--
-- statement timestamps
--
-- planning time is needed during tests
SET pg_stat_statements.track_planning = TRUE;
SELECT 1 AS "STMTTS1";
 STMTTS1 
---------
       1
(1 row)

SELECT now() AS ref_ts \gset
SELECT 1,2 AS "STMTTS2";
 ?column? | STMTTS2 
----------+---------
        1 |       2
(1 row)

SELECT stats_since >= :'ref_ts', count(*) FROM pg_stat_statements
WHERE query LIKE '%STMTTS%'
GROUP BY stats_since >= :'ref_ts'
ORDER BY stats_since >= :'ref_ts';
 ?column? | count 
----------+-------
 f        |     1
 t        |     1
(2 rows)

SELECT now() AS ref_ts \gset
SELECT
  count(*) as total,
  count(*) FILTER (
    WHERE min_plan_time + max_plan_time = 0
  ) as minmax_plan_zero,
  count(*) FILTER (
    WHERE min_exec_time + max_exec_time = 0
  ) as minmax_exec_zero,
  count(*) FILTER (
    WHERE minmax_stats_since >= :'ref_ts'
  ) as minmax_stats_since_after_ref,
  count(*) FILTER (
    WHERE stats_since >= :'ref_ts'
  ) as stats_since_after_ref
FROM pg_stat_statements
WHERE query LIKE '%STMTTS%';
 total | minmax_plan_zero | minmax_exec_zero | minmax_stats_since_after_ref | stats_since_after_ref 
-------+------------------+------------------+------------------------------+-----------------------
     2 |                0 |                0 |                            0 |                     0
(1 row)

-- Perform single min/max reset
SELECT pg_stat_statements_reset(0, 0, queryid, true) AS minmax_reset_ts
FROM pg_stat_statements
WHERE query LIKE '%STMTTS1%' \gset
-- check
SELECT
  count(*) as total,
  count(*) FILTER (
    WHERE min_plan_time + max_plan_time = 0
  ) as minmax_plan_zero,
  count(*) FILTER (
    WHERE min_exec_time + max_exec_time = 0
  ) as minmax_exec_zero,
  count(*) FILTER (
    WHERE minmax_stats_since >= :'ref_ts'
  ) as minmax_stats_since_after_ref,
  count(*) FILTER (
    WHERE stats_since >= :'ref_ts'
  ) as stats_since_after_ref
FROM pg_stat_statements
WHERE query LIKE '%STMTTS%';
 total | minmax_plan_zero | minmax_exec_zero | minmax_stats_since_after_ref | stats_since_after_ref 
-------+------------------+------------------+------------------------------+-----------------------
     2 |                1 |                1 |                            1 |                     0
(1 row)

-- check minmax reset timestamps
SELECT
query, minmax_stats_since = :'minmax_reset_ts' AS reset_ts_match
FROM pg_stat_statements
WHERE query LIKE '%STMTTS%'
ORDER BY query COLLATE "C";
           query           | reset_ts_match 
---------------------------+----------------
 SELECT $1 AS "STMTTS1"    | t
 SELECT $1,$2 AS "STMTTS2" | f
(2 rows)

-- check that minmax reset does not set stats_reset
SELECT
stats_reset = :'minmax_reset_ts' AS stats_reset_ts_match
FROM pg_stat_statements_info;
 stats_reset_ts_match 
----------------------
 f
(1 row)

-- Perform common min/max reset
SELECT pg_stat_statements_reset(0, 0, 0, true) AS minmax_reset_ts \gset
-- check again
SELECT
  count(*) as total,
  count(*) FILTER (
    WHERE min_plan_time + max_plan_time = 0
  ) as minmax_plan_zero,
  count(*) FILTER (
    WHERE min_exec_time + max_exec_time = 0
  ) as minmax_exec_zero,
  count(*) FILTER (
    WHERE minmax_stats_since >= :'ref_ts'
  ) as minmax_ts_after_ref,
  count(*) FILTER (
    WHERE minmax_stats_since = :'minmax_reset_ts'
  ) as minmax_ts_match,
  count(*) FILTER (
    WHERE stats_since >= :'ref_ts'
  ) as stats_since_after_ref
FROM pg_stat_statements
WHERE query LIKE '%STMTTS%';
 total | minmax_plan_zero | minmax_exec_zero | minmax_ts_after_ref | minmax_ts_match | stats_since_after_ref 
-------+------------------+------------------+---------------------+-----------------+-----------------------
     2 |                2 |                2 |                   2 |               2 |                     0
(1 row)

-- Execute first query once more to check stats update
SELECT 1 AS "STMTTS1";
 STMTTS1 
---------
       1
(1 row)

-- check
-- we don't check planing times here to be independent of
-- plan caching approach
SELECT
  count(*) as total,
  count(*) FILTER (
    WHERE min_exec_time + max_exec_time = 0
  ) as minmax_exec_zero,
  count(*) FILTER (
    WHERE minmax_stats_since >= :'ref_ts'
  ) as minmax_ts_after_ref,
  count(*) FILTER (
    WHERE stats_since >= :'ref_ts'
  ) as stats_since_after_ref
FROM pg_stat_statements
WHERE query LIKE '%STMTTS%';
 total | minmax_exec_zero | minmax_ts_after_ref | stats_since_after_ref 
-------+------------------+---------------------+-----------------------
     2 |                1 |                   2 |                     0
(1 row)

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