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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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| id | food | grp |
|---|---|---|
| 1 | banana | 1 |
| 2 | banana | 1 |
| 3 | egg | 2 |
| 4 | egg | 2 |
| 5 | banana | 3 |
| 6 | egg | 4 |
| 7 | egg | 4 |