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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 | year |
|---|---|
| 01 | 2016 |
| 01 | 2017 |
| 02 | 2017 |
| 02 | 2018 |
| 03 | 2015 |
| 03 | 2016 |
| 03 | 2017 |
| 03 | 2018 |
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| 05 | 2014 |
| 05 | 2015 |
| 05 | 2016 |
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| 05 | 2018 |