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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?.
| running_month | year | month |
|---|---|---|
| 1 | 2012 | 4 |
| 2 | 2012 | 5 |
| 3 | 2012 | 6 |
| 4 | 2012 | 7 |
| 5 | 2012 | 8 |
| 6 | 2012 | 9 |
| 7 | 2012 | 10 |
| 8 | 2012 | 11 |
| 9 | 2012 | 12 |
| 10 | 2013 | 1 |
| 11 | 2013 | 2 |
| 12 | 2013 | 3 |
| 13 | 2013 | 4 |
| 14 | 2013 | 5 |
| 15 | 2013 | 6 |
| 16 | 2013 | 7 |
| 17 | 2013 | 8 |
| 18 | 2013 | 9 |
| 19 | 2013 | 10 |
| 20 | 2013 | 11 |
| 21 | 2013 | 12 |
| 22 | 2014 | 1 |
| 23 | 2014 | 2 |
| 24 | 2014 | 3 |
| 25 | 2014 | 4 |
| 26 | 2014 | 5 |
| 27 | 2014 | 6 |
| 28 | 2014 | 7 |
| 29 | 2014 | 8 |
| 30 | 2014 | 9 |
| 31 | 2014 | 10 |
| 32 | 2014 | 11 |
| 33 | 2014 | 12 |
| 34 | 2015 | 1 |
| 35 | 2015 | 2 |
| 36 | 2015 | 3 |
| 37 | 2015 | 4 |
| 38 | 2015 | 5 |
| 39 | 2015 | 6 |
| 40 | 2015 | 7 |
| 41 | 2015 | 8 |
| 42 | 2015 | 9 |
| 43 | 2015 | 10 |
| 44 | 2015 | 11 |
| 45 | 2015 | 12 |
| 46 | 2016 | 1 |
SELECT 46