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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?.
8 rows affected
| country_id | city_id | person_id |
|---|---|---|
| 123 | 45 | 100334 |
| 123 | 45 | 3460456 |
| 123 | 45 | 943875 |
| 123 | 121 | 4362 |
| 123 | 121 | 124747 |
| 146 | 87 | 3457320 |
| 146 | 89 | 3495879 |
| 146 | 89 | 34703924 |
| country_id | city_id | person_id | dense_rank | dense_rank |
|---|---|---|---|---|
| 123 | 45 | 100334 | 1 | 1 |
| 123 | 45 | 3460456 | 1 | 1 |
| 123 | 45 | 943875 | 1 | 1 |
| 123 | 121 | 4362 | 1 | 2 |
| 123 | 121 | 124747 | 1 | 2 |
| 146 | 87 | 3457320 | 2 | 1 |
| 146 | 89 | 3495879 | 2 | 2 |
| 146 | 89 | 34703924 | 2 | 2 |