------------------------------
 t        |     1 | DELETE FROM stats_track_tab
 t        |     1 | DO $$                         +
          |       | BEGIN                         +
          |       |   DELETE FROM stats_track_tab;+
          |       | END;                          +
          |       | $$ LANGUAGE plpgsql
(2 rows)

SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

-- DO block - all-level tracking.
SET pg_stat_statements.track = 'all';
DELETE FROM stats_track_tab;
DO $$
BEGIN
  DELETE FROM stats_track_tab;
END; $$;
DO LANGUAGE plpgsql $$
BEGIN
  -- this is a SELECT
  PERFORM 'hello world'::TEXT;
END; $$;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C", toplevel;
 toplevel | calls |                       query                        
----------+-------+----------------------------------------------------
 f        |     1 | DELETE FROM stats_track_tab
 t        |     1 | DELETE FROM stats_track_tab
 t        |     1 | DO $$                                             +
          |       | BEGIN                                             +
          |       |   DELETE FROM stats_track_tab;                    +
          |       | END; $$
 t        |     1 | DO LANGUAGE plpgsql $$                            +
          |       | BEGIN                                             +
          |       |   -- this is a SELECT                             +
          |       |   PERFORM 'hello world'::TEXT;                    +
          |       | END; $$
 f        |     1 | SELECT $1::TEXT
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
 t        |     1 | SET pg_stat_statements.track = $1
(7 rows)

-- Procedure with multiple utility statements.
CREATE OR REPLACE PROCEDURE proc_with_utility_stmt()
LANGUAGE SQL
AS $$
  SHOW pg_stat_statements.track;
  show pg_stat_statements.track;
  SHOW pg_stat_statements.track_utility;
$$;
SET pg_stat_statements.track_utility = TRUE;
-- all-level tracking.
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

CALL proc_with_utility_stmt();
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C", toplevel;
 toplevel | calls |                       query                        
----------+-------+----------------------------------------------------
 t        |     1 | CALL proc_with_utility_stmt()
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
 f        |     2 | SHOW pg_stat_statements.track
 f        |     1 | SHOW pg_stat_statements.track_utility
(4 rows)

-- top-level tracking.
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

CALL proc_with_utility_stmt();
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C", toplevel;
 toplevel | calls |                       query                        
----------+-------+----------------------------------------------------
 t        |     1 | CALL proc_with_utility_stmt()
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(2 rows)

-- EXPLAIN - all-level tracking.
CREATE TABLE test_table (x int);
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

EXPLAIN (COSTS OFF) SELECT 1;
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) (SELECT 1, 2);
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) TABLE stats_track_tab;
         QUERY PLAN          
-----------------------------
 Seq Scan on stats_track_tab
(1 row)

EXPLAIN (COSTS OFF) (TABLE test_table);
       QUERY PLAN       
------------------------
 Seq Scan on test_table
(1 row)

EXPLAIN (COSTS OFF) VALUES (1);
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) (VALUES (1, 2));
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1 WHERE x = 1;
            QUERY PLAN             
-----------------------------------
 Update on stats_track_tab
   ->  Seq Scan on stats_track_tab
         Filter: (x = 1)
(3 rows)

EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab;
            QUERY PLAN             
-----------------------------------
 Delete on stats_track_tab
   ->  Seq Scan on stats_track_tab
(2 rows)

EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1));
        QUERY PLAN         
---------------------------
 Insert on stats_track_tab
   ->  Result
(2 rows)

EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab
  USING (SELECT id FROM generate_series(1, 10) id) ON x = id
  WHEN MATCHED THEN UPDATE SET x = id
  WHEN NOT MATCHED THEN INSERT (x) VALUES (id);
                      QUERY PLAN                       
-------------------------------------------------------
 Merge on stats_track_tab
   ->  Hash Right Join
         Hash Cond: (stats_track_tab.x = id.id)
         ->  Seq Scan on stats_track_tab
         ->  Hash
               ->  Function Scan on generate_series id
(6 rows)

EXPLAIN (COSTS OFF) SELECT 1 UNION SELECT 2;
        QUERY PLAN        
--------------------------
 Unique
   ->  Sort
         Sort Key: (1)
         ->  Append
               ->  Result
               ->  Result
(6 rows)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                               query                                
----------+-------+--------------------------------------------------------------------
 f        |     1 | DELETE FROM stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) (SELECT $1, $2)
 t        |     1 | EXPLAIN (COSTS OFF) (TABLE test_table)
 t        |     1 | EXPLAIN (COSTS OFF) (VALUES ($1, $2))
 t        |     1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES (($1))
 t        |     1 | EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab                    +
          |       |   USING (SELECT id FROM generate_series($1, $2) id) ON x = id     +
          |       |   WHEN MATCHED THEN UPDATE SET x = id                             +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1 UNION SELECT $2
 t        |     1 | EXPLAIN (COSTS OFF) TABLE stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1 WHERE x = $2
 t        |     1 | EXPLAIN (COSTS OFF) VALUES ($1)
 f        |     1 | INSERT INTO stats_track_tab VALUES (($1))
 f        |     1 | MERGE INTO stats_track_tab                                        +
          |       |   USING (SELECT id FROM generate_series($1, $2) id) ON x = id     +
          |       |   WHEN MATCHED THEN UPDATE SET x = id                             +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
 f        |     1 | SELECT $1
 f        |     1 | SELECT $1 UNION SELECT $2
 f        |     1 | SELECT $1, $2
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
 f        |     1 | TABLE stats_track_tab
 f        |     1 | TABLE test_table
 f        |     1 | UPDATE stats_track_tab SET x = $1 WHERE x = $2
 f        |     1 | VALUES ($1)
 f        |     1 | VALUES ($1, $2)
(23 rows)

