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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?.
CREATE TABLE
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INSERT 0 1
| User | Timestamp | Event | Trip Nr |
|---|---|---|---|
| 1 | 2022-06-30 01:18:03+01 | Walking | 2 |
| 1 | 2022-06-30 01:18:02+01 | Walking | 2 |
| 1 | 2022-06-30 01:18:01+01 | Start | 2 |
| 1 | 2022-06-29 03:21:03+01 | Walking | 1 |
| 1 | 2022-06-29 03:21:02+01 | Walking | 1 |
| 1 | 2022-06-29 03:21:01+01 | Start | 1 |
| 2 | 2022-06-28 01:36:03+01 | Walking | 4 |
| 2 | 2022-06-28 01:36:02+01 | Walking | 4 |
| 2 | 2022-06-28 01:36:01+01 | Start | 4 |
| 2 | 2022-06-28 00:55:03+01 | Walking | 3 |
| 2 | 2022-06-28 00:55:02+01 | Walking | 3 |
| 2 | 2022-06-28 00:55:01+01 | Start | 3 |
SELECT 12