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?.
| js | ar | res |
|---|---|---|
| {"a": 1, "b": 2, "c": 3} | {a,b,c} | t |
| {"a": 1, "b": 2, "z": 3} | {a,b} | f |