Postgres 11

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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 t1 (id int, name text);
INSERT INTO t1 VALUES
(1, '1111'),(2, '2222'),(3, '3333');
3 rows affected

SELECT id, name INTO t2 FROM t1;
3 rows affected

SELECT id, name FROM t2;


id
name


1
1111

2
2222

3
3333


CREATE TABLE t3 (id int, name text);
SELECT id, name INTO t3 FROM t1;
ERROR:  relation "t3" already exists


INSERT INTO t4
SELECT id, name FROM t1;
ERROR:  relation "t4" does not exist
LINE 1: INSERT INTO t4
                    ^


INSERT INTO t3
SELECT id, name FROM t1;
3 rows affected

SELECT * FROM t3;


id
name


1
1111

2
2222

3
3333