-- EXPLAIN - top-level tracking.
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

EXPLAIN (COSTS OFF) SELECT 1;
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) (SELECT 1, 2);
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) TABLE stats_track_tab;
         QUERY PLAN          
-----------------------------
 Seq Scan on stats_track_tab
(1 row)

EXPLAIN (COSTS OFF) (TABLE test_table);
       QUERY PLAN       
------------------------
 Seq Scan on test_table
(1 row)

EXPLAIN (COSTS OFF) VALUES (1);
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) (VALUES (1, 2));
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1 WHERE x = 1;
            QUERY PLAN             
-----------------------------------
 Update on stats_track_tab
   ->  Seq Scan on stats_track_tab
         Filter: (x = 1)
(3 rows)

EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab;
            QUERY PLAN             
-----------------------------------
 Delete on stats_track_tab
   ->  Seq Scan on stats_track_tab
(2 rows)

EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1));
        QUERY PLAN         
---------------------------
 Insert on stats_track_tab
   ->  Result
(2 rows)

EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab
  USING (SELECT id FROM generate_series(1, 10) id) ON x = id
  WHEN MATCHED THEN UPDATE SET x = id
  WHEN NOT MATCHED THEN INSERT (x) VALUES (id);
                      QUERY PLAN                       
-------------------------------------------------------
 Merge on stats_track_tab
   ->  Hash Right Join
         Hash Cond: (stats_track_tab.x = id.id)
         ->  Seq Scan on stats_track_tab
         ->  Hash
               ->  Function Scan on generate_series id
(6 rows)

EXPLAIN (COSTS OFF) SELECT 1 UNION SELECT 2;
        QUERY PLAN        
--------------------------
 Unique
   ->  Sort
         Sort Key: (1)
         ->  Append
               ->  Result
               ->  Result
(6 rows)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                               query                                
----------+-------+--------------------------------------------------------------------
 t        |     1 | EXPLAIN (COSTS OFF) (SELECT $1, $2)
 t        |     1 | EXPLAIN (COSTS OFF) (TABLE test_table)
 t        |     1 | EXPLAIN (COSTS OFF) (VALUES ($1, $2))
 t        |     1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES (($1))
 t        |     1 | EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab                    +
          |       |   USING (SELECT id FROM generate_series($1, $2) id) ON x = id     +
          |       |   WHEN MATCHED THEN UPDATE SET x = id                             +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1 UNION SELECT $2
 t        |     1 | EXPLAIN (COSTS OFF) TABLE stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1 WHERE x = $2
 t        |     1 | EXPLAIN (COSTS OFF) VALUES ($1)
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(12 rows)

-- EXPLAIN - all-level tracking with multi-statement strings.
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

-- SELECT queries
EXPLAIN (COSTS OFF) SELECT 1\; EXPLAIN (COSTS OFF) SELECT 1, 2;
 QUERY PLAN 
------------
 Result
(1 row)

 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) (SELECT 1, 2, 3)\; EXPLAIN (COSTS OFF) (SELECT 1, 2, 3, 4);
 QUERY PLAN 
------------
 Result
(1 row)

 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) SELECT 1, 2 UNION SELECT 3, 4\; EXPLAIN (COSTS OFF) (SELECT 1, 2, 3) UNION SELECT 3, 4, 5;
         QUERY PLAN         
----------------------------
 Unique
   ->  Sort
         Sort Key: (1), (2)
         ->  Append
               ->  Result
               ->  Result
(6 rows)

           QUERY PLAN            
---------------------------------
 Unique
   ->  Sort
         Sort Key: (1), (2), (3)
         ->  Append
               ->  Result
               ->  Result
(6 rows)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                              query                              
----------+-------+-----------------------------------------------------------------
 f        |     1 | (SELECT $1, $2, $3) UNION SELECT $4, $5, $6
 t        |     1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3)
 t        |     1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3) UNION SELECT $4, $5, $6
 t        |     1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3, $4)
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1, $2
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1, $2 UNION SELECT $3, $4
 f        |     1 | SELECT $1
 f        |     1 | SELECT $1, $2
 f        |     1 | SELECT $1, $2 UNION SELECT $3, $4
 f        |     1 | SELECT $1, $2, $3
 f        |     1 | SELECT $1, $2, $3, $4
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(13 rows)

SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

-- Most DMLs
EXPLAIN (COSTS OFF) TABLE stats_track_tab\; EXPLAIN (COSTS OFF) (TABLE test_table);
         QUERY PLAN          
-----------------------------
 Seq Scan on stats_track_tab
(1 row)

       QUERY PLAN       
------------------------
 Seq Scan on test_table
(1 row)

