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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?.
| user_id | flag | updated_at | prev_flag | most_recent_updated_at |
|---|---|---|---|---|
| 123 | 1 | 101 | null | 101 |
| 123 | 0 | 102 | 1 | 102 |
| 123 | 1 | 103 | 0 | 103 |
| 123 | 1 | 104 | 1 | 103 |
| 123 | 1 | 105 | 1 | 103 |
| 124 | 0 | 101 | null | 101 |
| 124 | 0 | 103 | 0 | 101 |
| 124 | 0 | 110 | 0 | 101 |
SELECT 8