By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.
DROP TABLE
CREATE TABLE
INSERT 0 1
| top_level | send_level | value |
|---|---|---|
| 2 | 8 | completed |
| 2 | 9 | completed |
| 2 | 10 | completed |
| 5 | 40 | completed |
SELECT 4