EXPLAIN (COSTS OFF) VALUES (1)\; EXPLAIN (COSTS OFF) (VALUES (1, 2));
 QUERY PLAN 
------------
 Result
(1 row)

 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1 WHERE x = 1\; EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1;
            QUERY PLAN             
-----------------------------------
 Update on stats_track_tab
   ->  Seq Scan on stats_track_tab
         Filter: (x = 1)
(3 rows)

            QUERY PLAN             
-----------------------------------
 Update on stats_track_tab
   ->  Seq Scan on stats_track_tab
(2 rows)

EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab\; EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab WHERE x = 1;
            QUERY PLAN             
-----------------------------------
 Delete on stats_track_tab
   ->  Seq Scan on stats_track_tab
(2 rows)

            QUERY PLAN             
-----------------------------------
 Delete on stats_track_tab
   ->  Seq Scan on stats_track_tab
         Filter: (x = 1)
(3 rows)

EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1))\; EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES (1), (2);
        QUERY PLAN         
---------------------------
 Insert on stats_track_tab
   ->  Result
(2 rows)

           QUERY PLAN            
---------------------------------
 Insert on stats_track_tab
   ->  Values Scan on "*VALUES*"
(2 rows)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                               query                                
----------+-------+--------------------------------------------------------------------
 f        |     1 | DELETE FROM stats_track_tab
 f        |     1 | DELETE FROM stats_track_tab WHERE x = $1
 t        |     1 | EXPLAIN (COSTS OFF) (TABLE test_table)
 t        |     1 | EXPLAIN (COSTS OFF) (VALUES ($1, $2))
 t        |     1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab WHERE x = $1
 t        |     1 | EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ($1), ($2)
 t        |     1 | EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES (($1))
 t        |     1 | EXPLAIN (COSTS OFF) TABLE stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1
 t        |     1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1 WHERE x = $2
 t        |     1 | EXPLAIN (COSTS OFF) VALUES ($1)
 f        |     1 | INSERT INTO stats_track_tab VALUES ($1), ($2)
 f        |     1 | INSERT INTO stats_track_tab VALUES (($1))
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
 f        |     1 | TABLE stats_track_tab
 f        |     1 | TABLE test_table
 f        |     1 | UPDATE stats_track_tab SET x = $1
 f        |     1 | UPDATE stats_track_tab SET x = $1 WHERE x = $2
 f        |     1 | VALUES ($1)
 f        |     1 | VALUES ($1, $2)
(21 rows)

SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

-- MERGE, worth its own.
EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab
  USING (SELECT id FROM generate_series(1, 10) id) ON x = id
  WHEN MATCHED THEN UPDATE SET x = id
  WHEN NOT MATCHED THEN INSERT (x) VALUES (id)\; EXPLAIN (COSTS OFF) SELECT 1, 2, 3, 4, 5;
                      QUERY PLAN                       
-------------------------------------------------------
 Merge on stats_track_tab
   ->  Hash Right Join
         Hash Cond: (stats_track_tab.x = id.id)
         ->  Seq Scan on stats_track_tab
         ->  Hash
               ->  Function Scan on generate_series id
(6 rows)

 QUERY PLAN 
------------
 Result
(1 row)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                             query                             
----------+-------+---------------------------------------------------------------
 t        |     1 | EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab               +
          |       |   USING (SELECT id FROM generate_series($1, $2) id) ON x = id+
          |       |   WHEN MATCHED THEN UPDATE SET x = id                        +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1, $2, $3, $4, $5
 f        |     1 | MERGE INTO stats_track_tab                                   +
          |       |   USING (SELECT id FROM generate_series($1, $2) id) ON x = id+
          |       |   WHEN MATCHED THEN UPDATE SET x = id                        +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
 f        |     1 | SELECT $1, $2, $3, $4, $5
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(5 rows)

-- EXPLAIN - top-level tracking with multi-statement strings.
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

EXPLAIN (COSTS OFF) SELECT 1\; EXPLAIN (COSTS OFF) SELECT 1, 2;
 QUERY PLAN 
------------
 Result
(1 row)

 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) (SELECT 1, 2, 3)\; EXPLAIN (COSTS OFF) (SELECT 1, 2, 3, 4);
 QUERY PLAN 
------------
 Result
(1 row)

 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) TABLE stats_track_tab\; EXPLAIN (COSTS OFF) (TABLE test_table);
         QUERY PLAN          
-----------------------------
 Seq Scan on stats_track_tab
(1 row)

       QUERY PLAN       
------------------------
 Seq Scan on test_table
(1 row)

EXPLAIN (COSTS OFF) VALUES (1)\; EXPLAIN (COSTS OFF) (VALUES (1, 2));
 QUERY PLAN 
------------
 Result
(1 row)

 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1 WHERE x = 1\; EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = 1;
            QUERY PLAN             
-----------------------------------
 Update on stats_track_tab
   ->  Seq Scan on stats_track_tab
         Filter: (x = 1)
(3 rows)

            QUERY PLAN             
-----------------------------------
 Update on stats_track_tab
   ->  Seq Scan on stats_track_tab
(2 rows)

EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab\; EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab WHERE x = 1;
            QUERY PLAN             
-----------------------------------
 Delete on stats_track_tab
   ->  Seq Scan on stats_track_tab
(2 rows)

            QUERY PLAN             
-----------------------------------
 Delete on stats_track_tab
   ->  Seq Scan on stats_track_tab
         Filter: (x = 1)
(3 rows)

EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1))\; EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1), (2));
        QUERY PLAN         
---------------------------
 Insert on stats_track_tab
   ->  Result
(2 rows)

ERROR:  INSERT has more expressions than target columns
LINE 1: ...N (COSTS OFF) INSERT INTO stats_track_tab VALUES ((1), (2));
                                                                   ^
EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab USING (SELECT id FROM generate_series(1, 10) id) ON x = id
  WHEN MATCHED THEN UPDATE SET x = id
  WHEN NOT MATCHED THEN INSERT (x) VALUES (id)\; EXPLAIN (COSTS OFF) SELECT 1, 2, 3, 4, 5;
                      QUERY PLAN                       
-------------------------------------------------------
 Merge on stats_track_tab
   ->  Hash Right Join
         Hash Cond: (stats_track_tab.x = id.id)
         ->  Seq Scan on stats_track_tab
         ->  Hash
               ->  Function Scan on generate_series id
(6 rows)

 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) SELECT 1, 2 UNION SELECT 3, 4\; EXPLAIN (COSTS OFF) (SELECT 1, 2, 3) UNION SELECT 3, 4, 5;
         QUERY PLAN         
----------------------------
 Unique
   ->  Sort
         Sort Key: (1), (2)
         ->  Append
               ->  Result
               ->  Result
(6 rows)

           QUERY PLAN            
---------------------------------
 Unique
   ->  Sort
         Sort Key: (1), (2), (3)
         ->  Append
               ->  Result
               ->  Result
(6 rows)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                                                   query                                                    
----------+-------+------------------------------------------------------------------------------------------------------------
 t        |     1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3)
 t        |     1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3) UNION SELECT $4, $5, $6
 t        |     1 | EXPLAIN (COSTS OFF) (SELECT $1, $2, $3, $4)
 t        |     1 | EXPLAIN (COSTS OFF) (TABLE test_table)
 t        |     1 | EXPLAIN (COSTS OFF) (VALUES ($1, $2))
 t        |     1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) DELETE FROM stats_track_tab WHERE x = $1
 t        |     1 | EXPLAIN (COSTS OFF) INSERT INTO stats_track_tab VALUES (($1))
 t        |     1 | EXPLAIN (COSTS OFF) MERGE INTO stats_track_tab USING (SELECT id FROM generate_series($1, $2) id) ON x = id+
          |       |   WHEN MATCHED THEN UPDATE SET x = id                                                                     +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1, $2
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1, $2 UNION SELECT $3, $4
 t        |     1 | EXPLAIN (COSTS OFF) SELECT $1, $2, $3, $4, $5
 t        |     1 | EXPLAIN (COSTS OFF) TABLE stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1
 t        |     1 | EXPLAIN (COSTS OFF) UPDATE stats_track_tab SET x = $1 WHERE x = $2
 t        |     1 | EXPLAIN (COSTS OFF) VALUES ($1)
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(18 rows)

-- EXPLAIN with CTEs - all-level tracking
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) SELECT 1;
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) (WITH a AS (SELECT 4) (SELECT 1, 2));
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) UPDATE stats_track_tab SET x = 1 WHERE x = 1;
            QUERY PLAN             
-----------------------------------
 Update on stats_track_tab
   ->  Seq Scan on stats_track_tab
         Filter: (x = 1)
(3 rows)

EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) DELETE FROM stats_track_tab;
            QUERY PLAN             
-----------------------------------
 Delete on stats_track_tab
   ->  Seq Scan on stats_track_tab
(2 rows)

EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) INSERT INTO stats_track_tab VALUES ((1));
        QUERY PLAN         
---------------------------
 Insert on stats_track_tab
   ->  Result
(2 rows)

EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) MERGE INTO stats_track_tab
  USING (SELECT id FROM generate_series(1, 10) id) ON x = id
  WHEN MATCHED THEN UPDATE SET x = id
  WHEN NOT MATCHED THEN INSERT (x) VALUES (id);
                      QUERY PLAN                       
-------------------------------------------------------
 Merge on stats_track_tab
   ->  Hash Right Join
         Hash Cond: (stats_track_tab.x = id.id)
         ->  Seq Scan on stats_track_tab
         ->  Hash
               ->  Function Scan on generate_series id
(6 rows)

