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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
specimen | day | period | area | mov |
---|---|---|---|---|
1 | 1 | 1 | 1 | 0 |
1 | 1 | 2 | 1 | 0 |
1 | 1 | 3 | 2 | 1 |
1 | 1 | 4 | 2 | 1 |
1 | 1 | 5 | 3 | 2 |
1 | 1 | 6 | 2 | 3 |
1 | 2 | 1 | 2 | 0 |
1 | 2 | 2 | 1 | 1 |
1 | 2 | 3 | 2 | 2 |
1 | 2 | 4 | 3 | 3 |
1 | 2 | 5 | 2 | 4 |
1 | 2 | 6 | 1 | 5 |
2 | 1 | 1 | 3 | 0 |
2 | 1 | 2 | 3 | 0 |
2 | 1 | 3 | 1 | 1 |
SELECT 15
specimen | day | period | area | count |
---|---|---|---|---|
1 | 1 | 1 | 1 | 0 |
1 | 1 | 2 | 1 | 0 |
1 | 1 | 3 | 2 | 1 |
1 | 1 | 4 | 2 | 1 |
1 | 1 | 5 | 3 | 2 |
1 | 1 | 6 | 2 | 3 |
1 | 2 | 1 | 2 | 0 |
1 | 2 | 2 | 1 | 1 |
1 | 2 | 3 | 2 | 2 |
1 | 2 | 4 | 3 | 3 |
1 | 2 | 5 | 2 | 4 |
1 | 2 | 6 | 1 | 5 |
2 | 1 | 1 | 3 | 0 |
2 | 1 | 2 | 3 | 0 |
2 | 1 | 3 | 1 | 1 |
SELECT 15