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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?.
3 rows affected
4 rows affected
3 rows affected
| id | val | val |
|---|---|---|
| A | 4 | 7 |
| B | 5 | 8 |
| B | 6 | 8 |
| C | 7 | 9 |