CREATE EXTENSION pg_stat_monitor;
CREATE DATABASE db1;
CREATE DATABASE db2;
\c db1
CREATE TABLE t1 (a int);
CREATE TABLE t2 (b int);
CREATE FUNCTION add(integer, integer) RETURNS integer
    AS 'select $1 + $2;'
    LANGUAGE SQL
    IMMUTABLE
    RETURNS NULL ON NULL INPUT;
\c db2
CREATE TABLE t1 (a int);
CREATE TABLE t3 (c int);
CREATE FUNCTION add(integer, integer) RETURNS integer
    AS 'select $1 + $2;'
    LANGUAGE SQL
    IMMUTABLE
    RETURNS NULL ON NULL INPUT;
\c contrib_regression
SELECT pg_stat_monitor_reset();
 pg_stat_monitor_reset 
-----------------------
 
(1 row)

\c db1
SELECT * FROM t1;
 a 
---
(0 rows)

SELECT *, ADD(1, 2) FROM t1;
 a | add 
---+-----
(0 rows)

SELECT * FROM t2;
 b 
---
(0 rows)

-- Check that spaces and comments do not generate a different pgsm_query_id
SELECT     *     FROM t2 --WHATEVER;
;
 b 
---
(0 rows)

SELECT     *     FROM t2 /* ...
...
More comments to check for spaces.
*/
     ;
 b 
---
(0 rows)

\c db2
SELECT * FROM t1;
 a 
---
(0 rows)

SELECT *, ADD(1, 2) FROM t1;
 a | add 
---+-----
(0 rows)

set pg_stat_monitor.pgsm_enable_pgsm_query_id = off;
SELECT * FROM t3;
 c 
---
(0 rows)

set pg_stat_monitor.pgsm_enable_pgsm_query_id = on;
SELECT * FROM t3 where c = 20;
 c 
---
(0 rows)

\c contrib_regression
SELECT datname, pgsm_query_id, query, calls FROM pg_stat_monitor ORDER BY pgsm_query_id, query, datname;
      datname       |    pgsm_query_id    |                        query                        | calls 
--------------------+---------------------+-----------------------------------------------------+-------
 contrib_regression |  689150021118383254 | SELECT pg_stat_monitor_reset()                      |     1
 db1                | 1897482803466821995 | SELECT * FROM t2                                    |     3
 db1                | 1988437669671417938 | SELECT * FROM t1                                    |     1
 db2                | 1988437669671417938 | SELECT * FROM t1                                    |     1
 db1                | 2864453209316739369 | select $1 + $2                                      |     1
 db2                | 2864453209316739369 | select $1 + $2                                      |     1
 db2                | 6220142855706866455 | set pg_stat_monitor.pgsm_enable_pgsm_query_id = on  |     1
 db2                | 6633979598391393345 | SELECT * FROM t3 where c = 20                       |     1
 db1                | 8140395000078788481 | SELECT *, ADD(1, 2) FROM t1                         |     1
 db2                | 8140395000078788481 | SELECT *, ADD(1, 2) FROM t1                         |     1
 db2                |                     | SELECT * FROM t3                                    |     1
 db2                |                     | set pg_stat_monitor.pgsm_enable_pgsm_query_id = off |     1
(12 rows)

SELECT pg_stat_monitor_reset();
 pg_stat_monitor_reset 
-----------------------
 
(1 row)

\c db1
DROP TABLE t1;
DROP TABLE t2;
DROP FUNCTION ADD;
\c db2
DROP TABLE t1;
DROP TABLE t3;
DROP FUNCTION ADD;
\c contrib_regression
DROP DATABASE db1;
DROP DATABASE db2;
DROP EXTENSION pg_stat_monitor;