Postgres 14

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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.

CREATE TABLE student 
(
    STUDENT_ID    serial primary key
);
insert into student values 
(100001),
(100002),
(100003),
(100004),
(100005),
(100006);
6 rows affected

select * from student;


student_id


100001

100002

100003

100004

100005

100006


alter table student add column NEW_STUDENT_ID   serial;
select * from student;


student_id
new_student_id


100001
1

100002
2

100003
3

100004
4

100005
5

100006
6