EXPLAIN (COSTS OFF) WITH a AS (select 4) SELECT 1 UNION SELECT 2;
        QUERY PLAN        
--------------------------
 Unique
   ->  Sort
         Sort Key: (1)
         ->  Append
               ->  Result
               ->  Result
(6 rows)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                                          query                                           
----------+-------+------------------------------------------------------------------------------------------
 t        |     1 | EXPLAIN (COSTS OFF) (WITH a AS (SELECT $1) (SELECT $2, $3))
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) DELETE FROM stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) INSERT INTO stats_track_tab VALUES (($2))
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) MERGE INTO stats_track_tab                    +
          |       |   USING (SELECT id FROM generate_series($2, $3) id) ON x = id                           +
          |       |   WHEN MATCHED THEN UPDATE SET x = id                                                   +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) SELECT $2
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) UPDATE stats_track_tab SET x = $2 WHERE x = $3
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (select $1) SELECT $2 UNION SELECT $3
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
 f        |     1 | WITH a AS (SELECT $1) (SELECT $2, $3)
 f        |     1 | WITH a AS (SELECT $1) DELETE FROM stats_track_tab
 f        |     1 | WITH a AS (SELECT $1) INSERT INTO stats_track_tab VALUES (($2))
 f        |     1 | WITH a AS (SELECT $1) MERGE INTO stats_track_tab                                        +
          |       |   USING (SELECT id FROM generate_series($2, $3) id) ON x = id                           +
          |       |   WHEN MATCHED THEN UPDATE SET x = id                                                   +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
 f        |     1 | WITH a AS (SELECT $1) SELECT $2
 f        |     1 | WITH a AS (SELECT $1) UPDATE stats_track_tab SET x = $2 WHERE x = $3
 f        |     1 | WITH a AS (select $1) SELECT $2 UNION SELECT $3
(15 rows)

-- EXPLAIN with CTEs - top-level tracking
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) SELECT 1;
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) (WITH a AS (SELECT 4) (SELECT 1, 2));
 QUERY PLAN 
------------
 Result
(1 row)

EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) UPDATE stats_track_tab SET x = 1 WHERE x = 1;
            QUERY PLAN             
-----------------------------------
 Update on stats_track_tab
   ->  Seq Scan on stats_track_tab
         Filter: (x = 1)
(3 rows)

EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) DELETE FROM stats_track_tab;
            QUERY PLAN             
-----------------------------------
 Delete on stats_track_tab
   ->  Seq Scan on stats_track_tab
(2 rows)

EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) INSERT INTO stats_track_tab VALUES ((1));
        QUERY PLAN         
---------------------------
 Insert on stats_track_tab
   ->  Result
(2 rows)

EXPLAIN (COSTS OFF) WITH a AS (SELECT 4) MERGE INTO stats_track_tab
  USING (SELECT id FROM generate_series(1, 10) id) ON x = id
  WHEN MATCHED THEN UPDATE SET x = id
  WHEN NOT MATCHED THEN INSERT (x) VALUES (id);
                      QUERY PLAN                       
-------------------------------------------------------
 Merge on stats_track_tab
   ->  Hash Right Join
         Hash Cond: (stats_track_tab.x = id.id)
         ->  Seq Scan on stats_track_tab
         ->  Hash
               ->  Function Scan on generate_series id
(6 rows)

EXPLAIN (COSTS OFF) WITH a AS (select 4) SELECT 1 UNION SELECT 2;
        QUERY PLAN        
--------------------------
 Unique
   ->  Sort
         Sort Key: (1)
         ->  Append
               ->  Result
               ->  Result
(6 rows)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                                          query                                           
----------+-------+------------------------------------------------------------------------------------------
 t        |     1 | EXPLAIN (COSTS OFF) (WITH a AS (SELECT $1) (SELECT $2, $3))
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) DELETE FROM stats_track_tab
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) INSERT INTO stats_track_tab VALUES (($2))
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) MERGE INTO stats_track_tab                    +
          |       |   USING (SELECT id FROM generate_series($2, $3) id) ON x = id                           +
          |       |   WHEN MATCHED THEN UPDATE SET x = id                                                   +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id)
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) SELECT $2
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (SELECT $1) UPDATE stats_track_tab SET x = $2 WHERE x = $3
 t        |     1 | EXPLAIN (COSTS OFF) WITH a AS (select $1) SELECT $2 UNION SELECT $3
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(8 rows)

-- Explain analyze, all-level tracking.
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT 100;
            QUERY PLAN             
-----------------------------------
 Result (actual rows=1.00 loops=1)
(1 row)

EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)
  DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab;
                       QUERY PLAN                       
--------------------------------------------------------
 Seq Scan on stats_track_tab (actual rows=0.00 loops=1)
(1 row)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                                    query                                     
----------+-------+------------------------------------------------------------------------------
 t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)          +
          |       |   DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab
 t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT $1
 f        |     1 | SELECT $1
 f        |     1 | SELECT * FROM stats_track_tab
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(5 rows)

-- Explain analyze, top tracking.
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT 100;
            QUERY PLAN             
-----------------------------------
 Result (actual rows=1.00 loops=1)
(1 row)

EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)
  DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab;
                       QUERY PLAN                       
--------------------------------------------------------
 Seq Scan on stats_track_tab (actual rows=0.00 loops=1)
(1 row)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                                    query                                     
----------+-------+------------------------------------------------------------------------------
 t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)          +
          |       |   DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab
 t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT $1
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(3 rows)

-- Create Materialized View, all-level tracking.
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

CREATE MATERIALIZED VIEW pgss_materialized_view AS
  SELECT * FROM generate_series(1, 5) as id;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                       query                        
----------+-------+----------------------------------------------------
 t        |     1 | CREATE MATERIALIZED VIEW pgss_materialized_view AS+
          |       |   SELECT * FROM generate_series($1, $2) as id
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(2 rows)

