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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?.
DROP TABLE
CREATE TABLE
INSERT 0 1
DROP TABLE
CREATE TABLE
INSERT 0 1
DROP TABLE
CREATE TABLE
INSERT 0 1
DROP TABLE
CREATE TABLE
INSERT 0 4
class_id | order_id | family_id | species_id |
---|---|---|---|
1 | 1 | 1 | 1 |
1 | 1 | 1 | 2 |
1 | 1 | 1 | 3 |
1 | 1 | 1 | 4 |
SELECT 4
jsonb_pretty |
---|
[ { "id": 1, "class": "Class A", "orders": [ { "id": 1, "order": "Order 1", "families": [ { "id": 1, "family": "Family 1", "species": [ { "id": 1, "species": "Species 1" }, { "id": 2, "species": "Species 2" }, { "id": 3, "species": "Species 3" }, { "id": 4, "species": "Species 4" } ] } ] } ] } ] |
SELECT 1