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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?.
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| dates | country | revenue |
|---|---|---|
| 2020-01-01 00:00:00+00 | US | 30 |
| 2020-01-02 00:00:00+00 | US | 30 |
| 2020-01-03 00:00:00+00 | US | 30 |
| 2020-01-04 00:00:00+00 | US | 30 |
| 2020-01-05 00:00:00+00 | US | 180 |
| 2020-01-01 00:00:00+00 | UK | 22.5 |
| 2020-01-02 00:00:00+00 | UK | 22.5 |
| 2020-01-03 00:00:00+00 | UK | 22.5 |
| 2020-01-04 00:00:00+00 | UK | 22.5 |
| 2020-01-05 00:00:00+00 | UK | 45 |
| 2020-01-01 00:00:00+00 | IT | 20 |
| 2020-01-02 00:00:00+00 | IT | 20 |
| 2020-01-03 00:00:00+00 | IT | 20 |
| 2020-01-04 00:00:00+00 | IT | 27 |