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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
| date |
|---|
| 2024-01-01 |
| 2024-01-02 |
| 2024-01-03 |
| 2024-01-04 |
| 2024-01-05 |
| 2024-01-06 |
INSERT 0 6
CREATE TABLE
| business_date | id |
|---|---|
| 2024-01-01 | 1 |
| 2024-01-02 | 2 |
| 2024-01-05 | 4 |
| 2024-01-06 | 5 |
INSERT 0 4
| date | business_date | id |
|---|---|---|
| 2024-01-01 | 2024-01-01 | 1 |
| 2024-01-02 | 2024-01-02 | 2 |
| 2024-01-03 | 2024-01-02 | 2 |
| 2024-01-04 | 2024-01-02 | 2 |
| 2024-01-05 | 2024-01-05 | 4 |
| 2024-01-06 | 2024-01-06 | 5 |
SELECT 6
| business_date | id | next_business_date | date |
|---|---|---|---|
| 2024-01-01 | 1 | 2024-01-02 | 2024-01-01 |
| 2024-01-02 | 2 | 2024-01-05 | 2024-01-02 |
| 2024-01-02 | 2 | 2024-01-05 | 2024-01-03 |
| 2024-01-02 | 2 | 2024-01-05 | 2024-01-04 |
| 2024-01-05 | 4 | 2024-01-06 | 2024-01-05 |
| 2024-01-06 | 5 | 9999-12-31 | 2024-01-06 |
SELECT 6