CREATE OR REPLACE FUNCTION pstat.pg_stat_statements_insert_trigger() RETURNS trigger AS
$$
BEGIN
  INSERT INTO pstat.sql_base_set ( id ) VALUES ( 1 );
  RAISE EXCEPTION '***TEST***' ;
  RETURN NULL;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER pg_stat_statements_insert_trigger ON pg_stat_statements ; 

CREATE TRIGGER pg_stat_statements_insert_trigger
INSTEAD OF INSERT OR UPDATE ON pg_stat_statements
FOR EACH ROW EXECUTE PROCEDURE pstat.pg_stat_statements_insert_trigger();

postgres=# select pg_stat_statements_reset() ; 
 pg_stat_statements_reset 
--------------------------
 
(1 row)

postgres=# select count(*) from wafer_data ;
  count  
---------
 2000002
(1 row)

postgres=# \g  
  count  
---------
 2000002
(1 row)

postgres=# select count(*) from pg_stat_statements ;
 count 
-------
     2
(1 row)

postgres=# select count(*) from shipment ;
 count 
-------
  2000
(1 row)

postgres=# select count(*) from pg_stat_statements ;
 count 
-------
     4
(1 row)

postgres=# select * from pstat.sql_base_set ; 
 id | mean_time | max_time | plan 
----+-----------+----------+------
(0 rows)