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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?.
| id | invdate | invoiced | sum |
|---|---|---|---|
| AAA | 2023-03 | 1 | 40 |
| AAA | 2023-06 | 1 | 30 |
| BBB | 2022-06 | 1 | 60 |
| BBB | 2022-08 | 1 | 60 |
SELECT 4