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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 19
CREATE EXTENSION
| key | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BOL-Course | 12.00 | null | 12.00 | null | null | null | null | null | null | null | null | null |
| COL-Course | null | null | null | 24.00 | null | null | null | null | null | null | null | null |
| COL-Subscription | 30.00 | null | null | null | null | 30.00 | null | null | null | null | null | 30.00 |
| MXN-Course | null | null | null | null | 16.00 | null | null | null | null | null | null | null |
| PEN-Course | 16.00 | 12.00 | 24.00 | null | null | null | 16.00 | null | 16.00 | null | null | 12.00 |
| PEN-Subscription | null | null | null | 30.00 | 30.00 | 30.00 | null | 30.00 | null | 30.00 | 30.00 | null |
SELECT 6
| country | type | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BOL | Course | 12.00 | null | 12.00 | null | null | null | null | null | null | null | null | null |
| COL | Course | null | null | null | 24.00 | null | null | null | null | null | null | null | null |
| COL | Subscription | 30.00 | null | null | null | null | 30.00 | null | null | null | null | null | 30.00 |
| MXN | Course | null | null | null | null | 16.00 | null | null | null | null | null | null | null |
| PEN | Course | 16.00 | 12.00 | 24.00 | null | null | null | 16.00 | null | 16.00 | null | null | 12.00 |
| PEN | Subscription | null | null | null | 30.00 | 30.00 | 30.00 | null | 30.00 | null | 30.00 | 30.00 | null |
SELECT 6