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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?.
| version |
|---|
| PostgreSQL 15.0 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), 64-bit |
SELECT 1
| type | dates | user_id |
|---|---|---|
| WORK | 2022-06-02 | 74042 |
| WORK | 2022-06-02 | 88357 |
| WORK | 2022-06-02 | 83902 |
| WORK | 2022-06-02 | 88348 |
| WORK | 2022-06-03 | 74042 |
| WORK | 2022-06-03 | 88357 |
| WORK | 2022-06-03 | 83902 |
| WORK | 2022-06-03 | 88348 |
| LEAVE | 2022-05-16 | 83902 |
| LEAVE | 2022-05-16 | 74042 |
| LEAVE | 2022-05-16 | 88357 |
| LEAVE | 2022-05-16 | 88348 |
| LEAVE | 2022-05-26 | 83902 |
| LEAVE | 2022-05-26 | 74042 |
| LEAVE | 2022-05-26 | 88357 |
| LEAVE | 2022-05-26 | 88348 |
SELECT 16