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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 | arr_values | arr_pk_id |
|---|---|---|
| 1 | {A,B,C} | {1,2,3} |
| 1 | {A,B,E} | {1,2,5} |
| 1 | {A,B,G} | {1,2,7} |
| 1 | {A,F,C} | {1,6,3} |
| 1 | {A,F,E} | {1,6,5} |
| 1 | {A,F,G} | {1,6,7} |
| 1 | {D,B,C} | {4,2,3} |
| 1 | {D,B,E} | {4,2,5} |
| 1 | {D,B,G} | {4,2,7} |
| 1 | {D,F,C} | {4,6,3} |
| 1 | {D,F,E} | {4,6,5} |
| 1 | {D,F,G} | {4,6,7} |
| 2 | {H,I} | {8,9} |
| 2 | {J,I} | {10,9} |