BUG #17552: pg_stat_statements tracks internal FK check queries when COPY used to load data

The following bug has been logged on the website:

Bug reference: 17552
Logged by: Maxim Boguk
Email address: maxim(dot)boguk(at)gmail(dot)com
PostgreSQL version: 14.4
Operating system: Linux
Description:

pg_stat_statements track internal FK trigger check queries during data load
via COPY
( pg_stat_statements.track=top (default) and
pg_stat_statements.track_utility=off (not default) )
Tested on latest 13 and 14 versions.

Test script (test.sql):

drop table if exists t1 CASCADE;
drop table if exists t2;

create table t1 (id integer primary key);
insert into t1 values (1);
vacuum ANALYZE t1;

create table t2 (id integer primary key, fk integer references t1(id));

create extension IF NOT EXISTS pg_stat_statements;
select e.extname AS "Name", e.extversion AS "Version" FROM
pg_catalog.pg_extension e where e.extname='pg_stat_statements';
show pg_stat_statements.track;
show pg_stat_statements.track_utility;

select pg_stat_statements_reset();

COPY public.t2 (id, fk) FROM stdin;
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 1
10 1
11 1
12 1
13 1
14 1
15 1
16 1
17 1
18 1
19 1
20 1
21 1
22 1
23 1
24 1
25 1
26 1
27 1
28 1
29 1
30 1
31 1
32 1
33 1
34 1
35 1
36 1
37 1
38 1
39 1
40 1
41 1
42 1
43 1
44 1
45 1
46 1
47 1
48 1
49 1
50 1
51 1
52 1
53 1
54 1
55 1
56 1
57 1
58 1
59 1
60 1
61 1
62 1
63 1
64 1
65 1
66 1
67 1
68 1
69 1
70 1
71 1
72 1
73 1
74 1
75 1
76 1
77 1
78 1
79 1
80 1
81 1
82 1
83 1
84 1
85 1
86 1
87 1
88 1
89 1
90 1
91 1
92 1
93 1
94 1
95 1
96 1
97 1
98 1
99 1
100 1
\.

select query, calls from public.pg_stat_statements where dbid=(select oid
from pg_database where datname=current_database()) order by calls desc limit
2;

run:
psql -e -f test.sql -d sometestdb

Final output rows:
select query, calls from public.pg_stat_statements where dbid=(select oid
from pg_database where datname=current_database()) order by calls desc limit
2;
query
| calls
---------------------------------------------------------------------------------------------+-------
SELECT $2 FROM ONLY "public"."t1" x WHERE "id" OPERATOR(pg_catalog.=) $1
FOR KEY SHARE OF x | 100
select pg_stat_statements_reset()
| 1
(2 rows)

Expected output:
query
| calls
---------------------------------------------------------------------------------------------+-------
select pg_stat_statements_reset()
| 1
(1 rows)

PS: with pg_stat_statements.track_utility=on test work as expected and
provides expected
select query, calls from public.pg_stat_statements where dbid=(select oid
from pg_database where datname=current_database()) order by calls desc limit
2;
query | calls
------------------------------------+-------
COPY public.t2 (id, fk) FROM stdin | 1
select pg_stat_statements_reset() | 1

Regards,
Maxim