-- CREATE MATERIALIZED VIEW, top-level tracking.
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

CREATE MATERIALIZED VIEW pgss_materialized_view_2 AS
  SELECT * FROM generate_series(1, 5) as id;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                        query                         
----------+-------+------------------------------------------------------
 t        |     1 | CREATE MATERIALIZED VIEW pgss_materialized_view_2 AS+
          |       |   SELECT * FROM generate_series($1, $2) as id
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(2 rows)

-- REFRESH MATERIALIZED VIEW, all-level tracking.
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

REFRESH MATERIALIZED VIEW pgss_materialized_view;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                       query                        
----------+-------+----------------------------------------------------
 t        |     1 | REFRESH MATERIALIZED VIEW pgss_materialized_view
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(2 rows)

-- REFRESH MATERIALIZED VIEW, top-level tracking.
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

REFRESH MATERIALIZED VIEW pgss_materialized_view;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                       query                        
----------+-------+----------------------------------------------------
 t        |     1 | REFRESH MATERIALIZED VIEW pgss_materialized_view
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(2 rows)

-- CREATE TABLE AS, all-level tracking.
SET pg_stat_statements.track = 'all';
PREPARE test_prepare_pgss AS select generate_series(1, 10);
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

CREATE TEMPORARY TABLE pgss_ctas_1 AS SELECT 1;
CREATE TEMPORARY TABLE pgss_ctas_2 AS EXECUTE test_prepare_pgss;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                              query                              
----------+-------+-----------------------------------------------------------------
 t        |     1 | CREATE TEMPORARY TABLE pgss_ctas_1 AS SELECT $1
 t        |     1 | CREATE TEMPORARY TABLE pgss_ctas_2 AS EXECUTE test_prepare_pgss
 f        |     1 | SELECT $1
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
 f        |     1 | select generate_series($1, $2)
(5 rows)

-- CREATE TABLE AS, top-level tracking.
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

CREATE TEMPORARY TABLE pgss_ctas_3 AS SELECT 1;
CREATE TEMPORARY TABLE pgss_ctas_4 AS EXECUTE test_prepare_pgss;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                              query                              
----------+-------+-----------------------------------------------------------------
 t        |     1 | CREATE TEMPORARY TABLE pgss_ctas_3 AS SELECT $1
 t        |     1 | CREATE TEMPORARY TABLE pgss_ctas_4 AS EXECUTE test_prepare_pgss
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(3 rows)

-- EXPLAIN with CREATE TABLE AS - all-level tracking.
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

EXPLAIN (COSTS OFF) CREATE TEMPORARY TABLE pgss_explain_ctas AS SELECT 1;
 QUERY PLAN 
------------
 Result
(1 row)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                                   query                                   
----------+-------+---------------------------------------------------------------------------
 t        |     1 | EXPLAIN (COSTS OFF) CREATE TEMPORARY TABLE pgss_explain_ctas AS SELECT $1
 f        |     1 | SELECT $1
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(3 rows)

-- EXPLAIN with CREATE TABLE AS - top-level tracking.
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

EXPLAIN (COSTS OFF) CREATE TEMPORARY TABLE pgss_explain_ctas AS SELECT 1;
 QUERY PLAN 
------------
 Result
(1 row)

SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                                   query                                   
----------+-------+---------------------------------------------------------------------------
 t        |     1 | EXPLAIN (COSTS OFF) CREATE TEMPORARY TABLE pgss_explain_ctas AS SELECT $1
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(2 rows)

-- DECLARE CURSOR, all-level tracking.
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

BEGIN;
DECLARE FOOCUR CURSOR FOR SELECT * from stats_track_tab;
FETCH FORWARD 1 FROM foocur;
 x 
---
(0 rows)

CLOSE foocur;
COMMIT;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                          query                          
----------+-------+---------------------------------------------------------
 t        |     1 | BEGIN
 t        |     1 | CLOSE foocur
 t        |     1 | COMMIT
 t        |     1 | DECLARE FOOCUR CURSOR FOR SELECT * from stats_track_tab
 t        |     1 | FETCH FORWARD 1 FROM foocur
 f        |     1 | SELECT * from stats_track_tab
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(7 rows)

-- DECLARE CURSOR, top-level tracking.
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

BEGIN;
DECLARE FOOCUR CURSOR FOR SELECT * FROM stats_track_tab;
FETCH FORWARD 1 FROM foocur;
 x 
---
(0 rows)

CLOSE foocur;
COMMIT;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                          query                          
----------+-------+---------------------------------------------------------
 t        |     1 | BEGIN
 t        |     1 | CLOSE foocur
 t        |     1 | COMMIT
 t        |     1 | DECLARE FOOCUR CURSOR FOR SELECT * FROM stats_track_tab
 t        |     1 | FETCH FORWARD 1 FROM foocur
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(6 rows)

-- COPY - all-level tracking.
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

