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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
INSERT 0 15
| user_id | beg_period | end_period | def_ending |
|---|---|---|---|
| 159 | 2023-01-01 | 2023-01-30 | X |
| 414 | 2022-07-01 | 2022-09-30 | |
| 480 | 2022-09-02 | 2022-11-01 | X |
| 503 | 2022-07-19 | 2022-07-23 |
SELECT 4
| user_id | beg_period | end_period | def_ending | grp | rn |
|---|---|---|---|---|---|
| 159 | 2023-01-01 | 2023-01-30 | X | 1 | 1 |
| 414 | 2022-07-01 | 2022-09-30 | 1 | 1 | |
| 480 | 2022-09-02 | 2022-11-01 | X | 1 | 1 |
| 503 | 2022-07-19 | 2022-07-23 | 1 | 1 |
SELECT 4