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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 | key | category | avg_time_1 | avg_time_2 |
|---|---|---|---|---|
| 1 | 1 | 10 | 10 | 20 |
| 2 | 1 | 20 | 30 | 40 |
| 3 | 2 | 10 | 10 | 50 |
| 4 | 2 | 20 | 60 | 70 |
SELECT 4
| key | avg_time_1 | avg_time_2 |
|---|---|---|
| 1 | [{"avg_time": 10, "category": 10}, {"avg_time": 30, "category": 20}] | [{"avg_time": 20, "category": 10}, {"avg_time": 40, "category": 20}] |
| 2 | [{"avg_time": 10, "category": 10}, {"avg_time": 60, "category": 20}] | [{"avg_time": 50, "category": 10}, {"avg_time": 70, "category": 20}] |
SELECT 2