COPY (SELECT 1) TO stdout;
1
COPY (SELECT 1 UNION SELECT 2) TO stdout;
1
2
COPY (MERGE INTO stats_track_tab USING (SELECT 1 id) ON x = id
  WHEN MATCHED THEN UPDATE SET x = id
  WHEN NOT MATCHED THEN INSERT (x) VALUES (id) RETURNING x) TO stdout;
1
COPY (INSERT INTO stats_track_tab (x) VALUES (1) RETURNING x) TO stdout;
1
COPY (UPDATE stats_track_tab SET x = 2 WHERE x = 1 RETURNING x) TO stdout;
2
2
COPY (DELETE FROM stats_track_tab WHERE x = 2 RETURNING x) TO stdout;
2
2
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                                   query                                   
----------+-------+---------------------------------------------------------------------------
 t        |     1 | COPY (DELETE FROM stats_track_tab WHERE x = 2 RETURNING x) TO stdout
 t        |     1 | COPY (INSERT INTO stats_track_tab (x) VALUES (1) RETURNING x) TO stdout
 t        |     1 | COPY (MERGE INTO stats_track_tab USING (SELECT 1 id) ON x = id           +
          |       |   WHEN MATCHED THEN UPDATE SET x = id                                    +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id) RETURNING x) TO stdout
 t        |     1 | COPY (SELECT 1 UNION SELECT 2) TO stdout
 t        |     1 | COPY (SELECT 1) TO stdout
 t        |     1 | COPY (UPDATE stats_track_tab SET x = 2 WHERE x = 1 RETURNING x) TO stdout
 f        |     1 | DELETE FROM stats_track_tab WHERE x = $1 RETURNING x
 f        |     1 | INSERT INTO stats_track_tab (x) VALUES ($1) RETURNING x
 f        |     1 | MERGE INTO stats_track_tab USING (SELECT $1 id) ON x = id                +
          |       |   WHEN MATCHED THEN UPDATE SET x = id                                    +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id) RETURNING x
 f        |     1 | SELECT $1
 f        |     1 | SELECT $1 UNION SELECT $2
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
 f        |     1 | UPDATE stats_track_tab SET x = $1 WHERE x = $2 RETURNING x
(13 rows)

-- COPY - top-level tracking.
SET pg_stat_statements.track = 'top';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

COPY (SELECT 1) TO stdout;
1
COPY (SELECT 1 UNION SELECT 2) TO stdout;
1
2
COPY (MERGE INTO stats_track_tab USING (SELECT 1 id) ON x = id
  WHEN MATCHED THEN UPDATE SET x = id
  WHEN NOT MATCHED THEN INSERT (x) VALUES (id) RETURNING x) TO stdout;
1
COPY (INSERT INTO stats_track_tab (x) VALUES (1) RETURNING x) TO stdout;
1
COPY (UPDATE stats_track_tab SET x = 2 WHERE x = 1 RETURNING x) TO stdout;
2
2
COPY (DELETE FROM stats_track_tab WHERE x = 2 RETURNING x) TO stdout;
2
2
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C";
 toplevel | calls |                                   query                                   
----------+-------+---------------------------------------------------------------------------
 t        |     1 | COPY (DELETE FROM stats_track_tab WHERE x = 2 RETURNING x) TO stdout
 t        |     1 | COPY (INSERT INTO stats_track_tab (x) VALUES (1) RETURNING x) TO stdout
 t        |     1 | COPY (MERGE INTO stats_track_tab USING (SELECT 1 id) ON x = id           +
          |       |   WHEN MATCHED THEN UPDATE SET x = id                                    +
          |       |   WHEN NOT MATCHED THEN INSERT (x) VALUES (id) RETURNING x) TO stdout
 t        |     1 | COPY (SELECT 1 UNION SELECT 2) TO stdout
 t        |     1 | COPY (SELECT 1) TO stdout
 t        |     1 | COPY (UPDATE stats_track_tab SET x = 2 WHERE x = 1 RETURNING x) TO stdout
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(7 rows)

-- DO block - top-level tracking without utility.
SET pg_stat_statements.track = 'top';
SET pg_stat_statements.track_utility = FALSE;
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

DELETE FROM stats_track_tab;
DO $$
BEGIN
  DELETE FROM stats_track_tab;
END; $$;
DO LANGUAGE plpgsql $$
BEGIN
  -- this is a SELECT
  PERFORM 'hello world'::TEXT;
END; $$;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C", toplevel;
 toplevel | calls |                       query                        
----------+-------+----------------------------------------------------
 t        |     1 | DELETE FROM stats_track_tab
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(2 rows)

-- DO block - all-level tracking without utility.
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

DELETE FROM stats_track_tab;
DO $$
BEGIN
  DELETE FROM stats_track_tab;
END; $$;
DO LANGUAGE plpgsql $$
BEGIN
  -- this is a SELECT
  PERFORM 'hello world'::TEXT;
END; $$;
SELECT toplevel, calls, query FROM pg_stat_statements
  ORDER BY query COLLATE "C", toplevel;
 toplevel | calls |                       query                        
----------+-------+----------------------------------------------------
 f        |     1 | DELETE FROM stats_track_tab
 t        |     1 | DELETE FROM stats_track_tab
 f        |     1 | SELECT $1::TEXT
 t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(4 rows)

-- PL/pgSQL function - top-level tracking.
SET pg_stat_statements.track = 'top';
SET pg_stat_statements.track_utility = FALSE;
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

