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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?.
4 rows affected
| first | second | data |
|---|---|---|
| 1 | 2 | test |
| 1 | 3 | testing |
| 1 | 2 | testing |
| 2 | 2 | testing |
ERROR: duplicate key value violates unique constraint "test1_pkey"
DETAIL: Key (first, second)=(1, 2) already exists.