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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 15.0 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), 64-bit |
SELECT 1
| id_1 | name1 | id_2 | name2 | count |
|---|---|---|---|---|
| 2 | Maria | 5 | Tom | 6 |
| 2 | Maria | 7 | Adam | 3 |
| 5 | Tom | 2 | Maria | 6 |
| 5 | Tom | 10 | Isabel | 4 |
| 5 | Tom | 35 | Bob | 1 |
| 7 | Adam | 2 | Maria | 3 |
| 7 | Adam | 35 | Bob | 5 |
| 7 | Adam | 72 | Charlie | 2 |
| 10 | Isabel | 5 | Tom | 4 |
| 35 | Bob | 5 | Tom | 1 |
| 35 | Bob | 7 | Adam | 5 |
| 72 | Charlie | 7 | Adam | 2 |
SELECT 12