CREATE FUNCTION PLUS_TWO(i INTEGER) RETURNS INTEGER AS $$
DECLARE
  r INTEGER;
BEGIN
  SELECT (i + 1 + 1.0)::INTEGER INTO r;
  RETURN r;
END; $$ LANGUAGE plpgsql;
SELECT PLUS_TWO(3);
 plus_two 
----------
        5
(1 row)

SELECT PLUS_TWO(7);
 plus_two 
----------
        9
(1 row)

-- SQL function --- use LIMIT to keep it from being inlined
CREATE FUNCTION PLUS_ONE(i INTEGER) RETURNS INTEGER AS
$$ SELECT (i + 1.0)::INTEGER LIMIT 1 $$ LANGUAGE SQL;
SELECT PLUS_ONE(8);
 plus_one 
----------
        9
(1 row)

SELECT PLUS_ONE(10);
 plus_one 
----------
       11
(1 row)

SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
 calls | rows |                       query                        
-------+------+----------------------------------------------------
     2 |    2 | SELECT PLUS_ONE($1)
     2 |    2 | SELECT PLUS_TWO($1)
     1 |    1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(3 rows)

-- immutable SQL function --- can be executed at plan time
CREATE FUNCTION PLUS_THREE(i INTEGER) RETURNS INTEGER AS
$$ SELECT i + 3 LIMIT 1 $$ IMMUTABLE LANGUAGE SQL;
SELECT PLUS_THREE(8);
 plus_three 
------------
         11
(1 row)

SELECT PLUS_THREE(10);
 plus_three 
------------
         13
(1 row)

SELECT toplevel, calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
 toplevel | calls | rows |                                    query                                     
----------+-------+------+------------------------------------------------------------------------------
 t        |     2 |    2 | SELECT PLUS_ONE($1)
 t        |     2 |    2 | SELECT PLUS_THREE($1)
 t        |     2 |    2 | SELECT PLUS_TWO($1)
 t        |     1 |    3 | SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"
 t        |     1 |    1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(5 rows)

-- PL/pgSQL function - all-level tracking.
SET pg_stat_statements.track = 'all';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

-- we drop and recreate the functions to avoid any caching funnies
DROP FUNCTION PLUS_ONE(INTEGER);
DROP FUNCTION PLUS_TWO(INTEGER);
DROP FUNCTION PLUS_THREE(INTEGER);
-- PL/pgSQL function
CREATE FUNCTION PLUS_TWO(i INTEGER) RETURNS INTEGER AS $$
DECLARE
  r INTEGER;
BEGIN
  SELECT (i + 1 + 1.0)::INTEGER INTO r;
  RETURN r;
END; $$ LANGUAGE plpgsql;
SELECT PLUS_TWO(-1);
 plus_two 
----------
        1
(1 row)

SELECT PLUS_TWO(2);
 plus_two 
----------
        4
(1 row)

-- SQL function --- use LIMIT to keep it from being inlined
CREATE FUNCTION PLUS_ONE(i INTEGER) RETURNS INTEGER AS
$$ SELECT (i + 1.0)::INTEGER LIMIT 1 $$ LANGUAGE SQL;
SELECT PLUS_ONE(3);
 plus_one 
----------
        4
(1 row)

SELECT PLUS_ONE(1);
 plus_one 
----------
        2
(1 row)

SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
 calls | rows |                       query                        
-------+------+----------------------------------------------------
     2 |    2 | SELECT (i + $2 + $3)::INTEGER
     2 |    2 | SELECT (i + $2)::INTEGER LIMIT $3
     2 |    2 | SELECT PLUS_ONE($1)
     2 |    2 | SELECT PLUS_TWO($1)
     1 |    1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(5 rows)

-- immutable SQL function --- can be executed at plan time
CREATE FUNCTION PLUS_THREE(i INTEGER) RETURNS INTEGER AS
$$ SELECT i + 3 LIMIT 1 $$ IMMUTABLE LANGUAGE SQL;
SELECT PLUS_THREE(8);
 plus_three 
------------
         11
(1 row)

SELECT PLUS_THREE(10);
 plus_three 
------------
         13
(1 row)

SELECT toplevel, calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
 toplevel | calls | rows |                                    query                                     
----------+-------+------+------------------------------------------------------------------------------
 f        |     2 |    2 | SELECT (i + $2 + $3)::INTEGER
 f        |     2 |    2 | SELECT (i + $2)::INTEGER LIMIT $3
 t        |     2 |    2 | SELECT PLUS_ONE($1)
 t        |     2 |    2 | SELECT PLUS_THREE($1)
 t        |     2 |    2 | SELECT PLUS_TWO($1)
 t        |     1 |    5 | SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C"
 f        |     2 |    2 | SELECT i + $2 LIMIT $3
 t        |     1 |    1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(8 rows)

--
-- pg_stat_statements.track = none
--
SET pg_stat_statements.track = 'none';
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)

SELECT 1 AS "one";
 one 
-----
   1
(1 row)

SELECT 1 + 1 AS "two";
 two 
-----
   2
(1 row)

SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
 calls | rows | query 
-------+------+-------
(0 rows)

SELECT pg_stat_statements_reset() IS NOT NULL AS t;
 t 
---
 t
(1 row)