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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?.
| version |
|---|
| PostgreSQL 14.4 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), 64-bit |
| student | category | exam_id | adjusted_category |
|---|---|---|---|
| Carl | A | 44 | A |
| Carl | A | 55 | A |
| Carl | A | 88 | A |
| Carl | A | 1 | A |
| Carl | A | 2 | A |
| Carl | A | 3 | A |
| Carl | B | 1 | A |
| Carl | B | 2 | A |
| Carl | B | 3 | A |
| John | C | 100 | C |
| John | C | 200 | C |
| John | C | 300 | C |