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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?.
5 rows affected
| id_user | date | promo_id | max |
|---|---|---|---|
| 1 | 2017-06-20 | N | 2017-04-20 |
| 1 | 2017-05-20 | N | 2017-04-20 |
| 1 | 2017-04-20 | Y | 2017-03-20 |
| 1 | 2017-03-20 | Y | null |
| 1 | 2017-02-20 | N | null |