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?.
CREATE TABLE
INSERT 0 2
| mycolumn |
|---|
| {a1,a2} |
| {b1,b2} |
SELECT 2
| first_value | second_value |
|---|---|
| a1 | a2 |
| b1 | b2 |
SELECT 2